CN114122876A - Ultrafast femto second fiber laser - Google Patents
Ultrafast femto second fiber laser Download PDFInfo
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- CN114122876A CN114122876A CN202111174051.2A CN202111174051A CN114122876A CN 114122876 A CN114122876 A CN 114122876A CN 202111174051 A CN202111174051 A CN 202111174051A CN 114122876 A CN114122876 A CN 114122876A
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- 239000000835 fiber Substances 0.000 title claims abstract description 36
- 230000003321 amplification Effects 0.000 claims abstract description 40
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 40
- 230000003287 optical effect Effects 0.000 claims abstract description 8
- 239000006185 dispersion Substances 0.000 claims abstract description 7
- 239000013307 optical fiber Substances 0.000 claims abstract description 5
- 238000005086 pumping Methods 0.000 claims description 8
- 239000006096 absorbing agent Substances 0.000 claims description 6
- 238000005253 cladding Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000010287 polarization Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0071—Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06733—Fibre having more than one cladding
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention relates to an ultrafast femtosecond fiber laser. Wherein, this laser instrument includes: the system comprises an oscillator module, a pre-amplification module, a main amplification module and a compressor module. The oscillator module is used for outputting seed light, the power of the seed light is improved through the pre-amplification module and the main amplification module, finally the pulse width is compressed through the compressor module, and the femtosecond pulse is output. The invention accurately controls the dispersion amount in the optical system by the dispersion management technology, avoids the traditional stretcher device, optimizes the optical path and reduces the overall cost. Meanwhile, the stability of the system is improved by the full polarization maintaining structure of the optical fiber.
Description
Technical Field
The invention relates to the field of lasers, in particular to an ultrafast femtosecond fiber laser.
Background
Laser light has been widely used in military and civil applications because of its excellent characteristics such as good directivity, high brightness, good monochromaticity, and high coherence. The femtosecond pulse laser is widely applied to various industries such as time-resolved spectroscopy, high-precision laser cutting, laser medical treatment and the like by virtue of the advantages of narrow pulse width, wide frequency spectrum, high peak power and the like. Laser mode locking is mainly divided into two types, namely active mode locking and passive mode locking. Compared with active mode locking, passive mode locking is less noisy and does not require complex and expensive electronic components.
In order to obtain high-power and high-energy femtosecond pulses, Chirped Pulse Amplification (CPA) technology is mainly adopted at present, i.e. pulse stretching is performed by using a dispersive optical component (such as an optical fiber, a fiber bragg grating or a pair of diffraction gratings). The stretched pulses can be amplified without the peak power becoming very high. Finally, the amplified pulses are compressed by another dispersive optical component (typically a pair of diffraction gratings), thus avoiding the damage to the amplifier caused by the high peak power generated during amplification.
In order to optimize the whole optical path and save cost, the invention optimizes the net dispersion amount in the system by the dispersion management technology, compared with the traditional CPA technology, the invention saves a pulse widening device, improves the stability of the system and provides convenience for further integrating the laser.
Disclosure of Invention
The embodiment of the invention provides an ultrafast femtosecond fiber laser, which optimizes a light path, reduces the cost, improves the system stability and provides convenience for further integration of the laser.
According to an aspect of an embodiment of the present invention, there is provided an ultrafast femtosecond fiber laser including: the system comprises an oscillator module, a pre-amplification module, a main amplification module and a compressor module. The oscillator module is used for outputting seed light, the power of the seed light is improved through the pre-amplification module and the main amplification module, finally the pulse width is compressed through the compressor module, and the femtosecond pulse is output.
The oscillator module comprises a saturable absorber, a first wavelength division multiplexer, a first pumping source, a first single-mode ytterbium-doped gain fiber and a chirped fiber Bragg grating. The saturable absorber is a self-made mode locking element, pump light of a first pumping source is coupled into the first single-mode ytterbium-doped gain optical fiber by using the first wavelength division multiplexer, the chirped fiber Bragg grating is a reflection type grating, and seed light is output by using the built oscillator module and enters the pre-amplification module.
The pre-amplification module comprises a first isolator, a second wavelength division multiplexer, a second pumping source and a second single-mode ytterbium-doped gain fiber. The seed light generated by the oscillator module firstly enters the second wavelength division multiplexer through the first isolator, and the pump light generated by the second pumping source and the second single-mode ytterbium-doped gain fiber are used for optical amplification and then enter the main amplification module.
The main amplification module comprises a second isolator, a beam combiner, a third pumping source, a double-cladding ytterbium-doped gain fiber and a fiber collimator. The laser passing through the pre-amplification module firstly enters the beam combiner through the second isolator, and then enters the compressor module after being optically amplified by using pump light generated by a third pump source and the double-cladding ytterbium-doped gain fiber.
The compressor module includes a first mirror, a pair of reflective gratings, and a second mirror. The purpose of adjusting the dispersion amount is achieved by adjusting the distance between the reflection-type grating pairs.
The invention has the advantages of reducing cost, improving system stability and providing convenience for further integration of the laser by optimizing the light path.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic diagram of an ultrafast femtosecond fiber laser.
