CN205693131U - 240fs all-fiber Chirp pulse amplification laser system - Google Patents
240fs all-fiber Chirp pulse amplification laser system Download PDFInfo
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- CN205693131U CN205693131U CN201620615525.0U CN201620615525U CN205693131U CN 205693131 U CN205693131 U CN 205693131U CN 201620615525 U CN201620615525 U CN 201620615525U CN 205693131 U CN205693131 U CN 205693131U
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Abstract
This utility model relates to laser technology field, is specifically related to a kind of 240fs all-fiber Chirp pulse amplification laser system.This system includes signal laser source, fiber amplifier and the gratings compressor set gradually along light path.Signal laser source is all-fiber mode locking oscillator；Fiber amplifier uses MOPA Cascaded amplification structure, the gain fibre being incremented by step by step including the above core diameter of two-stage；Gratings compressor includes collimating lens, Amici prism, 1/2nd wave plates, the first grating, the second grating, corner cube prism and the plane mirror set gradually along light path.This utility model uses all-fiber chirped pulse amplification, without broadening, directly the flashlight of oscillator stage output is amplified, by controlling to amplify the B integration total amount of accumulation in transmitting procedure, conservative control system non-linear, and carry out effective dispersion management, it is achieved that 240 femtosecond narrow-pulse lasers outputs of the features such as the pulse width of system structure simplification, peak power height, spectral width are big.
Description
Technical field
The present invention relates to a kind of laser technology field, swash in particular to a kind of 240fs all-fiber chirped pulse amplification
Photosystem.
Background technology
Femtosecond laser has the features such as pulse width, peak power is high, spectral width is big, at ultra-fast nonlinear optical, terahertz
The basic research fields such as hereby ripple generation, femtochemistry have been obtained for being widely applied.The high-power femtosecond of the biggest energy
Laser, during due to it with matter interaction, heat effect is little, and processing does not has melting zone around aperture, to rapidoprint without selecting
The features such as property, in hyperfine processing, micro-photonic device manufacture, medical science delicate surgery, density three-dimensional optical storage, nano biological work
The fields such as journey, nanosecond medical science and national defence laser weapon have a wide range of applications.
The optical fiber Femtosecond Laser Amplification System of currently acquired high single pulse energy typically uses chirped pulse amplification (CPA) skill
Art, though the program can obtain the single pulse energy of MJ magnitude, but adds the complexity of laser system, improves cost, draw
Enter extra loss so that its practicality and cost performance are relatively low, are unfavorable for miniaturization.With above-mentioned technology compared to, at optical fiber
In CPA technology, " directly amplifying technology " of could be used without pulse stretcher has simpler structure.Directly oscillator stage is exported
Flashlight be amplified, ensureing while higher single pulse energy, simplifying the structure of system, and the flashlight of oscillator stage
During amplifying, light pulse, while obtaining gain, utilizes self phase modulation stretched-out spectrum, and relatively long
Gain fibre makes under the effect of positive dispersion the gradually linearisation of warbling in the middle part of pulse, narrower to the pulse after compression through grating,
Peak power improves further.But, due to the architectural characteristic of optical fiber self, when high-power ultrashort pulse is propagated in a fiber
Time, high peak power will necessarily evoke many nonlinear effects, causes impulse waveform to distort, and pulse both wings are carried on the back significantly
From parabola, form non-linear chirp, after grating compresses, produce substrate or secondary lobe, even if so pulse spectrum broadening obtains again
Width, pulse is narrowerly compressible, but the introducing of non-linear chirp also can reduce pulse quality, reduces effective energy, causes pulse
Peak power declines.
Summary of the invention
It is an object of the invention to provide a kind of all-fiber chirped pulse amplification, solve the output of high single pulse energy
Optical fiber Femtosecond Laser Amplification System structural complexity problem.
Embodiments providing a kind of 240fs all-fiber Chirp pulse amplification laser system, it includes depending on along light path
The signal laser source (1) of secondary setting, fiber amplifier (2) and gratings compressor (3)；Described fiber amplifier includes more than two-stage
The gain fibre that core diameter is incremented by step by step；Collimating lens (5) that described gratings compressor (3) includes setting gradually along light path,
Amici prism (6), 1/2nd wave plates (7), the first grating (8), the second grating (9), corner cube prism (10) and plane mirror (11).
In certain embodiments, being preferably, described signal laser source is fiber oscillator device based on SESAM locked mode, in line
Property cavity configuration.
In certain embodiments, be preferably, in described fiber oscillator device, described SESAM be packaged in two FC/PC wire jumpers it
Between, and pass through Flange joint.
