CN215070850U - High repetition frequency linear polarization femtosecond mode-locked fiber laser - Google Patents
High repetition frequency linear polarization femtosecond mode-locked fiber laser Download PDFInfo
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Abstract
The utility model discloses a high repetition frequency linear polarization femto second mode locking fiber laser, including pumping laser and pumping protector, still include wavelength division multiplexer, short chamber length mode locking resonant cavity and output light isolator, the input of pumping protector is connected to the output of pumping laser, wavelength division multiplexer's pumping end is connected to the output of pumping protector, short chamber length mode locking resonant cavity is connected to wavelength division multiplexer's common port, wavelength division multiplexer's signal end connects the input of output light isolator, output light isolator's output is as high repetition frequency linear polarization femto second mode locking fiber laser's output. The utility model has the advantages of mode locking stability is good, simple structure and efficient.
Description
Technical Field
The utility model relates to a fiber laser technical field, more specifically say, in particular to high repetition frequency linear polarization femto second mode locking fiber laser.
Background
In recent years, high repetition frequency femtosecond lasers are widely applied to the fields of optical frequency combing, spectroscopy, optical communication, laser radar, nonlinear optics, dual/multiphoton microscopes and the like, and attract the deep research of a large number of scholars at home and abroad. In particular, in the field of spectroscopy, the higher repetition frequency of the femtosecond laser means that the higher the femtosecond laser comb spectral line power is at the same output power, which can bring higher test signal-to-noise ratio. At present, two technical means are mainly used for realizing a GHz high repetition frequency femtosecond laser, namely an active mode locking technology and a passive mode locking technology. Although the active mode locking can generate high repetition frequency femtosecond pulse output above GHz, an external high-frequency signal source or signal regeneration equipment is required, and the system cost and the structural complexity are increased. In addition, the active mode-locked laser needs to work at the harmonic frequency of integral multiple of the local oscillation frequency of the resonant cavity, and the long resonant cavity structure can introduce higher phase noise. In comparison, the passive mode-locking technology has the advantages of simple structure, high stability, low cost and the like, and can directly generate ultrashort laser output with pulse width of hundreds of femtoseconds, and a passive mode-locking GHz femtosecond laser is a hotspot direction of current research.
Solid laser lasers based on spatial coupling have enabled high repetition rate continuous mode-locked pulse output at repetition rates of 160 GHz. Compared with a space-coupled solid laser, the fiber mode-locked femtosecond laser has the advantages of more compact structure, low starting threshold, high light conversion efficiency, good light beam quality, no need of mechanical adjustment of a light path and the like. The laser is transmitted in the optical fiber to bring low loss and higher stability, and mode-locked femtosecond pulse output with the repetition frequency up to 1-20GHz is obtained by the design of a short cavity method.
The high repetition frequency femtosecond laser adopting the optical fiber system scheme adopts the linear short cavity method design, and almost all adopts a section of non-polarization-maintaining optical fiber as the gain optical fiber, thereby bringing about the problem that the mode locking state is unstable easily caused by the changes of vibration and temperature in the environment. The utilization of polarization maintaining devices in optical fiber technology is considered to be an effective method capable of resisting environmental interference, however, the use of traditional single-polarization optical fiber devices is limited by the short cavity length structure corresponding to high repetition frequency, so that related research reports of high repetition frequency femtosecond lasers adopting polarization maintaining fibers as gain fibers are very few. In 2020, a GHz high repetition frequency mode-locked fiber laser designed by adopting a polarization maintaining fiber is reported, the work adopts a resonant cavity prepared by exciting the polarization maintaining fiber by linear polarization pump light, and the output of linear polarization femtosecond laser with repetition frequencies of 1 and 2.2GHz is realized by utilizing the pumping difference of a fast axis and a slow axis in a resonant cavity gain fiber, but because the resonant cavity essentially supports dual-polarization operation of the fast axis light and the slow axis light, cross coupling of the light intensity of the fast axis and the slow axis light exists in the cavity in the time of high pump power, and mode locking is also unstable. How to obtain a GHz high repetition frequency femtosecond mode-locked fiber laser capable of working with high stability is still a technical difficulty faced by researchers at present.
