CN113809623A - Continuous pulse composite mode high-power all-fiber laser system - Google Patents
Continuous pulse composite mode high-power all-fiber laser system Download PDFInfo
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
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Abstract
The invention discloses a continuous pulse compound mode high-power all-fiber laser system, which belongs to the field of fiber lasers and comprises an electric control module, a high-power continuous fiber laser module group, a high-power pulse fiber laser module group, an all-fiber laser beam combining module and a laser output head; the electric control module is respectively connected with the high-power continuous optical fiber laser module group and the high-power pulse optical fiber laser module group, the output ends of the high-power continuous optical fiber laser module group and the high-power pulse optical fiber laser module group are jointly connected to the all-fiber laser beam combiner module, and the all-fiber laser beam combiner module is connected with the laser output head; the invention realizes the full fiber laser in a high-power continuous pulse compound mode, can realize the output of only continuous laser or only pulse laser, can also realize the simultaneous output of the continuous laser and the pulse laser, and can adjust the power ratio of the continuous laser to the pulse laser. The laser can be used in the high-end laser manufacturing field such as high-efficiency laser cleaning.
Description
Technical Field
The invention belongs to the field of fiber lasers, and particularly relates to a continuous pulse composite mode high-power all-fiber laser system.
Background
The fiber laser is gradually developed into a new-generation advanced laser intelligent manufacturing fiber laser by virtue of the excellent characteristics of high output power, excellent beam quality, simple heat management, easy maintenance, flexible transmission and the like, and is widely applied to the laser manufacturing fields of laser cutting, laser welding, laser cladding, laser cleaning and the like.
The optical fiber laser is divided into a continuous optical fiber laser and a pulse optical fiber laser: the continuous fiber laser continuously emits light in a time domain in a light emitting state, and the pulse fiber laser periodically emits light in a laser pulse mode in the time domain in the light emitting state. High-power continuous fiber lasers are generally used in the laser manufacturing fields of laser cutting, laser welding, laser cladding, laser 3D printing and the like. The high-power pulse optical fiber laser is generally used in the field of laser cleaning, and the high-power and high-energy-density pulse laser beam acts on the surface of a workpiece to cause dirt, oxide or a coating on the surface to be instantaneously evaporated and gasified or separated by thermal expansion, so that the surface cleaning and purification are realized.
In some laser processing processes, if continuous laser and pulse laser are applied to a workpiece at the same time, a more excellent processing effect is produced. For example, patent No. ZL202010186590.7 discloses a complex laser cleaning system, in which a continuous laser and a pulse laser are used, and a cleaning head and a galvanometer system are provided for each of the two lasers, which is complicated.
Therefore, the people in the field are working on developing a full-fiber laser which can simultaneously output continuous laser and pulse laser and can be used as a laser source in the laser manufacturing field such as laser composite cleaning.
Disclosure of Invention
The invention aims to provide a continuous pulse compound mode high-power all-fiber laser system, wherein the output laser consists of continuous laser and pulse laser, the whole laser system realizes full fiber, only continuous laser or only pulse laser can be output, the continuous laser and the pulse laser can be output simultaneously, the power ratio of the continuous laser and the pulse laser can be adjusted, and the output of point annular laser beam consisting of central beam and peripheral annular beam can be realized by using a fiber laser beam combiner with adjustable beam shape, and the beam shape can be adjusted.
In order to solve the technical problems, the invention adopts the following technical scheme:
a continuous pulse compound mode high-power all-fiber laser system comprises an electric control module, a high-power continuous fiber laser module group, a high-power pulse fiber laser module group, an all-fiber laser beam combination module and a laser output head; the electronic control module is respectively connected with the high-power continuous optical fiber laser module group and the high-power pulse optical fiber laser module group, the output ends of the high-power continuous optical fiber laser module group and the high-power pulse optical fiber laser module group are jointly connected to the all-fiber laser beam combiner module, and the all-fiber laser beam combiner module is connected with the laser output head;
the electric control module is used for controlling the opening or closing of the high-power continuous fiber laser module group and the high-power pulse fiber laser module group, and detecting the running states of the high-power continuous fiber laser module group, the high-power pulse fiber laser module group and the all-fiber laser beam combiner module;
the high-power continuous optical fiber laser module group consists of N high-power continuous optical fiber laser modules, wherein N is more than or equal to 1 and is used for independently generating high-power continuous laser;
the high-power pulse fiber laser module group consists of M high-power pulse fiber laser modules, wherein M is more than or equal to 1 and is used for independently generating high-power pulse laser;
and the all-fiber laser beam combination module is used for coupling and combining the input continuous fiber laser and the pulse fiber laser so as to output the continuous pulse composite mode fiber laser.
Furthermore, the N high-power continuous fiber laser modules and the M high-power pulse fiber laser modules are independent from each other and are controlled by the electric control module to be independently opened and closed.
