CN117060208A - Mode-locked fiber laser - Google Patents
Mode-locked fiber laser Download PDFInfo
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- CN117060208A CN117060208A CN202311024754.6A CN202311024754A CN117060208A CN 117060208 A CN117060208 A CN 117060208A CN 202311024754 A CN202311024754 A CN 202311024754A CN 117060208 A CN117060208 A CN 117060208A
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- 239000000835 fiber Substances 0.000 title claims abstract description 156
- 230000010287 polarization Effects 0.000 claims abstract description 153
- 239000013307 optical fiber Substances 0.000 claims abstract description 61
- 239000006096 absorbing agent Substances 0.000 claims abstract description 35
- 230000003287 optical effect Effects 0.000 claims abstract description 5
- 230000005284 excitation Effects 0.000 claims description 12
- 238000005086 pumping Methods 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003913 materials processing Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- -1 transition metal chalcogenides Chemical class 0.000 description 1
Classifications
-
- 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
- H01S3/06791—Fibre ring lasers
-
- 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
-
- 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
- H01S3/06712—Polarising fibre; Polariser
-
- 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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08059—Constructional details of the reflector, e.g. shape
-
- 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
- H01S3/1118—Semiconductor saturable absorbers, e.g. semiconductor saturable absorber mirrors [SESAMs]; Solid-state saturable absorbers, e.g. carbon nanotube [CNT] based
Abstract
The invention provides a mode-locked fiber laser, which comprises a pumping source; a polarization maintaining fiber beam splitter, a polarization maintaining fiber circulator, a polarization maintaining gain fiber and a wavelength division multiplexer; a saturable absorber, a polarization control unit and an optical fiber end mirror; the polarization maintaining fiber beam splitter and the optical fiber end mirror form a resonant cavity, and the polarization maintaining fiber circulator, the polarization maintaining gain fiber, the wavelength division multiplexer, the saturable absorber and the polarization control unit are sequentially arranged on an optical path from the polarization maintaining fiber beam splitter to the optical fiber end mirror. The mode locking fiber laser improves the mode locking stability and has a simple structure.
Description
Technical Field
The invention relates to the technical field of semiconductors, in particular to a mode-locked fiber laser.
Background
Passive mode-locked fiber lasers have attracted more and more attention in the fields of telecommunications, metrology, and materials processing, among other applications. Various types of saturated absorbing materials have been extensively studied to activate mode locking such as semiconductor saturable absorbing mirrors (SESAMs), carbon nanotubes, two-dimensional (2D) nanomaterials (typically represented by graphene), topological insulators (ts), transition metal chalcogenides (TMDCs), and black phosphorus, among others. However, these materials tend to suffer from relatively low damage thresholds and performance degradation over time. Another approach to overcome the above difficulties is to induce artificial Saturation Absorber (SA) mechanisms based on nonlinear optical effects, including nonlinear polarization rotation (NPE) and Nonlinear Amplifying Loop Mirror (NALM); such an artificial sensor has the advantage of being independent of the laser operating wavelength and easy to implement. However, in the method of setting nonlinear polarization rotation, the polarization state must be carefully adjusted, and is easily disturbed by the environment, with poor stability; the nonlinear amplifying loop mirror is arranged to lead to complex structure and high design requirement.
Disclosure of Invention
The invention provides a mode-locked fiber laser, which aims to solve the problems of poor stability and complex structure of the mode-locked fiber laser in the prior art.