In summary, the existing high repetition frequency femtosecond laser still has the following main problems: firstly, the femtosecond mode-locked laser system based on active mode locking has high cost and complex structure, needs an external signal source, and is easy to introduce higher phase noise into a long resonant cavity structure; secondly, although the solid femtosecond mode-locked laser based on passive mode locking can realize high repetition frequency, the space structure is relatively large, the stability is not high, and the efficiency needs to be improved; thirdly, a femtosecond mode-locked laser based on an optical fiber system mainly adopts a non-polarization-maintaining optical fiber as a gain optical fiber to realize a linear short cavity length design, and the mode-locked state of the laser is easily influenced by vibration and temperature change in the environment; and fourthly, a femtosecond mode-locked laser based on an optical fiber system adopts a polarization maintaining optical fiber as a linear short cavity length design of a gain optical fiber at present, and although GHz repetition frequency output is realized, because a resonant cavity essentially supports dual-polarization operation of fast axis light and slow axis light, when the pumping power is high enough, cross coupling of the light intensity of the fast axis and the slow axis light exists in the cavity, and the mode-locked state of the laser is also easily influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high repetition frequency linear polarization femto second mode locking fiber laser to overcome the defect that the mode locking stability that prior art exists is not enough, the structure is complicated, inefficiency.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a high-repetition-frequency linearly-polarized femtosecond mode-locked fiber laser comprises a pump laser, a pump protector, a wavelength division multiplexer, a short-cavity-length mode-locked resonant cavity and an output optical isolator, wherein the output end of the pump laser is connected with the input end of the pump protector, the output end of the pump protector is connected with the pump end of the wavelength division multiplexer, the common end of the wavelength division multiplexer is connected with the short-cavity-length mode-locked resonant cavity, the signal end of the wavelength division multiplexer is connected with the input end of the output optical isolator, and the output end of the output optical isolator is used as the output end of the high-repetition-frequency linearly-polarized femtosecond mode-locked fiber laser;
the short cavity and long mode locking resonant cavity comprises a first optical fiber ceramic insert head, a second optical fiber ceramic insert head, a 45-degree inclined fiber grating, a third optical fiber ceramic insert head, a semiconductor saturable absorption mirror, a polarization maintaining gain optical fiber, a dielectric film dichroscope and a ceramic sleeve, one end of the first optical fiber ceramic plug core head is connected with the common end of the wavelength division multiplexer, the other end of the first optical fiber ceramic plug core head is connected with one end of the second optical fiber ceramic plug core head which is plated with the dielectric film dichroic mirror through the ceramic sleeve, the other end of the second optical fiber ceramic ferrule is connected with one end of a third optical fiber ceramic ferrule through a polarization maintaining gain optical fiber carved with a 45-degree inclined optical fiber grating, the other end of the third optical fiber ceramic plug is connected with the semiconductor saturable absorption mirror through optical glue, and a short-cavity long resonant cavity is formed between the semiconductor saturable absorption mirror and the dielectric film dichroic mirror.
Further, the short cavity long mode-locking resonant cavity is a repetition frequency 1GHz short cavity long resonant cavity, and the length of the short cavity long resonant cavity between the first semiconductor saturable absorber mirror and the dielectric film dichroic mirror is 10 cm.
Further, the short cavity length mode-locked resonant cavity is a repetition frequency 3GHz short cavity length resonant cavity, and the length of the short cavity length resonant cavity between the first semiconductor saturable absorber mirror and the dielectric film dichroic mirror is 3.3 cm.
Furthermore, the high repetition frequency linear polarization femtosecond mode-locked fiber laser is of an all-fiber structure.
Furthermore, the optical fibers in the high repetition frequency linear polarization femtosecond mode-locked fiber laser are all of panda polarization-maintaining fiber structures.
Further, the pump laser is a single-mode continuous laser, a fiber laser or a fiber-coupled semiconductor laser.
Furthermore, the dielectric film dichroic mirror is of a multi-layer dielectric film structure and is evaporated on the end face of the second optical fiber ceramic plug head in a vacuum evaporation mode, the transmittance of the dielectric film dichroic mirror at the output wavelength of the pump laser is greater than 95%, and the reflectance of the dielectric film dichroic mirror at the output wavelength of the high-repetition-frequency linear polarization femtosecond mode-locked optical fiber laser is greater than 98%.
Further, the first fiber ceramic plug and the third fiber ceramic plug are FC/PC heads.
Further, the wavelength division multiplexer is a reflection type polarization maintaining wavelength division multiplexer, and the wavelength division range of the reflection type wavelength division multiplexer is 980nm/1550 nm.
Furthermore, the doped ions in the polarization maintaining gain fiber are Yb3、Er3+、Tm3+、Ho3+The gain coefficient of the first polarization maintaining gain fiber is more than 1 dB/cm.