Furthermore, the high-power continuous fiber laser module is a high-power continuous fiber laser oscillator and directly outputs high-power continuous fiber laser.
Furthermore, the high-power continuous fiber laser module is a high-power continuous fiber laser based on a main oscillation power amplification structure and comprises a continuous fiber laser oscillator and a fiber amplifier, wherein one end of the fiber amplifier is connected with the continuous fiber laser oscillator, and the other end of the fiber amplifier is connected with the all-fiber laser beam combination module;
a continuous fiber laser oscillator for generating a continuous seed laser;
and the optical fiber amplifier is used for receiving the continuous seed laser and amplifying the continuous seed laser to generate high-power continuous optical fiber laser.
Furthermore, the high-power pulse fiber module is a high-power pulse fiber laser oscillator which directly outputs high-power pulse fiber laser.
Furthermore, the high-power continuous fiber laser module is a high-power pulse fiber laser based on a main oscillation power amplification structure and comprises a pulse fiber laser oscillator and a fiber amplifier, wherein one end of the fiber amplifier is connected with the pulse fiber laser oscillator, and the other end of the fiber amplifier is connected with the all-fiber laser beam combination module;
a pulse fiber laser oscillator for generating a pulse seed laser;
and the optical fiber amplifier is used for receiving the pulse seed laser and amplifying the pulse seed laser to generate high-power pulse optical fiber laser.
Further, the output of the high-power pulse fiber laser module group is millisecond laser pulse, nanosecond laser pulse, picosecond laser pulse, femtosecond laser pulse or composite laser second pulse with various pulse widths.
Furthermore, the full-fiber beam combining module is a full-fiber laser power beam combiner for outputting the central beam, and couples and combines the continuous fiber laser and the pulse fiber laser to generate a continuous pulse compound mode fiber laser for outputting the central beam.
Furthermore, the full-optical-fiber beam combining module is a high-power full-optical-fiber laser beam combiner with adjustable output beam shape, the continuous optical-fiber laser and the pulse optical-fiber laser are coupled and combined to generate a continuous pulse composite mode optical-fiber laser consisting of a central beam and a peripheral annular beam, and the power of the central beam and the power of the peripheral annular beam can be adjusted.
Furthermore, the laser output head is a quartz glass end cap, an included angle formed between the laser output head and the vertical direction is larger than 8 degrees, and a signal light anti-reflection film for inhibiting self-oscillation is arranged on the end face of the laser output head.
The invention has the following beneficial technical effects:
according to the invention, the continuous fiber laser module and the pulse fiber laser module are subjected to power beam combination through the all-fiber laser beam combiner, so that a continuous pulse compound mode high-power all-fiber laser system is realized, only continuous laser or only pulse laser can be output, the continuous laser and the pulse laser can be output simultaneously, and the power ratio of the continuous laser to the pulse laser can be adjusted;
by using the optical fiber laser beam combiner with the adjustable beam shape, the output point annular laser beam can be realized, and the optical fiber laser beam combiner is composed of a central beam and a peripheral annular beam, and the beam shape can be adjusted;
the laser optical path realizes full optical fiber, enhances the stability and reliability of the laser system and has better industrial application prospect;
the laser system realizes modular design, is easy to expand the output power and functionality of the laser, has simple structure and is easy to assemble and produce in batches.
Drawings
FIG. 1 is a schematic structural diagram of a continuous pulse composite mode high power all-fiber laser system of the present invention;
wherein, 1, an electric control module; 2-high power continuous fiber laser module group; 21-a first high power continuous fiber laser module; 22-a second high power continuous fiber laser module; 2N-Nth high-power continuous fiber laser module; 3-high power pulse fiber laser module group; 31-a first high power pulse fiber laser module; 32-a second high power pulse fiber laser module; 3M-Mth high-power pulse fiber laser module; 4-all-fiber laser beam combination module; 5-laser output head;
fig. 2 is a schematic structural diagram of a continuous pulse composite mode high power all-fiber laser system according to an embodiment of the present invention;
23-a third high-power continuous fiber laser module; 33 a third high-power pulse fiber laser module; 34-a fourth high power pulse fiber laser module;
fig. 3 is a schematic optical path diagram of a medium-high power continuous fiber laser module according to the first and second embodiments of the present invention;
211-first semiconductor pump; 212-forward (6+1) × 1 fiber pump signal combiner; 213-first highly reflective fiber grating; 214-a first ytterbium-doped double-clad fiber; 215-a first low reflection fiber grating; 216-a first reverse (6+1) × 1 fiber pump signal combiner; 217-first packet mode filter; 218-a first output fiber;
fig. 4 is a schematic optical path diagram of a medium-high power pulse fiber laser module according to the first and second embodiments of the present invention;
311-second semiconductor pump; 312- (2+1) × 1 optical fiber pump signal combiner; 313-a second highly reflective fiber grating; 314-a second ytterbium-doped double-clad fiber; 315-second cladding mode filter; 316-fiber coupled acousto-optic modulator; 317-second low reflection fiber grating; 318-fiber isolator; 319-third cladding mode filter; 320-third semiconductor pump; 321-forward (6+1) x 1 optical fiber pumping signal beam combiner; 322-a third ytterbium-doped double-clad fiber; 323-a second reverse (6+1) × 1 fiber pump signal combiner; 324-a fourth cladding mode filter; 325-a second output fiber;
FIG. 5 is a schematic diagram of an all-fiber laser beam combining module according to an embodiment of the present invention;
