CN219419843U - Optical fiber laser - Google Patents
Optical fiber laser Download PDFInfo
- Publication number
- CN219419843U CN219419843U CN202320856021.8U CN202320856021U CN219419843U CN 219419843 U CN219419843 U CN 219419843U CN 202320856021 U CN202320856021 U CN 202320856021U CN 219419843 U CN219419843 U CN 219419843U
- Authority
- CN
- China
- Prior art keywords
- laser
- output
- wavelength
- frequency
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Landscapes
- Lasers (AREA)
Abstract
The embodiment of the application discloses a fiber laser. The optical fiber laser comprises a wavelength selection switch and a plurality of single-frequency laser units, wherein the output ends of the single-frequency laser units are connected with the wavelength selection switch, and the wavelength selection switch is used for receiving laser output by the single-frequency laser units, selecting and combining the received laser and outputting the laser; the single-frequency laser unit comprises a pumping source, a first wavelength division multiplexer, a laser resonant cavity and an optical isolator, wherein the pumping end of the first wavelength division multiplexer is connected with the pumping source, the laser resonant cavity is connected with the public end of the first wavelength division multiplexer, the input end of the optical isolator is connected with the signal end of the first wavelength division multiplexer, and the output end of the optical isolator is connected with the wavelength selective switch. According to the method, the received laser is output after being selected and combined by dynamic adjustment of the wavelength selection switch, so that the flexibility of wavelength selection is higher, and the adjustable range of the line width of the output laser is wider and the accuracy is higher.
Description
Technical Field
The application relates to the technical field of lasers, in particular to an optical fiber laser.
Background
The single-frequency fiber laser has the advantages of narrow output line width, good beam quality, low frequency noise, good coherence, compact structure and the like. The method is widely applied to the fields of spectrum synthesis, coherent optical communication, high-precision optical fiber sensing, gravitational wave detection, nonlinear frequency conversion, laser radar and the like. However, the requirements of different application requirements on the laser output laser linewidth are not the same. When the linewidth of output laser is regulated by the existing fiber laser, a nonlinear deflection effect of a semiconductor optical amplifier is often utilized to generate multiple wavelengths with narrow linewidth; or, the mode of restraining mode competition by utilizing columnar piezoelectric ceramics wound with single-mode fibers and then carrying out wavelength selection by combining polarization maintaining fibers is adopted to realize multi-wavelength tunability; or the central wavelength of the laser is adjusted by temperature and stress, and then coupled out by a combiner. However, the line width control precision of the laser output by the adjustment mode is not high, and the structure of the corresponding fiber laser is complex.
Disclosure of Invention
The embodiment of the application provides a fiber laser, which can solve the problem that the regulation and control precision of the existing fiber laser to the line width of output laser is lower.
The embodiment of the application provides an optical fiber laser, which comprises a wavelength selection switch and a plurality of single-frequency laser units, wherein the output ends of the single-frequency laser units are connected with the wavelength selection switch; the wavelength selection switch is used for receiving the laser light output by the single-frequency laser units, and outputting the received laser light after selecting and combining the received laser light;
wherein the single frequency laser unit comprises:
a pump source;
the pumping end of the first wavelength division multiplexer is connected with the pumping source;
the laser resonant cavity is connected with the public end of the first wavelength division multiplexer;
the input end of the optical isolator is connected with the signal end of the first wavelength division multiplexer, and the output end of the optical isolator is connected with the wavelength selection switch.
Optionally, in some embodiments of the present application, the single-frequency laser unit includes a gain fiber, where the gain fiber is connected to a common end of the wavelength division multiplexer, and a phase shift grating is inscribed on the gain fiber, and the phase shift grating forms the laser resonant cavity.
Optionally, in some embodiments of the present application, a gate region length of the phase shift grating is greater than or equal to 35mm and less than or equal to 45mm; the phase shift amount of the phase shift grating is pi.