Compared with the prior art, the utility model has the advantages of:
1. the utility model discloses select polarization maintaining fiber as gain fiber, compare with the scheme of selecting non-polarization maintaining fiber, the laser instrument is insensitive to ambient temperature and vibration change, and stability is higher.
2. The utility model discloses directly write 45 slope fiber grating on polarization gain optical fiber for the long mode locking resonant cavity of short chamber can only be in slow axis lasing, further improves the job stabilization nature of laser instrument, and the output laser instrument is linear polarization laser output simultaneously.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of the high repetition frequency linear polarization femtosecond mode-locked fiber laser of the present invention.
Fig. 2 is a structural diagram of a femtosecond mode-locked fiber laser with high repetition frequency of 1GHz according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the structure of the short-cavity long resonant cavity in fig. 2 according to the present invention.
Fig. 4 is a transmission spectrum of the dielectric film dichroic mirror of the present invention.
Fig. 5 is a schematic diagram of the polarization maintaining fiber ferrule of the present invention.
Fig. 6 is a structural diagram of a 3GHz high repetition frequency linear polarization femtosecond mode-locked fiber laser in the second embodiment of the present invention.
Fig. 7 is a schematic diagram of the structure of the short-cavity long-cavity resonator in fig. 6.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention can be more clearly and clearly defined.
Example one
Referring to fig. 1-5, this embodiment discloses a high repetition frequency linear polarization femtosecond mode-locked fiber laser, including pump laser 1 and pump protector 2, further including wavelength division multiplexer 3, short cavity length mode-locked resonant cavity and output optical isolator 5, the output of pump laser 1 is connected with the input of pump protector 2 through single mode polarization-maintaining fiber, the output of pump protector 2 is connected with the pump end of wavelength division multiplexer 3 through single mode polarization-maintaining fiber, the common port of wavelength division multiplexer 3 is connected with short cavity length mode-locked resonant cavity through single mode polarization-maintaining fiber, the signal port of wavelength division multiplexer 3 is connected with the input of output optical isolator 5 through single mode polarization-maintaining fiber, the output of output optical isolator 5 is as the output of high repetition frequency linear polarization femtosecond mode-locked fiber laser.
The short cavity length mode locking resonant cavity comprises a first optical fiber ceramic plug 41, a second optical fiber ceramic plug 42, a 45-degree inclined optical fiber grating 43, a third optical fiber ceramic plug 44, a semiconductor saturable absorption mirror 45, a polarization maintaining gain optical fiber 46, a dielectric film dichroic mirror 47 and a ceramic sleeve 48, one end of the first optical fiber ceramic plug 41 is connected with the common end of the wavelength division multiplexer 3, the other end of the first optical fiber ceramic plug 41 is connected with one end of the second optical fiber ceramic plug 42 plated with the dielectric film dichroic mirror 47 through a ceramic sleeve 48, the other end of the second optical fiber ceramic plug 42 is connected with one end of the third optical fiber ceramic plug 44 through a polarization maintaining gain optical fiber 46 carved with a 45-degree inclined optical fiber grating 43, the other end of the third optical fiber ceramic plug 44 is connected with the semiconductor saturable absorption mirror 45 through optical glue, and a short-cavity long resonant cavity is formed between the semiconductor saturable absorption mirror 45 and the dielectric film dichroic mirror 47.
Pump light output by a pump laser 1 is coupled into a short cavity long mode-locked resonant cavity through a pump protector 2 and a wavelength division multiplexer 3 in sequence; under the action of gradually increasing the power of the pump laser 1, the gain fiber in the resonant cavity absorbs the energy of the pump light to accumulate the stimulated radiation gain, the semiconductor saturable absorption mirror 45 carries out intensity modulation, and because the polarization-maintaining gain fiber is engraved with a 45-degree inclined fiber grating, the evolution process from spontaneous radiation, random lasing, Q-switched mode-locked lasing to continuous wave mode-locked lasing only occurs in the slow axis direction of the resonant cavity; after stable continuous wave mode-locked lasing is formed, a part of the generated GHz high-repetition-frequency linearly-polarized femtosecond mode-locked laser pulse is output through the dielectric film dichroic mirror 47, and is output after sequentially passing through the wavelength division multiplexer 3 and the output optical isolator 5.
The short cavity length mode-locking resonant cavity is a repetition frequency 1GHz short cavity length resonant cavity 4, and the length of the short cavity length resonant cavity between the first semiconductor saturable absorber mirror 45 and the dielectric film dichroic mirror 47 is 10 cm.