41-first input optical fiber; 42 is a third output fiber;
fig. 6 is a schematic cross-sectional view of an output fiber of an all-fiber laser beam combining module according to an embodiment of the present invention;
420-output optical fiber core; 421-output fiber first cladding; 422-output fiber second cladding;
FIG. 7 is a schematic structural diagram of a two-continuous pulse composite mode high power all-fiber laser system according to an embodiment of the present invention;
the 35-high-power pulse fiber laser module V is arranged in the shell; 36-high power pulse fiber laser module six;
FIG. 8 is a schematic structural diagram of an all-fiber laser beam combining module with an adjustable output beam shape according to a second embodiment of the present invention;
43-second input fiber; 44-a fourth output fiber;
fig. 9 is a schematic cross-sectional view of an output fiber of an all-fiber laser beam combining module according to a second embodiment of the present invention;
420-output optical fiber core; 421-output fiber first cladding; 422-output fiber second cladding; 423-output fiber third cladding; 424-output fiber fourth cladding; 425-fifth cladding of output fiber.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the embodiments of the present invention.
As shown in fig. 1, a continuous pulse composite mode high-power all-fiber laser system includes an electric control module 1, a high-power continuous fiber laser module group 2, a high-power pulse fiber laser module group 3, an all-fiber laser beam combining module 4, and a laser output head 5.
The electronic control module 1 is used for controlling the opening or closing of the high-power continuous fiber laser module group and the high-power pulse fiber laser module group, and detecting the running states of the high-power continuous fiber laser module group, the high-power pulse fiber laser module group and the all-fiber laser beam combiner module;
the high-power continuous optical fiber laser module group 2 consists of N high-power continuous optical fiber laser modules, wherein N is more than or equal to 1 and is used for independently generating high-power continuous laser;
the high-power pulse fiber laser module group 3 consists of M high-power pulse fiber laser modules, wherein M is more than or equal to 1 and is used for independently generating high-power pulse laser;
and the all-fiber laser beam combination module 4 is used for coupling and combining the input continuous fiber laser and the pulse fiber laser so as to output the continuous pulse composite mode fiber laser.
Specifically, the high-power continuous fiber laser module group and the high-power pulse fiber laser module group are independent from each other and are controlled by the electric control module to realize independent opening and independent closing; the high-power continuous optical fiber laser modules in the high-power continuous optical fiber laser module group are independent, N is more than or equal to 1, and the high-power continuous optical fiber laser modules are controlled by the electric control module to be independently opened and closed; m high-power pulse fiber laser modules contained in the high-power pulse fiber laser module group are independent, M is more than or equal to 1, and the high-power pulse fiber laser modules are controlled by the electric control module to realize independent opening and independent closing;
specifically, the high-power continuous fiber laser module can be a high-power continuous fiber laser oscillator which directly outputs high-power continuous fiber laser; the high-power continuous fiber laser module can also be a high-power continuous fiber laser based on a main oscillation power amplification structure and comprises a continuous fiber laser oscillator and a fiber amplifier, wherein one end of the fiber amplifier is connected with the oscillator, and the other end of the fiber amplifier is connected with the all-fiber laser beam combining module; the continuous fiber laser oscillator is used for generating continuous seed laser; the optical fiber amplifier is used for receiving the continuous seed laser and amplifying the continuous seed laser to generate high-power continuous optical fiber laser;
specifically, the high-power pulse fiber laser module can be a high-power pulse fiber laser oscillator which directly outputs high-power pulse fiber laser; the high-power continuous fiber laser module can also be a high-power pulse fiber laser based on a main oscillation power amplification structure and comprises a pulse fiber laser oscillator and a fiber amplifier, wherein one end of the fiber amplifier is connected with the oscillator, and the other end of the fiber amplifier is connected with the all-fiber laser beam combination module; the pulse fiber laser oscillator is used for generating pulse seed laser; the optical fiber amplifier is used for receiving the pulse seed laser and amplifying the pulse seed laser to generate high-power pulse optical fiber laser;
specifically, the high-power pulse fiber laser module group can output millisecond laser pulses, nanosecond laser pulses, picosecond laser pulses or femtosecond laser pulses; composite laser second impact with various pulse widths can be output simultaneously;
specifically, the all-fiber laser beam combining module may be an all-fiber laser power beam combiner for outputting a central beam, and is configured to couple and combine the turned-on input continuous fiber laser and pulse fiber laser to generate a continuous pulse composite mode fiber laser for outputting the central beam; the all-fiber laser beam combining module can also be a high-power all-fiber laser beam combiner with adjustable output beam shape, and is used for coupling and combining the opened input continuous fiber laser and the pulse fiber laser to generate continuous pulse composite mode fiber laser consisting of a central beam and a peripheral annular beam, and the power of the central beam and the peripheral annular beam can be adjusted; the laser output head is a quartz glass end cap, the included angle formed between the laser output head and the vertical direction is more than 8 degrees, and the end face of the laser output head is plated with a signal light anti-reflection film for inhibiting self-oscillation.