Optionally, in some embodiments of the present application, the wavelength selective switch includes:
the input module is used for receiving the laser output by the single-frequency laser units and splitting the received laser into light beams with different wavelengths after combining the received laser beams;
the selection module is used for receiving the light beams with different wavelengths output by the input module and selecting and filtering the received light beams;
and the output module is used for receiving the light beams selected and filtered by the selection module, and outputting the received light beams after combining the light beams.
Optionally, in some embodiments of the present application, the input module includes:
the second wavelength division multiplexer is connected with the output ends of the single-frequency laser units and is used for receiving laser beams output by the single-frequency laser units and combining the received light beams;
the first array waveguide grating is connected with the second wavelength division multiplexer and is used for receiving the laser beams after the second wavelength division multiplexer is used for combining the laser beams and splitting the received laser beams into light beams with different wavelengths.
Optionally, in some embodiments of the present application, the input module includes a second arrayed waveguide grating, where the second arrayed waveguide grating is configured to receive laser light output by the multiple single-frequency laser units, and split the received laser light into light beams with different wavelengths after beam combination.
Optionally, in some embodiments of the present application, the selecting module includes a spatial light modulator, and the spatial light modulator is configured to receive the light beams with different wavelengths output by the input module, and adjust a phase of a wavelength of the received light beam to selectively filter the received light beam.
Optionally, in some embodiments of the present application, the output module includes a third arrayed waveguide grating, and the third arrayed waveguide grating is configured to receive the light beam selected and filtered by the selecting module, and combine the received light beam and output the combined light beam.
Optionally, in some embodiments of the present application, the single-frequency laser unit further includes a temperature control module and a piezoelectric ceramic, where the laser resonator is located in the temperature control module, the temperature control module is configured to control a temperature of the laser resonator, and the piezoelectric ceramic is connected to a side surface of the phase shift grating.
Optionally, in some embodiments of the present application, the wavelength selective switch has a plurality of input ports and a plurality of output ports, where a plurality of the input ports are connected to the output ends of a plurality of the single-frequency laser units in a one-to-one correspondence; the wavelength selection switch is used for receiving the laser light output by the single-frequency laser units, and outputting the laser light from any one of the output ports after selectively combining the received laser light.
The optical fiber laser comprises a wavelength selection switch and a plurality of single-frequency laser units, wherein the output ends of the single-frequency laser units are connected with the wavelength selection switch, and the wavelength selection switch is used for receiving laser output by the single-frequency laser units, selecting and combining the received laser and outputting the combined laser; the single-frequency laser unit comprises a pumping source, a first wavelength division multiplexer, a laser resonant cavity and an optical isolator, wherein the pumping end of the first wavelength division multiplexer is connected with the pumping source, the laser resonant cavity is connected with the public end of the first wavelength division multiplexer, the input end of the optical isolator is connected with the signal end of the first wavelength division multiplexer, and the output end of the optical isolator is connected with the wavelength selective switch. The laser output by the single-frequency laser units is received through the wavelength selection switch, and the received laser is output after being selected and combined by utilizing the dynamic adjustment of the wavelength selection switch, so that the flexibility of wavelength selection is higher, the laser line width after being combined is further effectively controlled, and the adjustable range of the optical fiber laser to the output laser line width is wider and the accuracy is higher.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a fiber laser according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a wavelength selective switch according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of another wavelength selective switch according to an embodiment of the present application.
Reference numerals illustrate:
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to generally refer to the upper and lower positions of the device in actual use or operation, and specifically the orientation of the drawing figures; while "inner" and "outer" are for the outline of the device.
The embodiment of the application provides a fiber laser, which is described in detail below. The following description of the embodiments is not intended to limit the preferred embodiments.