The first optical fiber ceramic plug 41, the second optical fiber ceramic plug 42 and the third optical fiber ceramic plug 44 are polarization maintaining optical fiber ceramic plugs, as shown in fig. 5, composed of a fiber core and a cladding 6 of panda polarization maintaining optical fiber, a coating layer 7 of panda polarization maintaining optical fiber and a ceramic layer 8, and the two ceramic plugs can be directly butt-coupled by ceramic sleeves.
The high repetition frequency linear polarization femtosecond mode-locked fiber laser is of an all-fiber structure.
The optical fibers in the high repetition frequency linear polarization femtosecond mode-locked optical fiber laser are all of panda polarization-maintaining optical fiber structures.
The pump protector 2 is used for preventing the generated ASE back-reflected light from damaging the pump laser, and the working wavelength of the pump laser 2 is positioned in an absorption band of gain fiber doped ions.
The pump laser 1 is a single-mode continuous laser, a fiber laser or a fiber-coupled semiconductor laser.
The dielectric film dichroic mirror 47 is of a multi-layer dielectric film structure, and is evaporated on the end face of the second optical fiber ceramic plug 42 by a vacuum evaporation method, the transmittance of the dielectric film dichroic mirror 47 at the output wavelength of the pump laser is greater than 95%, and the reflectance at the output wavelength of the high-repetition-frequency linear polarization femtosecond mode-locked fiber laser is greater than 98%.
The first fiber ceramic plug 41 and the third fiber ceramic plug 44 are FC/PC plugs.
The wavelength division multiplexer 3 is a reflection type polarization maintaining wavelength division multiplexer, and the wavelength division range of the reflection type wavelength division multiplexer is 980nm/1550 nm.
The polarization maintaining gain fiber 46 is doped with Yb3、Er3+、Tm3+、Ho3+The gain coefficient of the polarization maintaining gain fiber 46 is more than 1 dB/cm.
The 45-degree inclined fiber grating 43 is directly written on the polarization-maintaining gain fiber, the working wavelength of the grating is at the gain peak of the polarization-maintaining gain fiber, and the polarization contrast ratio of the fast axis and the slow axis is larger than 20 dB.
Example two
Referring to fig. 6 and 7, other structures of the present embodiment are the same as the embodiment, except that:
the short cavity length mode-locked resonant cavity in the embodiment is a repetition frequency 3GHz short cavity length resonant cavity 9, which comprises a first optical fiber ceramic plug 91, a second optical fiber ceramic plug 92, a 45-degree inclined optical fiber grating 93, a third optical fiber ceramic plug 94, a semiconductor saturable absorption mirror 95, a polarization-maintaining gain optical fiber 96, a dielectric film dichroic mirror 97 and a ceramic sleeve 98, wherein one end of the first optical fiber ceramic plug 91 is connected with a common end of the wavelength division multiplexer 3, the other end of the first optical fiber ceramic plug 91 is connected with one end of the second optical fiber ceramic plug 92 plated with the dielectric film dichroic mirror 97 through the ceramic sleeve 98, the other end of the second optical fiber ceramic plug 92 is connected with one end of a third optical fiber ceramic plug 94 through the polarization-maintaining gain optical fiber 96 engraved with the 45-degree inclined optical fiber grating 93, the other end of the third optical fiber ceramic plug 94 is connected with the semiconductor saturable absorption mirror 95 through optical glue, a short cavity and long resonant cavity is formed between the semiconductor saturable absorber mirror 95 and the dielectric film dichroic mirror 97, and the length of the short cavity and long resonant cavity between the semiconductor saturable absorber mirror 95 and the dielectric film dichroic mirror 97 is 3.3 cm.
Through shortening the linear cavity length of resonant cavity, the promotion of mode locking fiber laser repetition frequency of realization, pump laser 1 output pump light, pump laser 1 passes through single mode polarization maintaining fiber connection pump protector 2's input, pump protector 2's output passes through single mode polarization maintaining fiber connection wavelength division multiplexer 3's pump end, wavelength division multiplexer 3's common port passes through single mode polarization maintaining fiber connection repetition frequency 3GHz short chamber length mode locking resonant cavity 9, wavelength division multiplexer 3's signal end passes through single mode polarization maintaining fiber connection output optical isolator 5's input, output optical isolator 5's output 3GHz linear polarization femto second mode locking laser of repetition frequency.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, various changes and modifications can be made by the owner within the scope of the appended claims, and the protection scope of the present invention should not be exceeded by the claims.