The first embodiment is as follows:
as shown in fig. 2, the system of the continuous pulse composite mode high power all-fiber laser includes an electric control module 1, a high power continuous fiber laser module group 2, a high power pulse fiber laser module group 3, an all-fiber laser beam combining module 4 and a laser output head 5.
The high-power continuous fiber laser module group 2 consists of three modules, namely a first high-power continuous fiber laser module 21, a second high-power continuous fiber laser module 22 and a third high-power continuous fiber laser module 23. Each module is a high-power continuous fiber laser oscillator with an output power of about 2kW, as shown in fig. 3, taking the first high-power continuous fiber laser module 21 as an example, it includes a first semiconductor pump 211, a forward (6+1) × 1 fiber pump signal combiner 212, a first highly reflective fiber grating 213, a first ytterbium-doped double-clad fiber 214, a first low reflective fiber grating 215, a first reverse (6+1) × 1 fiber pump signal combiner 216, a first cladding mode filter 217, and a first output fiber 218. The working wavelength of the first semiconductor pump 211 is 915nm, the output power is 300W, the fiber core/cladding is 200 mu m/220 mu m, and the fiber core NA is about 0.22; the forward (6+1) × 1 optical fiber pump signal beam combiner 212 has 6 pump fibers, the fiber core/cladding is 200/220 μm, the fiber core NA is about 0.22, the input signal fiber and the output signal fiber are both 20 μm/400 μm double-cladding passive fibers, and the fiber core NA is about 0.065; the first high-reflectivity fiber grating 213 is written on a 20 mu m/400 mu m double-cladding passive fiber, and the reflectivity at 1080nm is higher than 99%; the first low-reflectivity fiber grating 215 is written on a 20 μm/400 μm double-clad passive fiber with a reflectivity of about 15% at 1080 nm; the first ytterbium-doped double-clad fiber 214 is a 20 μm/400 μm ytterbium-doped double-clad fiber with a core NA of about 0.065 and an absorption coefficient at 915nm of about 0.4 dB/m; the tail fiber of the first cladding mode filter 217 is a 20 μm/400 μm double-clad passive fiber with a core NA of about 0.065, and is used for stripping a laser mode transmitted in the fiber cladding; the first output fiber 218 is a 50 μm/250 μm double clad passive fiber with a core NA of about 0.12.
As shown in fig. 2, the high power pulse fiber laser module set 3 is composed of four modules, namely a first high power pulse fiber laser module 31, a second high power pulse fiber laser module 32, a third high power pulse fiber laser module 33, and a fourth high power pulse fiber laser module 34. Each module is a nanosecond pulse fiber laser which is based on a main oscillation power amplification structure and can output 300W average power, the pulse width is about 100ns, the repetition frequency is about 50kHz, as shown in figure 4, a first high-power pulse fiber laser module 31 is taken as an example, the optical fiber coupling device comprises a second semiconductor pump 311, a (2+1) × 1 optical fiber pump signal combiner 312, a high-reflection optical fiber grating 313, a second ytterbium-doped double-clad optical fiber 314, a second cladding mode filter 315, an optical fiber coupling acousto-optic modulator 316, a second low-reflection optical fiber grating 317, an optical fiber isolator 318, a third cladding mode filter 319, a third semiconductor pump 320, a forward (6+1) × 1 optical fiber pump signal combiner 321, a third ytterbium-doped double-clad optical fiber 322, a reverse (6+1) × 1 optical fiber pump signal combiner 323, a fourth cladding mode filter 324 and a second output optical fiber 325. The working wavelength of the second semiconductor pump 311 is 915nm, the output power is 20W, the fiber core/cladding is 105 μm/125 μm, and the fiber core NA is about 0.22; the (2+1) × 1 optical fiber pump signal combiner 312 has 2 pump fibers, the fiber core/cladding is 105 μm/125 μm, the fiber core NA is about 0.22, the input signal fiber and the output signal fiber are both 10 μm/130 μm double-cladding passive fibers, and the fiber core NA is about 0.08; the second high-reflectivity fiber grating 313 is written on a 10 mu m/130 mu m double-cladding passive fiber, and the reflectivity at 1064nm is higher than 99%; the second low-reflectivity fiber grating 317 is written on a 10 μm/130 μm double-clad passive fiber with a reflectivity of about 15% at 1064 nm; the second ytterbium-doped double-clad fiber 314 is a 10 μm/130 μm ytterbium-doped double-clad fiber, has a core NA of about 0.08, and has an absorption coefficient of about 1dB/m at 915 nm; the tail fiber of the second cladding mode filter 315 is a 10 μm/130 μm double-clad passive fiber with a core NA of about 0.08 for stripping the laser mode propagating in the fiber cladding; the tail fiber of the