As shown in fig. 1, the fiber laser 100 includes a plurality of single-frequency laser units 110, and each single-frequency laser unit 110 includes a pump source 111, a first wavelength division multiplexer 112, a laser resonator 113, and an optical isolator 116. The pump end of the first wavelength division multiplexer 112 is connected to the pump source 111, the laser resonator 113 is connected to the common end of the first wavelength division multiplexer 112, and the input end of the optical isolator 116 is connected to the signal end of the first wavelength division multiplexer 112.
The pump source 111 is used for outputting pump light, the pump source 111 can select a single-mode semiconductor laser with the working wavelength of 976nm, the pump source 111 can realize continuous and stable output, and the output power of the pump source 111 can be adjusted by controlling current. In this embodiment, the pumping mode of the pump source 111 may adopt backward pumping, that is, the pump source 111 pumps the single-frequency laser to the laser resonator 113 through the first wavelength division multiplexer 112 backward, and the generated single-frequency fiber laser is output through the optical isolator 116. That is, the output end of the optical isolator 116 is the laser output end of the single frequency laser unit 110, and the optical isolator 116 is used for passing the light transmitted in the forward direction and isolating the light transmitted in the reverse direction, so that the reflected light is prevented from affecting the stability of the fiber laser 100.
The fiber laser 100 further includes a wavelength selective switch 120, where the wavelength selective switch 120 is connected to the output ends of the multiple single-frequency laser units 110, and the wavelength selective switch 120 is configured to receive the laser light output by the multiple single-frequency laser units 110, and selectively combine the received laser light and output the combined laser light. That is, each single-frequency laser unit 110 emits single-frequency laser light with a corresponding wavelength (frequency), the wavelength selection switch 120 receives multiple single-frequency laser light with different wavelengths (frequencies) at the same time, and selects the single-frequency laser light with a part of wavelengths (frequencies) to pass through, filters out the single-frequency laser light with other wavelengths (frequencies), and combines the single-frequency laser light with the selected part of wavelengths (frequencies) into one beam of laser light to output, thereby obtaining the single-frequency laser light with the final target wavelength (frequency).
Because the wavelength selective switch 120 can dynamically select and arrange and combine the single-frequency lasers with different wavelengths (frequencies) output by the multiple single-frequency laser units 110, the fiber laser 100 can flexibly select the received lasers according to the use requirement and then combine the lasers to output, thereby being beneficial to increasing the adjustable range of the fiber laser 100 on the linewidth of the output laser and improving the accuracy of regulating the linewidth.
In this embodiment, the fiber laser 100 includes a wavelength selective switch 120 and a plurality of single-frequency laser units 110, where output ends of the plurality of single-frequency laser units 110 are connected to the wavelength selective switch 120, and the wavelength selective switch 120 is configured to receive laser light output by the plurality of single-frequency laser units 110, and to selectively combine the received laser light and output the combined laser light; the single-frequency laser unit 110 includes a pump source 111, a first wavelength division multiplexer 112, a laser resonant cavity 113 and an optical isolator 116, wherein a pump end of the first wavelength division multiplexer 112 is connected with the pump source 111, the laser resonant cavity 113 is connected with a common end of the first wavelength division multiplexer 112, an input end of the optical isolator 116 is connected with a signal end of the first wavelength division multiplexer 112, and an output end of the optical isolator 116 is connected with a wavelength selective switch 120. The laser output by the plurality of single-frequency laser units 110 is received through the wavelength selection switch 120, and the received laser is output after being selected and combined by utilizing the dynamic adjustment of the wavelength selection switch 120, so that the flexibility of wavelength selection is higher, the laser linewidth after beam combination is further effectively controlled, and the adjustable range of the output laser linewidth of the fiber laser 100 is wider and the precision is higher.