Claims (10)
1. The utility model provides a high repetition frequency linear polarization femto second mode locking fiber laser which characterized in that: the output end of the output optical isolator is used as the output end of the high-repetition-frequency linear polarization femtosecond mode-locked fiber laser;
the short cavity and long mode locking resonant cavity comprises a first optical fiber ceramic insert head, a second optical fiber ceramic insert head, a 45-degree inclined fiber grating, a third optical fiber ceramic insert head, a semiconductor saturable absorption mirror, a polarization maintaining gain optical fiber, a dielectric film dichroscope and a ceramic sleeve, one end of the first optical fiber ceramic plug core head is connected with the common end of the wavelength division multiplexer, the other end of the first optical fiber ceramic plug core head is connected with one end of the second optical fiber ceramic plug core head which is plated with the dielectric film dichroic mirror through the ceramic sleeve, the other end of the second optical fiber ceramic ferrule is connected with one end of a third optical fiber ceramic ferrule through a polarization maintaining gain optical fiber carved with a 45-degree inclined optical fiber grating, the other end of the third optical fiber ceramic plug is connected with the semiconductor saturable absorption mirror through optical glue, and a short-cavity long resonant cavity is formed between the semiconductor saturable absorption mirror and the dielectric film dichroic mirror.
2. The high repetition frequency linearly polarized femtosecond mode-locked fiber laser according to claim 1, wherein: the short cavity length mode locking resonant cavity is a repetition frequency 1GHz short cavity length resonant cavity, and the length of the short cavity length resonant cavity between the semiconductor saturable absorber mirror and the dielectric film dichroic mirror is 10 cm.
3. The high repetition frequency linearly polarized femtosecond mode-locked fiber laser according to claim 1, wherein: the short cavity length mode locking resonant cavity is a repetition frequency 3GHz short cavity length resonant cavity, and the length of the short cavity length resonant cavity between the semiconductor saturable absorber mirror and the dielectric film dichroic mirror is 3.3 cm.
4. The high repetition frequency linearly polarized femtosecond mode-locked fiber laser according to claim 1, wherein: the high repetition frequency linear polarization femtosecond mode-locked fiber laser is of an all-fiber structure.
5. The high repetition frequency linearly polarized femtosecond mode-locked fiber laser according to claim 1, wherein: the optical fibers in the high repetition frequency linear polarization femtosecond mode-locked optical fiber laser are all of panda polarization-maintaining optical fiber structures.
6. The high repetition frequency linearly polarized femtosecond mode-locked fiber laser according to claim 1, wherein: the pump laser is a single-mode continuous laser, a fiber laser or a fiber-coupled semiconductor laser.
7. The high repetition frequency linearly polarized femtosecond mode-locked fiber laser according to claim 1, wherein: the dielectric film dichroic mirror is of a multi-layer dielectric film structure and is evaporated on the end face of the second optical fiber ceramic plug head in a vacuum evaporation mode, the transmittance of the dielectric film dichroic mirror at the output wavelength of the pump laser is larger than 95%, and the reflectance of the dielectric film dichroic mirror at the output wavelength of the high-repetition-frequency linear polarization femtosecond mode-locking optical fiber laser is larger than 98%.
8. The high repetition frequency linearly polarized femtosecond mode-locked fiber laser according to claim 1, wherein: the first optical fiber ceramic plug and the third optical fiber ceramic plug are FC/PC heads.
9. The high repetition frequency linearly polarized femtosecond mode-locked fiber laser according to claim 1, wherein: the wavelength division multiplexer is a reflection type polarization-preserving wavelength division multiplexer, and the wavelength division range of the reflection type wavelength division multiplexer is 980nm/1550 nm.
10. The high repetition frequency linearly polarized femtosecond mode-locked fiber laser according to claim 1, wherein: the doped ions in the polarization maintaining gain fiber are Yb3、Er3+、Tm3+、Ho3+Wherein the gain coefficient of the polarization maintaining gain fiber is larger than 1 dB/cm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113206427A (en) * | 2021-04-30 | 2021-08-03 | 中国人民解放军国防科技大学 | High repetition frequency linear polarization femtosecond mode-locked fiber laser |
| CN118630563A (en) * | 2024-08-09 | 2024-09-10 | 山东科技大学 | Inclined fiber grating cladding mode laser |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113206427A (en) * | 2021-04-30 | 2021-08-03 | 中国人民解放军国防科技大学 | High repetition frequency linear polarization femtosecond mode-locked fiber laser |
| CN118630563A (en) * | 2024-08-09 | 2024-09-10 | 山东科技大学 | Inclined fiber grating cladding mode laser |
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