fiber coupling acousto-optic modulator 316 is a 10 mu m/130 mu m double-cladding passive fiber, the fiber core NA is about 0.08, and the fiber coupling acousto-optic modulator is used as a Q-switching element in a fiber oscillator and used for generating nanosecond laser pulses; the tail fiber of the optical fiber isolator 318 is a single-cladding passive optical fiber with the diameter of 10 mu m/130 mu m; the tail fiber of the third cladding mode filter 319 is a 10 μm/130 μm double-clad passive fiber with a core NA of about 0.08 for stripping the laser mode propagating in the fiber cladding; the working wavelength of the third semiconductor pump 320 is 915nm, the output power is 50W, the fiber core/cladding is 105 μm/125 μm, and the fiber core NA is about 0.22; the forward (6+1) × 1 optical fiber pump signal beam combiner 321 has 6 pump fibers, the fiber core/cladding is 105 μm/125 μm, the fiber core NA is about 0.22, the input signal fiber is 10 μm/130 μm double-cladding passive fiber, the fiber core NA is about 0.08, the output signal fiber is 50 μm/400 μm double-cladding passive fiber, and the fiber core NA is about 0.065; the third ytterbium-doped double-clad fiber 322 is a 50 μm/400 μm ytterbium-doped double-clad fiber, the core NA is about 0.065, and the absorption coefficient at 915nm is about 1.6 dB/m; the second reverse (6+1) multiplied by 1 optical fiber pumping signal beam combiner 323 is provided with 6 pumping fibers, the fiber core/cladding is 105 μm/125 μm, the fiber core NA is about 0.22, the input and output signal fibers are both 50 μm/400 μm double-cladding passive fibers, and the fiber core NA is about 0.065; the tail fiber of the fourth cladding mode filter 324 is a 50 μm/250 μm double-clad passive fiber with a core NA of about 0.12 for stripping the laser mode propagating in the fiber cladding; the second output fiber 325 is a 50 μm/250 μm double clad passive fiber with a core NA of about 0.12.
As shown in fig. 5, the all-fiber laser beam combining module 4 is a 7 × 1 fiber laser beam combining module, and has 7 first input fibers 41, where the first input fibers 41 are both 50 μm/250 μm double-clad passive fibers, and the core NA is about 0.12; there are 1 third output optical fiber 42, and the third output optical fiber 42 is a double-clad passive optical fiber, and as shown in fig. 6, is a cross-sectional view of the third output optical fiber, and the third output optical fiber includes a core 420, a first cladding 421, and a second cladding 422. The third output fiber core 420 is pure silica, the first cladding 421 is a fluorine-doped silica dip layer, and the second cladding 422 is a low refractive index acrylate; the core NA is about 0.22 and the first cladding NA is about 0.46; the core diameter was 300 μm, the first cladding outer diameter was 360 μm, and the second cladding outer diameter was 460 μm. The first output fibers 218 of the three high-power continuous fiber laser modules are connected with 3 first input fibers 41 of the all-fiber laser beam combination module, the second output fibers 325 of the four high-power pulse fiber laser modules are connected with the other 4 first input fibers 41 of the all-fiber laser beam combination module, and the high-power continuous laser output by the high-power continuous fiber laser module and the high-power pulse laser output by the high-power pulse fiber laser module are coupled and combined into a beam through the beam combination module to enter an output fiber core 421 for output; the continuous optical fiber laser module and the pulse optical fiber laser module are controlled to be independently opened and closed through the electric control module 1, so that the following working modes are realized: only continuous laser is output, and the output light beam is a central circular light beam; only pulse laser is output, and the output light beam is a central circular light beam; the continuous laser and the pulse laser are output simultaneously, the output beam is a central circular beam, and the power ratio of the output continuous laser to the output pulse laser is adjustable. The switching between the several working modes can be controlled by the electronic control module 1.
The laser output head 5 is a quartz glass end cap, the tail fiber of the optical fiber end cap is a 300 mu m/360 mu m double-clad passive fiber, and the core NA is about 0.22. The third output optical fiber 42 of the all-fiber laser beam combination module 4 is connected with the tail fiber of the optical fiber end cap, the optical fiber laser in the high-power continuous pulse compound mode is output through the optical fiber end cap, the optical fiber end cap forms an inclination angle of more than 8 degrees with the vertical direction, and the end face of the optical fiber end cap is plated with a signal light anti-reflection film for inhibiting self-oscillation.