In certain embodiments, being preferably, described fiber amplifier uses MOPA Cascaded amplification structure, depends on including along light path
The first order pre-amplification stage of secondary setting, second level pre-amplification stage, the main amplifier stage of third level power.
In certain embodiments, being preferably, the Yb dosed optical fiber of described first order pre-amplification stage is single covering.
In certain embodiments, being preferably, the Yb dosed optical fiber of described second level pre-amplification stage is large mode field double clad.
In certain embodiments, being preferably, the Yb dosed optical fiber of the described main amplifier stage of third level power is large mode field double clad.
In certain embodiments, being preferably, the Output of laser of described fiber amplifier enters compression after collimating lens
In device, focal length is 25mm；Described Amici prism is polarization splitting prism；Described plane mirror is 1um wave band of laser high reflective mirror.
In certain embodiments, being preferably, described corner cube prism is 45 ° of corner cube prisms, by the position of 45 ° of corner cube prisms
Make through grating pair laser again back through grating to once.
The 240fs all-fiber Chirp pulse amplification laser system that the embodiment of the present invention provides is compared with prior art, useful
Effect is:
This system uses the fiber amplifier of nonlinear pulse amplifying technique, realizes full light by fused fiber splice technique
Fibrillation, it is not necessary to stretcher, is directly amplified the flashlight of oscillator stage output, by controlling to amplify accumulation in transmitting procedure
B integration total amount, conservative control system non-linear, and carry out effective dispersion management, ensure what high single pulse energy exported
Meanwhile, system structure is simplified.Single pulse energy is high, system structure is simple, the most integrated.And, gratings compressor is direct
Use two gratings be arrangeding in parallel to be compressed, simplify compressibility structure, improve practicality and the cost performance of system.
It addition, use fiber oscillator device based on SESAM locked mode, simple in construction, pulse width are narrow, start can realize steady
Fixed self-starting, run a few hours during locked mode be constantly in steady statue.
Accompanying drawing explanation
Fig. 1 is the structural representation of whole system in one embodiment of the invention；
Fig. 2 is the structural representation of gratings compressor in one embodiment of the invention.
Note: 1, signal laser source；2, fiber amplifier；3, gratings compressor；4, end cap；5, collimating lens；6, light splitting rib
Mirror；7,1/2nd wave plate；8, the first grating；9, the second grating, 10 corner cube prisms；11, plane mirror.
Detailed description of the invention
Combine accompanying drawing below by specific embodiment the present invention is described in further detail.
The Fs chirp pulse laser amplification system structural complexity exported in view of high single pulse energy and all-fiber
The Femtosecond Laser Amplification System of structure exports the problems such as pulse energy is low, and the present invention provides a kind of 240fs all-fiber chirped pulse
Amplification laser system.
As it is shown in figure 1, specifically include:
Along the signal laser source 1 that light path sets gradually, fiber amplifier 2, gratings compressor 3；Wherein fiber amplifier bag
Include the gain fibre that the above core diameter of two-stage is incremented by step by step；Wherein gratings compressor 3 includes the collimation set gradually along light path
Lens 5, Amici prism 6,1/2nd wave plate the 7, first grating the 8, second grating 9, corner cube prism 10, plane mirror 11.
This system uses the fiber amplifier of nonlinear pulse amplifying technique, realizes all-fiber by fused fiber splice technique
Change, it is not necessary to stretcher, directly the flashlight of oscillator stage output is amplified, by controlling to amplify the B of accumulation in transmitting procedure
Integration total amount, conservative control system non-linear, and carry out effective dispersion management, ensure that high single pulse energy exports same
Time, simplify system structure.Single pulse energy is high, system structure is simple, the most integrated.And, gratings compressor is directly adopted
It is compressed with two gratings be arrangeding in parallel, simplifies compressibility structure, improve practicality and the cost performance of system.
It follows that this technology is described in detail:
In the present embodiment, the core technology of fiber amplifier is MOPA Cascaded amplification technology, the core unit of gratings compressor
Part is two gratings be arrangeding in parallel.
MOPA (master oscillation power amplification) Cascaded amplification technology achieves the full fibrillation structure of whole amplification laser instrument, passes through
Reasonably control the length of gain amplifier optical fiber at different levels, the size of core diameter and injection seeded to control in amplifier with energy gain
Nonlinear iterated process.The core size being incremented by each amplifier stage optical fiber in the present invention step by step carrys out the B integration in rational control system
Total amount, afterbody power master puts the large mode field Double Cladding Ytterbium Doped Fiber using big core diameter.The introduced details hands of large core fiber
Skill difficulty also can strengthen, and overcomes the welding problem of large core fiber in the present invention.Use this amplification mode that seed light is entered
Row amplifies, it is ensured that achieve again high power, high-energy output while the high light beam quality of output light.