The invention provides a mode-locked fiber laser, which comprises a pumping source; a polarization maintaining fiber beam splitter, a polarization maintaining fiber circulator, a polarization maintaining gain fiber and a wavelength division multiplexer; a saturable absorber, a polarization control unit and an optical fiber end mirror; the polarization maintaining fiber beam splitter and the optical fiber end mirror form a resonant cavity, and the polarization maintaining fiber circulator, the polarization maintaining gain fiber, the wavelength division multiplexer, the saturable absorber and the polarization control unit are sequentially arranged on an optical path from the polarization maintaining fiber beam splitter to the optical fiber end mirror; the emitting end of the polarization maintaining optical fiber circulator is connected with the public end of the polarization maintaining optical fiber beam splitter through a first polarization maintaining optical fiber, the incident end of the polarization maintaining optical fiber circulator is connected with the signal end of the polarization maintaining optical fiber beam splitter through a second polarization maintaining optical fiber, and the emitting end of the polarization maintaining optical fiber beam splitter is used for outputting target laser; the public end of the polarization maintaining optical fiber circulator is connected with the signal end of the wavelength division multiplexer through a polarization maintaining gain optical fiber, the pump source is connected with the pump input end of the wavelength division multiplexer through a first non-polarization maintaining optical fiber, and the public end of the wavelength division multiplexer is connected with the saturable absorber through a third polarization maintaining optical fiber; the saturable absorber is connected with the polarization control unit through a second non-polarization-maintaining optical fiber, and the polarization control unit is connected with the optical fiber end mirror through a third non-polarization-maintaining optical fiber.
Optionally, the saturable absorber is a step index multimode optical fiber.
Optionally, the length of the step index multimode fiber is 14 cm-16 cm.
Optionally, the core of the step index multimode fiber has a diameter of 61 microns to 63 microns.
Optionally, the polarization-maintaining gain fiber comprises an ytterbium-doped polarization-maintaining gain fiber, an erbium-doped polarization-maintaining gain fiber or a thulium-doped polarization-maintaining gain fiber.
Optionally, the length of the polarization maintaining gain fiber is 78 cm-82 cm.
Optionally, when the polarization-maintaining gain fiber is ytterbium-doped polarization-maintaining gain fiber, the polarization-maintaining gain fiber generates gain light with a wavelength of 1065nm under the excitation of pump light with a wavelength of 976 nm; when the polarization-maintaining gain fiber is an erbium-doped polarization-maintaining gain fiber, the polarization-maintaining gain fiber generates 1560nm wavelength gain light under the excitation of 975nm wavelength pump light; when the polarization-maintaining gain fiber is the thulium-doped polarization-maintaining gain fiber, the polarization-maintaining gain fiber generates 2000nm wavelength gain light under the excitation of 793nm wavelength pump light.
Optionally, the ratio of the energy output by the signal end to the energy output by the emergent end of the polarization maintaining fiber beam splitter is 10: 85-10:92.
The technical scheme of the invention has the following beneficial effects:
according to the mode-locked fiber laser provided by the technical scheme of the invention, the pumping source outputs light to the pumping input end of the wavelength division multiplexer through the first non-polarization maintaining fiber, and the polarization maintaining gain fiber spontaneously radiates under the excitation of the pumping light to generate gain light. The common end of the gain light self-polarization maintaining optical fiber circulator generated by the polarization maintaining gain optical fiber is transmitted to the emergent end of the polarization maintaining optical fiber circulator, the emergent end of the self-polarization maintaining optical fiber circulator is transmitted to the common end of the polarization maintaining optical fiber beam splitter through the first polarization maintaining optical fiber, part of gain light extracted from the common end of the polarization maintaining optical fiber beam splitter is transmitted to the signal end of the polarization maintaining optical fiber beam splitter, the signal end of the gain light self-polarization maintaining optical fiber beam splitter is transmitted to the incident end of the polarization maintaining optical fiber circulator through the second polarization maintaining optical fiber, and the gain light and the wavelength division multiplexer sequentially pass through the polarization maintaining gain optical fiber and the wavelength division multiplexer after passing through the polarization maintaining optical fiber circulator. A laser cavity is formed between the saturable absorber