Optionally, the single-frequency laser unit 110 includes a gain fiber 114, where the gain fiber 114 is connected to a common end of the wavelength division multiplexer, and a phase shift grating 115 is inscribed on the gain fiber 114, and the phase shift grating 115 forms the laser resonant cavity 113. Wherein the phase shift grating 115 is a special grating inscribed on the gain fiber 114, and the core of the gain fiber 114 is uniformly doped with high-concentration Yb 3 + 、Er 3+ 、Tm 3+ Isorare earth luminescent ion, or Cr 2+ 、Fe 2+ 、Ni 2+ And a transition metal ion. The phase shift grating 115 is directly inscribed on the gain optical fiber 114, so that the fiber laser 100 can adjust the phase shift amount of the phase shift grating 115 according to the adjustment of the inscribing process of the phase shift grating 115, thereby realizing single-frequency output of the laser output by the laser resonant cavity 113.
In some embodiments, the gate length of the phase-shift grating 115 is greater than or equal to 35mm and less than or equal to 45mm. The length of the gate region of the phase-shift grating 115 can affect the writing process of the phase-shift grating 115 and the formulation of the phase-shift amount, and the adjustment of the length of the gate region and the phase-shift amount of the phase-shift grating 115 is helpful to realize the selection of the wavelength (frequency) of the laser output by the laser resonant cavity 113, so as to realize the single-frequency output of the laser output by the single-frequency laser unit 110, and further facilitate the adjustment of the linewidth range of the laser output by the fiber laser 100.
In the actual manufacturing process, the length of the grating region of the phase-shift grating 115 can be set to 35mm, 40mm, 45mm, or the like, and the specific value of the length can be adaptively adjusted according to the actual use requirement, which is not particularly limited.
The phase shift amount of the phase shift grating 115 can be pi, that is, when the pump light is transmitted to the phase shift position on the phase shift grating 115, the output spectrum of the pump light will jump by the phase shift amount pi, so that only part of the light waves in the output spectrum can be continuously transmitted, and other light waves are filtered and lost, thereby realizing single-frequency output of the laser output by the single-frequency laser unit 110.
It should be noted that, in the embodiment of the present application, the phase shift amount of the phase shift grating 115 can also be set to pi/2 or 3 pi/4, and the specific value of the phase shift amount can be adaptively adjusted according to the actual design requirement, which is not limited in particular.
Optionally, as shown in fig. 2 and fig. 3, the wavelength selection switch 120 includes an input module 121, a selection module 122, and an output module 123, where the input module 121 is configured to receive laser beams output by the multiple single-frequency laser units 110, and split the received laser beams into beams with different wavelengths after beam combination; the selecting module 122 is configured to receive the light beams with different wavelengths output by the input module 121, and select and filter the received light beams; the output module 123 is configured to receive the filtered light beam selected by the selecting module 122, and combine the received light beams for output.
That is, all the lasers output by the plurality of single-frequency laser units 110 are directly received by the input module 121 of the wavelength selection switch 120, the input module 121 firstly combines the single-frequency lasers with different wavelengths (frequencies) to form a beam for transmission, then splits the single-frequency lasers into different light waves according to the different wavelengths (frequencies), and transmits the different light waves to the selection module 122, the selection module 122 changes the phase of the received light waves according to the use requirement, so that the selected part of light waves are output, the unselected part of light waves are filtered, the selected light waves are transmitted to the output module 123 in a specified direction, and the output module 123 combines the received light waves with different wavelengths (frequencies) to obtain the laser with the target line width and output the laser beams.
In some embodiments, as shown in fig. 2, the input module 121 includes a second wavelength division multiplexer 1211 and a first arrayed waveguide grating 1212, the second wavelength division multiplexer 1211 is connected to the output ends of the plurality of single-frequency laser units 110, and the second wavelength division multiplexer 1211 is used for receiving the laser light output by the plurality of single-frequency laser units 110 and performing beam combination on the received laser light beams; the first array waveguide grating 1212 is connected to the second wavelength division multiplexer 1211, and the first array waveguide grating 1212 is configured to receive the laser beam combined by the second wavelength division multiplexer 1211 and split the received laser beam into light beams with different wavelengths.