The grating of pair of parallel placement can be as dispersive delay line, and with prism to the same, parallel two gratings can provide
One GVD (GVD) amount, it can align the light pulse warbled provides a unusual GVD to measure, thus to light pulse
Play compression.The advantage using two gratings be arrangeding in parallel maximum is can to provide bigger with less grating space
GVD dispersion measure, and its chromatic dispersion compensation quantity can regulate, and parallel two gratings itself do not produce material disperse.
In the present embodiment, signal laser source 1 is fiber oscillator device based on SESAM (semiconductor saturable absorber) locked mode,
Constituting linear cavity structure, flashlight vibrates in this resonator cavity back and forth, it is achieved stable continuous locking mold.SESAM is packaged in two
Between FC/PC wire jumper, being attached by flange, this packaged type is the packaged type of a kind of independent development, this kind of encapsulation side
Formula has passed through experimental verification, is fused in resonator cavity to realize stable continuous locking mold.Fiber amplifier includes two
The gain fibre that the above core diameter of level is incremented by step by step, selects three grades of MOPA Cascaded amplification technology, including along light in the present embodiment
First order pre-amplification stage that road sets gradually, second level pre-amplification stage, the main amplifier stage of third level power.First order pre-amplification stage
Gain fibre is single covering Yb dosed optical fiber, and the gain fibre of second level pre-amplification stage is large mode field Double Cladding Ytterbium Doped Fiber；3rd
The gain fibre of the level main amplifier stage of power is big core diameter large mode field Double Cladding Ytterbium Doped Fiber, and after two-stage pre-amplification, signal swashs
Light finally can be amplified to 20W at the main amplifier stage of third level power.As in figure 2 it is shown, after the output end cap 4 of fiber amplifier 2
Build a colimated light system, it is contemplated that the damage threshold at the first grating 8 and the second grating 9, the output of fiber amplifier 2
Being only added to 2W, in gratings compressor 3, first pulse laser collimates through aspheric collimation lens 5, then through polarization spectro
Prism 6, obtains horizontal polarization light or orthogonal polarized light, and horizontally or vertically the laser power of polarized light is about 1W, afterwards level or
Orthogonal polarized light passes through 1/2nd wave plates 7, obtains purer line polarized light, is finally injected into flat by pure line polarized light
First grating 8 of row setting and the second grating 9 compressibility carry out dispersion compensation.The laser light incident exported through the second grating arrives
After corner cube prism 10, by the position of 45 ° of corner cube prisms make through grating pair laser again back through grating to once, swash
Light is the most antiparallel through the second grating 9 and the first grating 8, reaches the purpose of twice dispersion compensation.Swash through 1um wave band after
Laser after light height antiplane mirror 11 output squeezing.By regulating incident angle and first grating 8 of incident illumination at the first grating
And the distance that second between grating 9, regulate compression effectiveness.Final is 19 ° at incident angle, and two grating vertical dimensions are 110mm
Time, obtaining optimal compression effectiveness, pulse width is compressed to 240fs by 3.5ps.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (9)
1. a 240fs all-fiber Chirp pulse amplification laser system, it is characterised in that include the signal set gradually along light path
Lasing light emitter (1), fiber amplifier (2) and gratings compressor (3)；Described fiber amplifier includes the above core diameter of two-stage step by step
The gain fibre being incremented by；Collimating lens (5) that described gratings compressor (3) includes setting gradually along light path, Amici prism (6),
/ 2nd wave plates (7), the first grating (8), the second grating (9), corner cube prism (10) and plane mirror (11).
2. 240fs all-fiber Chirp pulse amplification laser system as claimed in claim 1, it is characterised in that described signal swashs
Light source is fiber oscillator device based on SESAM locked mode, linearly cavity configuration.
3. 240fs all-fiber Chirp pulse amplification laser system as claimed in claim 2, it is characterised in that described optical fiber shakes
Swinging in device, described SESAM is packaged between two FC/PC wire jumpers, and passes through Flange joint.
4. 240fs all-fiber Chirp pulse amplification laser system as claimed in claim 1, it is characterised in that described optical fiber is put
Big device uses MOPA Cascaded amplification structure, including the first order pre-amplification stage set gradually along light path, second level pre-amplification stage, the
Three grades of main amplifier stages of power.