and the polarization maintaining fiber beam splitter, laser irradiates the saturable absorber all the time when the laser oscillates in the laser cavity, the absorption coefficient of the saturable absorber to the laser decreases along with the increase of the light intensity, and when the saturable absorber absorbs the laser to reach saturation, the absorption is stopped and pulse laser is emitted, and the absorbed energy is released instantaneously. The absorption characteristics of the saturable absorber can be utilized to realize Q (switch) adjustment and mode locking of laser, and the ultra-short pulse output of the femtosecond level is realized. The pulse laser generated by the saturable absorber is transmitted to a polarization control unit, the polarization control unit is used for controlling the polarization state of the pulse laser to be single polarization state and consistent with the polarization state of the gain light, then the pulse laser is transmitted to the optical fiber end mirror to be reflected by the optical fiber end mirror, and the pulse laser reflected by the optical fiber end mirror passes through the polarization control unit, the saturable absorber, the wavelength division multiplexer, the polarization-maintaining gain fiber, the polarization-maintaining fiber circulator and the polarization-maintaining fiber beam splitter, resonates in a resonant cavity formed by the polarization-maintaining fiber beam splitter and the optical fiber end mirror, and is output from the emergent end of the polarization-maintaining fiber beam splitter. The stability of the mode-locked fiber laser is improved and the structure is simple.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a mode-locked fiber laser according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
An embodiment of the present invention provides a mode-locked fiber laser, referring to fig. 1, including:
a pump source 100;
polarization maintaining fiber splitter 110, polarization maintaining fiber circulator 120, polarization maintaining gain fiber 130 and wavelength division multiplexer 140; a saturable absorber 150, a polarization control unit 160, and a fiber end mirror 170; the polarization maintaining fiber beam splitter 110 and the fiber end mirror 170 form a resonant cavity, and the polarization maintaining fiber circulator 120, the polarization maintaining gain fiber 130, the wavelength division multiplexer 140, the saturable absorber 150 and the polarization control unit 160 are sequentially arranged on an optical path from the polarization maintaining fiber beam splitter 110 to the fiber end mirror 170.
The outgoing end of the polarization maintaining fiber circulator 120 is connected to the common end of the polarization maintaining fiber beam splitter 110 through a first polarization maintaining fiber 181, the incoming end of the polarization maintaining fiber circulator 120 is connected to the signal end of the polarization maintaining fiber beam splitter 110 through a second polarization maintaining fiber 182, and the outgoing end of the polarization maintaining fiber beam splitter 110 is used for outputting target laser; the common end of the polarization maintaining fiber circulator 120 is connected with the signal end of the wavelength division multiplexer 140 through a polarization maintaining gain fiber 130, the pump source 100 is connected with the pump input end of the wavelength division multiplexer 140 through a first non-polarization maintaining fiber 190, and the common end of the wavelength division multiplexer 140 is connected with the saturable absorber 150 through a third polarization maintaining fiber; the saturable absorber 150 is connected with the polarization control unit 160 by adopting a second non-polarization maintaining fiber, and the polarization control unit 160 is connected with the optical fiber end mirror 170 by adopting a third non-polarization maintaining fiber.
The pump source 100 may be a laser diode.
The pump source 100 and the wavelength division multiplexer 140 are coupled. Specifically, the pump source 100 outputs light to the pump input of the wavelength division multiplexer 140 through the first non-polarization maintaining fiber 190. The wavelength division multiplexer 140 has a selective reflector, where the selective reflector is adapted to reflect the pump light emitted from the pump source 100, and the selective reflector is adapted to transmit the gain light excited by the polarization maintaining gain fiber 130. The selective mirror is adapted to transmit the gain light transmitted from the saturable absorber 150 to the wavelength division multiplexer 140. The selective mirror is adapted to transmit gain light transmitted from the polarization maintaining gain fiber 130 through the wavelength division multiplexer 140 to the saturable absorber 150.
In one embodiment, the pump light output by the pump source 100 is reflected by the selective mirror to the signal end of the wavelength division multiplexer 140 and enters the polarization maintaining gain fiber 130, and the polarization maintaining gain fiber 130 spontaneously radiates under the excitation of the pump light to generate the gain light.