Example two:
fig. 7 shows a continuous pulse composite mode high-power all-fiber laser system, which includes an electric control module 1, a high-power continuous fiber laser module group 2, a high-power pulse fiber laser module group 3, an all-fiber laser beam combining module 4, and a laser output head 5.
As shown in fig. 7, the high power continuous fiber laser module 2 includes a high power continuous fiber laser module 21, which is a high power continuous fiber laser oscillator with an output power of about 2kW, and as shown in fig. 3, it includes a first semiconductor pump 211, a forward (6+1) × 1 fiber pump signal combiner 212, a first highly reflective fiber grating 213, a first ytterbium-doped double-clad fiber 214, a first low reflective fiber grating 215, a first reverse (6+1) × 1 fiber pump signal combiner 216, a first cladding mode filter 217, and a first output fiber 218. The working wavelength of the first semiconductor pump 211 is 915nm, the output power is 300W, the fiber core/cladding is 200 mu m/220 mu m, and the fiber core NA is about 0.22; the forward (6+1) × 1 optical fiber pump signal beam combiner 212 has 6 pump fibers, the fiber core/cladding is 200/220 μm, the fiber core NA is about 0.22, the input signal fiber and the output signal fiber are both 20 μm/400 μm double-cladding passive fibers, and the fiber core NA is about 0.065; the first high-reflectivity fiber grating 213 is written on a 20 mu m/400 mu m double-cladding passive fiber, and the reflectivity at 1080nm is higher than 99%; the first low-reflectivity fiber grating 215 is written on a 20 μm/400 μm double-clad passive fiber with a reflectivity of about 15% at 1080 nm; the first ytterbium-doped double-clad fiber 214 is a 20 μm/400 μm ytterbium-doped double-clad fiber with a core NA of about 0.065 and an absorption coefficient at 915nm of about 0.4 dB/m; the tail fiber of the first cladding mode filter 217 is a 20 μm/400 μm double-clad passive fiber with a core NA of about 0.065, and is used for stripping a laser mode transmitted in the fiber cladding; the first output fiber 218 is a 50 μm/250 μm double clad passive fiber with a core NA of about 0.12.
As shown in fig. 7, the high power pulse fiber laser module set 3 is composed of six modules, namely, a first high power pulse fiber laser module 31, a second high power pulse fiber laser module 32, a third high power pulse fiber laser module 33, a fourth high power pulse fiber laser module 34, a fifth high power pulse fiber laser module 35, and a sixth high power pulse fiber laser module 36. Each module is a nanosecond pulse fiber laser which is based on a main oscillation power amplification structure and can output 300W average power, the pulse width is about 100ns, the repetition frequency is about 50kHz, as shown in figure 4, a first high-power pulse fiber laser module 31 is taken as an example, the fiber-optic hybrid fiber laser comprises a second semiconductor pump 311, (2+1) multiplied by 1 fiber pump signal combiner 312, a second high-reflection fiber grating 313, a second ytterbium-doped double-clad fiber 314, a second cladding mode filter 315, a fiber-coupled acousto-optic modulator 316, a second low-reflection fiber grating 317, a fiber isolator 318, a third cladding mode filter 319, a third semiconductor pump 320, a forward (6+1) multiplied by 1 fiber pump signal combiner 321, a third ytterbium-doped double-clad fiber 322, a second reverse (6+1) multiplied by 1 fiber pump signal combiner 323, a fourth cladding mode filter 324 and a second output fiber 325. The working wavelength of the second semiconductor pump 311 is 915nm, the output power is 20W, the fiber core/cladding is 105 μm/125 μm, and the fiber core NA is about 0.22; the (2+1) × 1 optical fiber pump signal combiner 312 has 2 pump fibers, the fiber core/cladding is 105 μm/125 μm, the fiber core NA is about 0.22, the input signal fiber and the output signal fiber are both 10 μm/130 μm double-cladding passive fibers, and the fiber core NA is about 0.08; the second high-reflectivity fiber grating 313 is written on a 10 mu m/130 mu m double-cladding passive fiber, and the reflectivity at 1064nm is higher than 99%; the second low-reflectivity fiber grating 317 is written on a 10 μm/130 μm double-clad passive fiber with a reflectivity of about 15% at 1064 nm; the second ytterbium-doped double-clad fiber 314 is a 10 μm/130 μm ytterbium-doped double-clad fiber, has a core NA of about 0.08, and has an absorption coefficient of about 1dB/m at 915 nm; the tail fiber of the second cladding mode filter 315 is a 10 μm/130 μm double-clad passive fiber with a core NA of about 0.08 for stripping the laser mode propagating in the fiber cladding; the tail fiber of the fiber coupling acousto-optic modulator 316 is a 10 mu m/130 mu m