5. 240fs all-fiber Chirp pulse amplification laser system as claimed in claim 4, it is characterised in that the described first order
The Yb dosed optical fiber of pre-amplification stage is single covering.
6. 240fs all-fiber Chirp pulse amplification laser system as claimed in claim 4, it is characterised in that the described second level
The Yb dosed optical fiber of pre-amplification stage is large mode field double clad.
7. 240fs all-fiber Chirp pulse amplification laser system as claimed in claim 4, it is characterised in that the described third level
The Yb dosed optical fiber of the main amplifier stage of power is large mode field double clad.
8. the 240fs all-fiber Chirp pulse amplification laser system as described in any one of claim 1-7, it is characterised in that institute
The Output of laser stating fiber amplifier enters in gratings compressor after collimating lens, and focal length is 25mm；Described Amici prism
For polarization splitting prism；Described plane mirror is 1um wave band of laser high reflective mirror.
9. the 240fs all-fiber Chirp pulse amplification laser system as described in any one of claim 1-7, it is characterised in that institute
Stating corner cube prism is 45 ° of corner cube prisms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620615525.0U CN205693131U (en) | 2016-06-21 | 2016-06-21 | 240fs all-fiber Chirp pulse amplification laser system |
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| CN201620615525.0U CN205693131U (en) | 2016-06-21 | 2016-06-21 | 240fs all-fiber Chirp pulse amplification laser system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370011A (en) * | 2017-07-10 | 2017-11-21 | 中科先为激光科技（北京）有限公司 | Large-power optical fiber amplifier |
| CN107968307A (en) * | 2017-12-28 | 2018-04-27 | 北京工业大学 | Compensate the apparatus and method of positive B integrated phase shifts |
| CN109286125A (en) * | 2018-11-16 | 2019-01-29 | 青岛自贸激光科技有限公司 | A kind of efficient chirped pulse amplification system |
| CN109599738A (en) * | 2018-12-20 | 2019-04-09 | 武汉光至科技有限公司 | A kind of optical pulse compressor |
| CN111342322A (en) * | 2020-03-02 | 2020-06-26 | 中国科学院上海光学精密机械研究所 | Chirp pulse amplifier |
| CN111900596A (en) * | 2020-06-05 | 2020-11-06 | 山东大学 | Laser parameter adjusting system |
| CN112152066A (en) * | 2020-09-16 | 2020-12-29 | 飞秒激光研究中心（广州）有限公司 | Laser pulse energy amplification device and method and femtosecond laser |
| CN114498279A (en) * | 2022-04-07 | 2022-05-13 | 北京卓镭激光技术有限公司 | Laser device and system for metal surface strengthening |
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2016
- 2016-06-21 CN CN201620615525.0U patent/CN205693131U/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370011A (en) * | 2017-07-10 | 2017-11-21 | 中科先为激光科技（北京）有限公司 | Large-power optical fiber amplifier |
| CN107968307A (en) * | 2017-12-28 | 2018-04-27 | 北京工业大学 | Compensate the apparatus and method of positive B integrated phase shifts |
| CN109286125A (en) * | 2018-11-16 | 2019-01-29 | 青岛自贸激光科技有限公司 | A kind of efficient chirped pulse amplification system |
| CN109286125B (en) * | 2018-11-16 | 2021-03-16 | 青岛自贸激光科技有限公司 | Efficient chirped pulse amplification system |
| CN109599738A (en) * | 2018-12-20 | 2019-04-09 | 武汉光至科技有限公司 | A kind of optical pulse compressor |
| CN109599738B (en) * | 2018-12-20 | 2024-03-12 | 武汉光至科技有限公司 | Optical pulse compressor |
| CN111342322A (en) * | 2020-03-02 | 2020-06-26 | 中国科学院上海光学精密机械研究所 | Chirp pulse amplifier |
| CN111900596A (en) * | 2020-06-05 | 2020-11-06 | 山东大学 | Laser parameter adjusting system |
| CN112152066A (en) * | 2020-09-16 | 2020-12-29 | 飞秒激光研究中心（广州）有限公司 | Laser pulse energy amplification device and method and femtosecond laser |
| US11955762B2 (en) | 2020-09-16 | 2024-04-09 | Femtosecond Research Center Co., Ltd. | Laser pulse energy amplification device and method, and femtosecond laser |
| CN114498279A (en) * | 2022-04-07 | 2022-05-13 | 北京卓镭激光技术有限公司 | Laser device and system for metal surface strengthening |
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