The polarization maintaining gain fiber 130 comprises an ytterbium-doped polarization maintaining gain fiber, an erbium-doped polarization maintaining gain fiber or a thulium-doped polarization maintaining gain fiber. When the polarization maintaining gain fiber 130 is an ytterbium-doped polarization maintaining gain fiber, the polarization maintaining gain fiber generates a gain light with a wavelength of 1065nm under the excitation of a pump light with a wavelength of 976 nm. When the polarization maintaining gain fiber 130 is an erbium-doped polarization maintaining gain fiber, the polarization maintaining gain fiber generates a gain light with 1560nm wavelength under the excitation of a pump light with 975nm wavelength. When the polarization maintaining gain fiber 130 is a thulium doped polarization maintaining gain fiber, the polarization maintaining gain fiber generates 2000nm wavelength gain light under the excitation of 793nm wavelength pump light.
The direction of laser light transmitted by the polarization maintaining fiber circulator 120 is: the common end of the self-polarization fiber circulator 120 is connected to the outgoing end of the self-polarization fiber circulator 120, and the incident end of the self-polarization fiber circulator 120 is connected to the common end of the self-polarization fiber circulator 120.
The self-radiation of the polarization maintaining gain fiber 130 under the excitation of the pump light generates a gain light, the public end of the self-polarization fiber circulator 120 of the gain light generated by the polarization maintaining gain fiber 130 is transmitted to the emitting end of the self-polarization fiber circulator 120, the emitting end of the self-polarization fiber circulator 120 is transmitted to the public end of the polarization maintaining fiber beam splitter 110 through the first polarization maintaining fiber 181, part of the gain light extracted from the public end of the polarization maintaining fiber beam splitter 110 is transmitted to the signal end of the polarization maintaining fiber beam splitter 110, the signal end of the gain light self-polarization fiber beam splitter 110 is transmitted to the incident end of the polarization maintaining fiber circulator 120 through the second polarization maintaining fiber 182, and the signal end of the gain light self-polarization fiber beam splitter 110 sequentially passes through the polarization maintaining fiber 130 and the wavelength division multiplexer 140 after passing through the polarization maintaining fiber circulator 120.
The principle of operation of the saturable absorber 150 is as follows: a laser cavity is formed between the saturable absorber 150 and the polarization maintaining fiber beam splitter 110, laser irradiates the saturable absorber 150 all the time when the laser oscillates in the laser cavity, the absorption coefficient of the saturable absorber 150 to the laser decreases along with the increase of the light intensity, and when the saturable absorber 150 absorbs the laser to reach saturation, the absorption is stopped and pulse laser is emitted, and the absorbed energy is released instantaneously. The absorption characteristics of the saturable absorber 150 can be used to realize Q (switching) and mode locking of laser light, and to realize femtosecond-level ultrashort pulse output.
The pulse laser generated by the saturable absorber 150 is transmitted to the polarization control unit 160, the polarization control unit 160 is used for controlling the polarization state of the pulse laser to be in a single polarization state and consistent with the polarization state of the gain light, then the pulse laser is transmitted to the optical fiber end mirror 170, reflected by the optical fiber end mirror 170, passes through the polarization control unit 160, the saturable absorber 150, the wavelength division multiplexer 140, the polarization maintaining gain fiber 130, the polarization maintaining fiber circulator 120 and the polarization maintaining fiber beam splitter 110, and resonates in a resonant cavity formed by the polarization maintaining fiber beam splitter 110 and the optical fiber end mirror 170, and is output from the output end of the polarization maintaining fiber beam splitter 110.
In one embodiment, the saturable absorber 150 is a step index multimode optical fiber.
In one embodiment, the step index multimode optical fiber has a length of 14cm to 16cm, such as 15cm.