That is, the input module 121 is composed of two parts, and the second wavelength division multiplexer 1211 is only used for combining the received single-frequency laser light of different wavelengths (frequencies) output by the plurality of single-frequency laser units 110, so as to facilitate transmission in the input module 121; the first array waveguide grating 1212 is only used for splitting the light wave combined by the second wavelength division multiplexer 1211, so as to be respectively transmitted to the subsequent selection module 122 for selection, thereby obtaining the laser with the target line width and outputting the laser from the output module 123.
In other embodiments, as shown in fig. 3, the input module 121 includes a second arrayed waveguide grating 1213, where the second arrayed waveguide grating 1213 is configured to receive the laser light output by the multiple single-frequency laser units 110, and split the received laser light into light beams with different wavelengths after combining the laser light beams. That is, the input module 121 is composed of only the second arrayed waveguide grating 1213, and the second arrayed waveguide grating 1213 can simultaneously realize the beam combination and the split after the beam combination of the laser light output from the plurality of single-frequency laser units 110, so that the structure of the wavelength selective switch 120 can be further simplified.
Optionally, the selecting module 122 includes a spatial light modulator 1221, where the spatial light modulator 1221 is configured to receive light beams with different wavelengths output by the input module 121, and adjust a phase of a wavelength of the received light beam to selectively filter the received light beam.
The spatial light modulator 1221 can be understood as a liquid crystal array, after the spatial light modulator 1221 receives light beams with different wavelengths output by the input module 121, the light with different wavelengths irradiates on different pixels, the polarization state of the light waves is adjusted by controlling the liquid crystal orientation of the corresponding pixels, the phase of the light waves is changed, and then the intensity of the output light is controlled by using an analyzer and the like, so that part of the light waves continue to be transmitted, and part of the light waves are filtered, thereby realizing the selection of the light waves with different wavelengths (frequencies).
Optionally, the output module 123 includes a third arrayed waveguide grating 1231, where the third arrayed waveguide grating 1231 is configured to receive the light beam selected by the selecting module 122 after filtering, and combine the received light beam for outputting. That is, the output module 123 is only composed of the third arrayed waveguide grating 1231, and the third arrayed waveguide grating 1231 is used for combining the filtered light waves selected by the selection module 122, so as to obtain and output the laser with the target line width.
Optionally, the single-frequency laser unit 110 includes a temperature control module 117, the laser resonator 113 is located in the temperature control module 117, and the temperature control module 117 is used for controlling the temperature of the laser resonator 113. The control accuracy of the temperature control module 117 is about 0.05 ℃, which is used for controlling the temperature of the phase shift grating 115 in the laser resonant cavity 113, so as to realize accurate tuning of the central wavelength (frequency) of the output laser of the single-frequency laser unit 110, and further improve the control accuracy of the line width of the final output laser of the fiber laser 100.
The single frequency laser unit 110 further includes a piezoelectric ceramic 118, and the piezoelectric ceramic 118 is connected to a side surface of the phase shift grating 115. The piezoelectric ceramic 118 can be PZT precision piezoelectric ceramic 118, and is attached to a side surface of the phase shift grating 115 by optical cement. The fiber laser 100 can effectively adjust the center wavelength (frequency) of the single-frequency laser output by the single-frequency laser unit 110 in real time by applying a direct-current bias voltage with a corresponding magnitude to the PZT precision piezoelectric ceramic 118 according to the specific requirement of the operating wavelength (frequency) of the laser output by the single-frequency laser unit 110.