double-cladding passive fiber, the fiber core NA is about 0.08, and the fiber coupling acousto-optic modulator is used as a Q-switching element in a fiber oscillator and used for generating nanosecond laser pulses; the tail fiber of the optical fiber isolator 318 is a single-cladding passive optical fiber with the diameter of 10 mu m/130 mu m; the tail fiber of the third cladding mode filter 319 is a 10 μm/130 μm double-clad passive fiber with a core NA of about 0.08 for stripping the laser mode propagating in the fiber cladding; the working wavelength of the third semiconductor pump 320 is 915nm, the output power is 50W, the fiber core/cladding is 105 μm/125 μm, and the fiber core NA is about 0.22; the forward (6+1) × 1 optical fiber pump signal beam combiner 321 has 6 pump fibers, the fiber core/cladding is 105 μm/125 μm, the fiber core NA is about 0.22, the input signal fiber is 10 μm/130 μm double-cladding passive fiber, the fiber core NA is about 0.08, the output signal fiber is 50 μm/400 μm double-cladding passive fiber, and the fiber core NA is about 0.065; the third ytterbium-doped double-clad fiber 322 is a 50 μm/400 μm ytterbium-doped double-clad fiber, the core NA is about 0.065, and the absorption coefficient at 915nm is about 1.6 dB/m; the second reverse (6+1) multiplied by 1 optical fiber pumping signal beam combiner 323 is provided with 6 pumping fibers, the fiber core/cladding is 105 μm/125 μm, the fiber core NA is about 0.22, the input and output signal fibers are both 50 μm/400 μm double-cladding passive fibers, and the fiber core NA is about 0.065; the tail fiber of the fourth cladding mode filter 324 is a 50 μm/250 μm double-clad passive fiber with a core NA of about 0.12 for stripping the laser mode propagating in the fiber cladding; the second output fiber 325 is a 50 μm/250 μm double clad passive fiber with a core NA of about 0.12.
As shown in fig. 8, the all-fiber laser beam combining module 4 is a fiber laser beam combining module with an adjustable 7 × 1 output beam shape, and has 7 second input fibers 43, wherein 1 of the 7 second input fibers is a central input fiber and is a 50 μm/250 μm double-clad passive fiber, and the fiber core NA is about 0.12; 6 peripheral input optical fibers are provided, and are 50 mu m/250 mu m double-clad passive optical fibers, and the fiber core NA is about 0.12; there are 1 fourth output fiber 44, the fourth output fiber 44 is a multi-clad passive fiber, fig. 9 is a cross-sectional view of the fourth output fiber 44, and the fourth output fiber 44 includes a core 420, a first cladding 421, a second cladding 422, a third cladding 423, a fourth cladding 424, and a fifth cladding 425. The output fiber core 420, second cladding 422, fourth cladding 424 are pure silica, the first cladding 421 and third cladding 423 are fluorine-doped silica dip layers, and the fifth cladding 425 is a low index acrylate; a core NA of about 0.22, a second cladding NA of about 0.22, and a fourth cladding NA of about 0.46; the core diameter is 100 μm, the first cladding outer diameter is 130 μm, the second cladding outer diameter is 300 μm, the third cladding outer diameter is 360 μm, the fourth cladding outer diameter is 460 μm, and the fifth cladding outer diameter is 560 μm. The first output optical fiber 218 of the high-power continuous fiber laser module 21 is connected with the central input optical fiber of the all-fiber laser beam combining module, the second output optical fibers 325 of the six high-power pulse fiber laser modules are connected with 6 peripheral input optical fibers of the all-fiber laser beam combining module, the high-power continuous laser output by the high-power continuous fiber laser module is coupled and enters the fiber core 420 of the fourth output optical fiber, and the high-power pulse laser output by the high-power pulse fiber laser module is coupled and combined into the second cladding 422 of the fourth output optical fiber through the beam combining module and is output; the continuous fiber laser module and the pulse fiber laser module are controlled to be independently opened and closed through the electric control module, so that the following working modes are realized: only continuous laser is output, and the output light beam is a central circular light beam; only pulse laser is output, and the output light beam is a peripheral annular light beam; the continuous laser and the pulse laser are simultaneously output, the output beam is a combination of a central circular beam and a peripheral annular beam, the power ratio of the output continuous laser and the output pulse laser is adjustable, the shape of the output beam can be adjusted, and the switching among a plurality of working modes can be controlled by the electric control module.