In one embodiment, the core of the step index multimode fiber has a diameter of 61 microns to 63 microns, such as 62.5 microns.
In one embodiment, the polarization maintaining gain fiber 130 has a length of 78cm to 82cm, for example 80cm.
In one embodiment, the ratio of the energy output by the signal end and the energy output by the emergent end of the polarization maintaining fiber beam splitter is 10: 85-10:92, e.g. 10:90.
the mode-locked fiber laser has the advantages of improved stability, simple structure, 0.5% of power stability and 1.03ps of time jitter.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (8)
1. A mode-locked fiber laser, comprising:
a pump source;
a polarization maintaining fiber beam splitter, a polarization maintaining fiber circulator, a polarization maintaining gain fiber and a wavelength division multiplexer; a saturable absorber, a polarization control unit and an optical fiber end mirror; the polarization maintaining fiber beam splitter and the optical fiber end mirror form a resonant cavity, and the polarization maintaining fiber circulator, the polarization maintaining gain fiber, the wavelength division multiplexer, the saturable absorber and the polarization control unit are sequentially arranged on an optical path from the polarization maintaining fiber beam splitter to the optical fiber end mirror;
the emitting end of the polarization maintaining optical fiber circulator is connected with the public end of the polarization maintaining optical fiber beam splitter through a first polarization maintaining optical fiber, the incident end of the polarization maintaining optical fiber circulator is connected with the signal end of the polarization maintaining optical fiber beam splitter through a second polarization maintaining optical fiber, and the emitting end of the polarization maintaining optical fiber beam splitter is used for outputting target laser; the public end of the polarization maintaining optical fiber circulator is connected with the signal end of the wavelength division multiplexer through a polarization maintaining gain optical fiber, the pump source is connected with the pump input end of the wavelength division multiplexer through a first non-polarization maintaining optical fiber, and the public end of the wavelength division multiplexer is connected with the saturable absorber through a third polarization maintaining optical fiber; the saturable absorber is connected with the polarization control unit through a second non-polarization-maintaining optical fiber, and the polarization control unit is connected with the optical fiber end mirror through a third non-polarization-maintaining optical fiber.
2. The mode-locked fiber laser of claim 1, wherein the saturable absorber is a step index multimode fiber.
3. The mode-locked fiber laser of claim 2, wherein the step index multimode fiber has a length of 14cm to 16cm.
4. The mode-locked fiber laser of claim 2, wherein the core of the step index multimode fiber has a diameter of 61 microns to 63 microns.
5. The mode-locked fiber laser of claim 1, wherein the polarization maintaining gain fiber comprises an ytterbium-doped polarization maintaining gain fiber, an erbium-doped polarization maintaining gain fiber, or a thulium-doped polarization maintaining gain fiber.
6. The mode-locked fiber laser of claim 1 or 5, wherein the polarization maintaining gain fiber has a length of 78cm to 82cm.
7. The mode-locked fiber laser of claim 5, wherein when the polarization maintaining gain fiber is an ytterbium-doped polarization maintaining gain fiber, the polarization maintaining gain fiber generates a gain light of 1065nm wavelength under the excitation of a pump light of 976nm wavelength; when the polarization-maintaining gain fiber is an erbium-doped polarization-maintaining gain fiber, the polarization-maintaining gain fiber generates 1560nm wavelength gain light under the excitation of 975nm wavelength pump light;
when the polarization-maintaining gain fiber is the thulium-doped polarization-maintaining gain fiber, the polarization-maintaining gain fiber generates 2000nm wavelength gain light under the excitation of 793nm wavelength pump light.
8. The mode-locked fiber laser of claim 1, wherein the ratio of the energy output from the signal end to the energy output from the output end of the polarization maintaining fiber beam splitter is 10: 85-10:92.
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| CN115632299A (en) * | 2022-10-24 | 2023-01-20 | 深圳大学 | High-energy mode-locked fiber pulse laser |
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Application publication date: 20231114 |