It should be noted that, in the fiber laser 100 in the embodiment of the present application, by using a plurality of single-frequency laser units 110 with a short cavity structure, first, the center wavelength of the phase shift grating 115 of each laser resonant cavity 113 is selected, then the size of the working wavelength (frequency) interval between the laser resonant cavities 113 is determined, and then, in combination with a specific line width adjustment range and requirements, the working temperature of the laser resonant cavity 113 is precisely controlled by using the temperature control module 117, so that the output wavelength (frequency) of the laser resonant cavity 113 drifts, thereby changing the working wavelength (frequency) of each single-frequency laser unit 110 in a larger range. Meanwhile, in order to realize higher line width tuning precision, on the basis of using temperature tuning, a mode of PZT piezoelectric ceramics 118 is further combined, and a proper bias voltage signal is applied to the PZT precise piezoelectric ceramics 118 fixed on the phase shift grating 115 to change the period of the fiber grating, so that high-precision tuning of the working wavelength (frequency) of each single-frequency laser unit 110 is realized.
In addition, by arranging and combining different numbers of the single-frequency laser units 110, the single-frequency laser with a certain wavelength (frequency) difference output by each single-frequency laser unit 110 is recombined into one beam for output, and finally, the output laser has the advantages of flexible and controllable line width, large adjustment range, high precision and the like besides the characteristics of keeping the low noise, compact structure and the like of the original single-frequency laser.
Alternatively, the port type of the wavelength selective switch 120 in the embodiment of the present application can be n×1, where n is the number of input ports of the wavelength selective switch 120, and n is greater than or equal to 1,1 is the number of output ports of the wavelength selective switch 120, that is, the wavelength selective switch 120 has a plurality of input ports and one output port, and n single-frequency laser units 110 with different wavelength (frequency) differences are combined together and then output from the output ports.
In some embodiments, the wavelength selective switch 120 has a plurality of input ports and a plurality of output ports, the plurality of input ports are connected to the output ends of the plurality of single-frequency laser units 110 in a one-to-one correspondence manner, and the wavelength selective switch 120 is configured to receive the laser light output by the plurality of single-frequency laser units 110, and to selectively combine the received laser light and output the combined laser light from any one of the output ports. That is, after the wavelength selective switch 120 selectively combines the laser beams output by the plurality of single-frequency laser units 110, the laser beams can be selectively output from any one of the output ports according to the use situation, so as to meet different use requirements of the fiber laser 100, and further improve the applicability of the fiber laser 100.
The fiber laser 100 of the present application is further described below by way of specific examples, and it should be noted that the scope of the present application is not limited to the scope of the examples.
Specifically, the fiber laser 100 includes a phase shift grating 115, a precision piezoelectric ceramic 118, a temperature control module 117, a first wavelength division multiplexer 112, a pump source 111, an optical isolator 116, and a wavelength selective switch 120. The connection between the components is as follows: the phase shift grating 115 forms a laser resonant cavity 113, the phase shift grating 115 and the PZT precision piezoelectric ceramic 118 are tightly fixed together and connected with the common end of the first wavelength division multiplexer 112, and the laser resonant cavity 113 is placed in the temperature control module 117 for precise temperature control. The pumping end of the first wavelength division multiplexer 112 is connected with the tail fiber of the pumping source 111, the signal end of the first wavelength division multiplexer 112 is connected with the input end of the optical isolator 116, the components together form a single-frequency laser unit 110, and finally, single-frequency lasers output by a plurality of discrete single-frequency laser units 110 are combined into a beam of laser through the wavelength selective switch 120 and output.
Wherein the number of single-frequency laser units 110 is 3, and the laser working medium used by the laser resonant cavity 113 formed by the 3 phase shift gratings 115 is highly doped Yb 3+ A phosphate glass optical fiber having a use length of 50mm; the length of the grating region of the phase shift grating 115 is 40mm, the phase shift amount is pi, the phase shift grating 115 directly forms the laser resonant cavity 113, and the output center wavelengths are 1064.1nm, 1064.15nm and 1064.2nm respectively. The 3 PZT piezoelectric ceramics 118 are fixed on the side surfaces of the 3 phase shift gratings 115 respectively by ultraviolet curing glue, the 3 laser resonant cavities 113 are placed in specially customized copper tanks respectively, and the temperature control module 117 of a TEC refrigerator is used for precisely controlling the temperature of the whole laser resonant cavity 113, wherein the control precision is 0.05 ℃.