The laser output head 5 is a quartz glass end cap, and the fiber end cap tail fiber is a multi-cladding passive fiber and comprises a fiber core 420, a first cladding 421, a second cladding 422, a third cladding 423, a fourth cladding 424 and a fifth cladding 425. The output fiber core 420, second cladding 422, fourth cladding 424 are pure silica, the first cladding 421 and third cladding 423 are fluorine-doped silica dip layers, and the fifth cladding 425 is a low index acrylate; a core NA of about 0.22, a second cladding NA of about 0.22, and a fourth cladding NA of about 0.46; the core diameter is 100 μm, the first cladding outer diameter is 130 μm, the second cladding outer diameter is 300 μm, the third cladding outer diameter is 360 μm, the fourth cladding outer diameter is 460 μm, and the fifth cladding outer diameter is 560 μm. And a fourth output optical fiber of the all-fiber laser beam combination module is connected with a tail fiber of an optical fiber end cap, the optical fiber laser in a high-power continuous pulse compound mode is output through the optical fiber end cap, the optical fiber end cap has an inclination angle of more than 8 degrees, and the end face of the optical fiber end cap is plated with a signal light anti-reflection film for inhibiting self-oscillation.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. A continuous pulse compound mode high-power all-fiber laser system is characterized by comprising an electric control module, a high-power continuous fiber laser module group, a high-power pulse fiber laser module group, an all-fiber laser beam combination module and a laser output head; the electronic control module is respectively connected with the high-power continuous optical fiber laser module group and the high-power pulse optical fiber laser module group, the output ends of the high-power continuous optical fiber laser module group and the high-power pulse optical fiber laser module group are jointly connected to the all-fiber laser beam combiner module, and the all-fiber laser beam combiner module is connected with the laser output head;
the electric control module is used for controlling the high-power continuous optical fiber laser module group and the high-power pulse optical fiber laser module group to be opened or closed, and detecting the running states of the high-power continuous optical fiber laser module group, the high-power pulse optical fiber laser module group and the all-fiber laser beam combiner module;
the high-power continuous optical fiber laser module group consists of N high-power continuous optical fiber laser modules, wherein N is more than or equal to 1 and is used for independently generating high-power continuous laser;
the high-power pulse fiber laser module group consists of M high-power pulse fiber laser modules, wherein M is more than or equal to 1 and is used for independently generating high-power pulse laser;
the all-fiber laser beam combination module is used for coupling and combining input continuous fiber laser and pulse fiber laser so as to output continuous pulse composite mode fiber laser.
2. The continuous-pulse composite-mode high-power all-fiber laser system according to claim 1, wherein the N high-power continuous fiber laser modules and the M high-power pulse fiber laser modules are independent of each other, and are controlled by an electronic control module to be independently turned on and off.
3. The continuous-pulse composite-mode high-power all-fiber laser system according to claim 1, wherein the high-power continuous-fiber laser module is a high-power continuous-fiber laser oscillator directly outputting a high-power continuous-fiber laser.
4. The continuous-pulse composite-mode high-power all-fiber laser system according to claim 1, wherein the high-power continuous fiber laser module is a high-power continuous fiber laser based on a main oscillation power amplification structure, and comprises a continuous fiber laser oscillator and a fiber amplifier, one end of the fiber amplifier is connected with the continuous fiber laser oscillator, and the other end of the fiber amplifier is connected with the all-fiber laser beam combination module;
the continuous fiber laser oscillator is used for generating continuous seed laser;
the optical fiber amplifier is used for receiving the continuous seed laser and amplifying the continuous seed laser to generate high-power continuous optical fiber laser.
5. The continuous-pulse composite-mode high-power all-fiber laser system according to claim 1, wherein the high-power pulse fiber module is a high-power pulse fiber laser oscillator directly outputting a high-power pulse fiber laser.
6. The continuous-pulse composite-mode high-power all-fiber laser system according to claim 1, wherein the high-power continuous fiber laser module is a high-power pulse fiber laser based on a main oscillation power amplification structure, and comprises a pulse fiber laser oscillator and a fiber amplifier, one end of the fiber amplifier is connected with the pulse fiber laser oscillator, and the other end of the fiber amplifier is connected with the all-fiber laser beam combination module;
the pulse fiber laser oscillator is used for generating pulse seed laser;
the optical fiber amplifier is used for receiving the pulse seed laser and amplifying the pulse seed laser to generate high-power pulse optical fiber laser.
7. The continuous-pulse composite-mode high-power all-fiber laser system according to claim 1, wherein the output of the high-power pulse fiber laser module group is a millisecond laser pulse, a nanosecond laser pulse, a picosecond laser pulse, a femtosecond laser pulse or a composite laser pulse of various pulse widths.
8. The continuous-pulse composite-mode high-power all-fiber laser system according to claim 1, wherein the all-fiber beam combiner module is an all-fiber laser power beam combiner for outputting a central beam, and couples and combines the continuous fiber laser and the pulse fiber laser to generate the continuous-pulse composite-mode fiber laser for outputting the central beam.
9. The system according to claim 1, wherein the all-fiber beam combining module is an output beam shape-adjustable high-power all-fiber laser beam combiner, and couples and combines the continuous fiber laser and the pulsed fiber laser to generate the continuous pulse composite mode fiber laser composed of a central beam and a peripheral ring beam, and the power of the central beam and the peripheral ring beam can be adjusted.
10. The continuous-pulse composite-mode high-power all-fiber laser system according to claim 1, wherein the laser output head is a quartz glass end cap, forms an angle with the vertical direction of more than 8 degrees, and has a signal light antireflection film at its end face for suppressing self-oscillation.
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Application publication date: 20211217 |