Fig. 2 is a structural view of an ultrafast femtosecond fiber laser.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic diagram of an ultrafast femtosecond fiber laser, as shown in fig. 1, including: the system comprises an oscillator module, a pre-amplification module, a main amplification module and a compressor module. The oscillator module is used for outputting seed light, the power of the seed light is improved through the pre-amplification module and the main amplification module, finally the pulse width is compressed through the compressor module, and the femtosecond pulse is output.
Fig. 2 is a structural diagram of an ultrafast femtosecond fiber laser, wherein an oscillator module comprises a saturable absorber 101, a wavelength division multiplexer 102, a pump source 103, a single-mode ytterbium-doped gain fiber 104, and a chirped fiber bragg grating 105. The pre-amplification module comprises an isolator 201, a wavelength division multiplexer 202, a pump source 203 and a single-mode ytterbium-doped gain fiber 204. The main amplification module comprises an isolator 301, a beam combiner 302, a pump source 303, a double-clad ytterbium-doped gain fiber 304 and a fiber collimator 305. The compressor module comprises a mirror 401, a pair of reflective gratings 402, 403, a mirror 404.
In the oscillator module, a saturable absorber 101 is a self-made mode locking element, a wavelength division multiplexer 102 is used for coupling pump light of a pumping source 103 into 104 a single-mode ytterbium-doped gain fiber, a chirped fiber Bragg grating 105 is a reflective grating, and the built oscillator module is used for outputting seed light to enter the pre-amplification module. In the pre-amplification module, the seed light generated by the oscillator module firstly enters the wavelength division multiplexer 202 through the isolator 201, and the pump light generated by the pump source 203 and the single-mode ytterbium-doped gain fiber 204 are used for optical amplification, and then enter the main amplification module. In the main amplification module, the laser passing through the pre-amplification module firstly enters a beam combiner 302 through an isolator 301, and then enters a compressor module after being optically amplified by pump light generated by a pump source 303 and a double-clad ytterbium-doped gain fiber 304. In the compressor module, the purpose of adjusting the dispersion amount is achieved by adjusting the spacing between the reflective grating pairs 402, 403.
In the invention, the oscillator module, the pre-amplification module and the main amplification module all adopt full polarization maintaining optical fiber structures, and linear polarization ensures the stability of the whole system. By optimizing the light path, the cost is reduced, the system stability is improved, and convenience is provided for further integration of the laser.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A differential frequency ultrafast mid-infrared laser, comprising: the system comprises an oscillator module, a pre-amplification module, a main amplification module and a compressor module.
2. The oscillator module is used for outputting seed light, the power of the seed light is improved through the pre-amplification module and the main amplification module, finally the pulse width is compressed through the compressor module, and the femtosecond pulse is output.
3. The laser of claim 1, wherein the oscillator module comprises a saturable absorber, a first wavelength division multiplexer, a first pump source, a first single mode ytterbium-doped gain fiber, a chirped fiber bragg grating.
4. The saturable absorber is a self-made mode locking element, pump light of a first pumping source is coupled into the first single-mode ytterbium-doped gain optical fiber by using the first wavelength division multiplexer, the chirped fiber Bragg grating is a reflection type grating, and seed light is output by using the built oscillator module and enters the pre-amplification module.
5. The laser of claim 1, wherein the pre-amplification module comprises a first isolator, a second wavelength division multiplexer, a second pump source, and a second single-mode ytterbium-doped gain fiber.
6. The seed light generated by the oscillator module firstly enters the second wavelength division multiplexer through the first isolator, and the pump light generated by the second pumping source and the second single-mode ytterbium-doped gain fiber are used for optical amplification and then enter the main amplification module.
7. The laser of claim 1, wherein the primary amplification module comprises a second isolator, a beam combiner, a third pump source, a double-clad ytterbium-doped gain fiber, and a fiber collimator.
8. The laser passing through the pre-amplification module firstly enters the beam combiner through the second isolator, and then enters the compressor module after being optically amplified by using pump light generated by a third pump source and the double-cladding ytterbium-doped gain fiber.
9. The laser of claim 1, wherein the compressor module comprises a first mirror, a reflective grating pair, and a second mirror.
10. The purpose of adjusting the dispersion amount is achieved by adjusting the distance between the reflection-type grating pairs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111174051.2A CN114122876A (en) | 2021-10-09 | 2021-10-09 | Ultrafast femto second fiber laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111174051.2A CN114122876A (en) | 2021-10-09 | 2021-10-09 | Ultrafast femto second fiber laser |
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| Publication Number | Publication Date |
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| CN114122876A true CN114122876A (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111174051.2A Pending CN114122876A (en) | 2021-10-09 | 2021-10-09 | Ultrafast femto second fiber laser |
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| CN (1) | CN114122876A (en) |
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- 2021-10-09 CN CN202111174051.2A patent/CN114122876A/en active Pending
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Effective date of registration: 20240125 Address after: 215000 room 304, building 3, software park, No. 78, Keling Road, high tech Zone, Suzhou, Jiangsu Province Applicant after: Suzhou zhuoyuhui Photoelectric Technology Co.,Ltd. Country or region after: China Address before: Room 411, building B, industrial park, No. 3, Xinchuang Road, Daxin Town, Zhangjiagang, Suzhou, Jiangsu 215636 Applicant before: Suzhou mandette Photoelectric Technology Co.,Ltd. Country or region before: China |