A single-mode semiconductor laser with the working wavelength of 976nm is selected as a pumping source 111, the pumping source 111 passes through a 980/1064nm first wavelength division multiplexer 112 and then returns to a pumping laser resonant cavity 113, and generated single-frequency laser is output through a 1064nm optical isolator 116. After obtaining stable single-frequency laser output, temperature control module 117 with the precision of 0.05 ℃ is used for temperature adjustment and control of laser resonant cavities 113, so that tuning of each laser resonant cavity 113 output wavelength in the range of 1-100 pm is realized; and in combination with applying a bias voltage signal to the PZT piezoelectric ceramic 118, the phase shift grating 115 is adjusted and controlled, so that precise tuning of the output wavelength of each laser resonator 113 within the range of 0.01-10 pm is further realized, and similar operations are respectively applied to the 3 laser resonators 113. The 3 single-frequency laser units 110 are selected to work simultaneously, single-frequency laser output by the 3 single-frequency laser units 110 is output after wave combination is carried out through a wavelength selection switch 120 (n multiplied by 1 port type), and finally, fiber laser output with the relative intensity noise value smaller than-130 dB/Hz and the line width tuning smaller than 15GHz can be obtained.
The foregoing has described in detail a fiber laser provided by embodiments of the present application, and specific examples have been used herein to illustrate the principles and embodiments of the present application, the above examples being provided only to assist in understanding the methods of the present application and their core ideas; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.
Claims (10)
1. The optical fiber laser is characterized by comprising a wavelength selection switch and a plurality of single-frequency laser units, wherein the output ends of the single-frequency laser units are connected with the wavelength selection switch; the wavelength selection switch is used for receiving the laser light output by the single-frequency laser units, and outputting the received laser light after selecting and combining the received laser light;
wherein the single frequency laser unit comprises:
a pump source;
the pumping end of the first wavelength division multiplexer is connected with the pumping source;
the laser resonant cavity is connected with the public end of the first wavelength division multiplexer;
the input end of the optical isolator is connected with the signal end of the first wavelength division multiplexer, and the output end of the optical isolator is connected with the wavelength selection switch.
2. The fiber laser of claim 1, wherein the single frequency laser unit comprises a gain fiber, the gain fiber being connected to a common port of the wavelength division multiplexer, the gain fiber having a phase shift grating inscribed thereon, the phase shift grating comprising the laser resonator.
3. The fiber laser of claim 2, wherein the gate region length of the phase shift grating is greater than or equal to 35mm and less than or equal to 45mm; the phase shift amount of the phase shift grating is pi.
4. The fiber laser of claim 1, wherein the wavelength selective switch comprises:
the input module is used for receiving the laser output by the single-frequency laser units and splitting the received laser into light beams with different wavelengths after combining the received laser beams;
the selection module is used for receiving the light beams with different wavelengths output by the input module and selecting and filtering the received light beams;
and the output module is used for receiving the light beams selected and filtered by the selection module, and outputting the received light beams after combining the light beams.
5. The fiber laser of claim 4, wherein the input module comprises:
the second wavelength division multiplexer is connected with the output ends of the single-frequency laser units and is used for receiving laser beams output by the single-frequency laser units and combining the received light beams;
the first array waveguide grating is connected with the second wavelength division multiplexer and is used for receiving the laser beams after the second wavelength division multiplexer is used for combining the laser beams and splitting the received laser beams into light beams with different wavelengths.
6. The fiber laser of claim 4, wherein the input module comprises a second arrayed waveguide grating, and the second arrayed waveguide grating is configured to receive the laser beams output by the plurality of single-frequency laser units, and split the received laser beams into beams with different wavelengths after combining the laser beams.
7. The fiber laser of claim 4, wherein the selection module includes a spatial light modulator for receiving the light beams of different wavelengths output by the input module and adjusting a phase of a wavelength of the received light beam to selectively filter the received light beam.
8. The fiber laser of claim 4, wherein the output module includes a third arrayed waveguide grating for receiving the light beam selected by the selection module and outputting the received light beam after combining.
9. The fiber laser of claim 2, wherein the single frequency laser unit further comprises a temperature control module and a piezoelectric ceramic, the laser resonator is located in the temperature control module, the temperature control module is used for controlling the temperature of the laser resonator, and the piezoelectric ceramic is connected with the side surface of the phase shift grating.
10. The fiber laser of claim 1, wherein the wavelength selective switch has a plurality of input ports and a plurality of output ports, the plurality of input ports being connected in one-to-one correspondence with the output ends of the plurality of single frequency laser units; the wavelength selection switch is used for receiving the laser light output by the single-frequency laser units, and outputting the laser light from any one of the output ports after selectively combining the received laser light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320856021.8U CN219419843U (en) | 2023-04-14 | 2023-04-14 | Optical fiber laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320856021.8U CN219419843U (en) | 2023-04-14 | 2023-04-14 | Optical fiber laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219419843U true CN219419843U (en) | 2023-07-25 |
Family
ID=87209329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320856021.8U Active CN219419843U (en) | 2023-04-14 | 2023-04-14 | Optical fiber laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219419843U (en) |
-
2023
- 2023-04-14 CN CN202320856021.8U patent/CN219419843U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110174661B (en) | Optical phased array two-dimensional laser radar scanning chip based on polarization multiplexing | |
| US5541947A (en) | Selectively triggered, high contrast laser | |
| EP1359686B1 (en) | Variable wavelength light source and optical amplifier using same | |
| US20220337017A1 (en) | Method for generating gigahertz bursts of pulses and laser apparatus thereof | |
| CN109149343A (en) | A kind of line width controllable optical fibre laser | |
| US6643060B2 (en) | Multi-wavelength light source utilizing acousto-optic tunable filter | |
| CN110867718B (en) | Wide-range high-precision narrow-linewidth optical fiber laser with adjustable linewidth | |
| CN113437627A (en) | Tunable multi-wavelength multiplexing spectrum modulation and separation system for high-power optical fiber laser amplification | |
| KR100345448B1 (en) | Dual wavelength fiber laser | |
| CN110676683B (en) | Acousto-optic electromechanical linkage multi-wavelength tunable synchronous light source | |
| JP2016018983A (en) | Wide-band wavelength variable laser | |
| CN219419843U (en) | Optical fiber laser | |
| US6836488B2 (en) | Cascaded Raman fiber laser, and optical system including such a laser | |
| CN110544864B (en) | Narrow linewidth fiber laser based on frequency modulation single-frequency seed source and four-wave mixing | |
| JP2021068823A (en) | Wavelength tunable light source, optical transmission apparatus using the same, and method of controlling wavelength tunable light source | |
| US6978064B2 (en) | Variable optical filter and optical transmission system using same, and method of controlling variable optical filter | |
| Yang et al. | Wideband true-time-delay system using fiber Bragg grating prism incorporated with a wavelength tunable fiber laser source | |
| JPH07263786A (en) | Mode synchronism laser device | |
| CN110994339A (en) | Wide-tuning narrow-linewidth all-solid-state Raman laser | |
| CN114552365B (en) | Spectrum domain and time domain programmable tuning laser and tuning method | |
| KR20190082618A (en) | a frequency variable multi-wavelength optical microwave filter | |
| KR100201009B1 (en) | Oscillating loop for optical control of erbium doped optical fiber amplifier gain | |
| CN116683271B (en) | Pulse width continuously adjustable fiber laser | |
| US20040208543A1 (en) | Multiplexer and pulse generating laser device | |
| CN116759877B (en) | Multi-wavelength laser with double resonant cavities |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |