CN201210577Y - Nanosecond grade laser pulse regenerative amplifier - Google Patents
Nanosecond grade laser pulse regenerative amplifier Download PDFInfo
- Publication number
- CN201210577Y CN201210577Y CNU2008200565878U CN200820056587U CN201210577Y CN 201210577 Y CN201210577 Y CN 201210577Y CN U2008200565878 U CNU2008200565878 U CN U2008200565878U CN 200820056587 U CN200820056587 U CN 200820056587U CN 201210577 Y CN201210577 Y CN 201210577Y
- Authority
- CN
- China
- Prior art keywords
- laser pulse
- regenerative amplifier
- suffix
- output
- pulse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Abstract
A nanosecond level laser pulse regeneration amplifier comprises a postfix pulse regeneration unit, a regeneration amplifier unit and an electric-optical isolator, wherein the laser pulse with postfix which is output by the postfix pulse regeneration unit, is input into the regeneration amplifier unit by an optical fiber and the laser pulse output by the regeneration amplifier unit is output by the electric-optical isolator. The laser pulse with postfix is input into the regeneration amplifier unit, the waveform distortion of amplified seed laser pulse is reduced and the pulse amplification of waveform distortion in low time domain with high stability is realized.
Description
Technical field
The utility model relates to laser, particularly a kind of nano second laser pulse regeneration amplifier.It can realize the amplification of high stable, high-gain, and causes the distortion of laser pulse time domain waveform by additional suffix pulse method reduction by the amplifier gain saturation effect.
Background technology
The output laser pulse energy stability and the distortion of output laser pulse time domain waveform of regenerative amplifier that is used to amplify nano second laser pulse is conflicting.Do not considering under the gain saturation situation, in the process that laser pulse repeatedly amplifies in the regenerative amplifier chamber, the fluctuation that regenerative amplifier self is introduced is along with the increase of amplifying number of passes is constantly accumulated, therefore, along with the increase of amplifying number of passes, the output laser pulse energy stability descends.But along with the continuous amplification of laser pulse, the gain media energy storage constantly consumes, and amplifier progresses into the gain saturation state.Enter in the process of gain saturation state at amplifier, the output laser pulse energy stability of regenerative amplifier is subjected to the inhibition of energy level energy storage on the amplifier gain medium and tends towards stability.Therefore, in order to obtain stable output, regenerative amplifier must operate at nearly gain saturation state.But because the gain saturation effect, when regenerative amplifier was operated in nearly gain saturation state, the pulse front portion had obtained bigger gain coefficient than the rear portion, so the distortion of output laser pulse time waveform.We use always at this square wave distortion (square-pulse distortion abbreviates SPD as) characterizes this because the distortion that the gain saturation effect causes, the square wave distortion is expressed as the ratio on square-wave pulse forward position with the edge, back of distortion.Can carry out precompensation to it by the time domain waveform of adjusting the seed shaped laser pulses.But excessive time waveform distortion has increased the difficulty and the accuracy of precompensation.
Summary of the invention
Problem to be solved in the utility model provides a kind of nano second laser pulse regeneration amplifier, under the precondition that guarantees regenerative amplifier stable operation, reduces seed laser pulse and is reproduced the time waveform distortion that produces in the amplifier amplification process.
Technical solution of the present utility model is as follows:
A kind of nano second laser pulse regeneration amplifier, be characterized in constituting by suffix pulse generation unit, regenerative amplifier unit and electric light isolator, the laser pulse of the band suffix of described suffix pulse generation unit output is imported described regenerative amplifier unit by optical fiber, and the laser pulse of described regenerative amplifier unit output is exported through described electric light isolator.
Described suffix pulse generation unit is by a 3dB beam splitter, the 2nd 3dB beam splitter, fiber segment and attenuator are formed, its position relation is: seed laser pulse is imported a 3dB fiber optic splitter, an output of the one 3dB fiber optic splitter and an input of described the 2nd 3dB fiber optic splitter join, another output of the one 3dB fiber optic splitter joins by described fiber segment and attenuator, another input of the output of this attenuator and described the 2nd 3dB fiber optic splitter joins, and is made up of seed laser pulse and the suffix laser pulse that adds thereafter the laser pulse of the band suffix of described the 2nd 3dB fiber optic splitter output.
Described regenerative amplifier unit comprises an optics cavity, the laser pulse of described band suffix inserts through described optical fiber, and import described optics cavity by aspheric surface convex lens, 1/2nd wave plates, first faraday isolator, spherical convex lens and second faraday isolator successively, described optics cavity constitutes stable cavity by first total reflective mirror, convex lens and second total reflective mirror, in this optics cavity, first electrooptical switching and quarter-wave plate are arranged between first total reflective mirror and the convex lens, between the convex lens and second total reflective mirror described gain media is set.
Described optics cavity is folded by the 3rd total reflective mirror, the 4th total reflective mirror, the 5th total reflective mirror.
Described electric light isolator is connected in sequence by the first film polarizer, second electrooptical switching and the second film polarizer, the normal of the described the first film polarizer and the second film polarizer becomes Brewster's angle with the light transmission direction, and the Surface Vertical of the first film polarizer is in the surface of the second film polarizer.
By adjusting the length of described fiber segment, can change the time interval between described suffix laser pulse and the seed laser pulse.
Described regenerative amplifier unit uses is excited to amplify the gain media that wavelength and seed laser pulse wavelength are complementary.Described gain media uses suitable pump mode.Described regenerative amplifier unit output laser signal reflects from second faraday isolator.
Comprise an electrooptical switching and a quarter-wave plate in the described optics cavity.The variation of polarization direction by control laser realizes importing and the derivation of described regenerative amplifier to laser pulse.
Described regenerative amplifier cell operation can realize stable amplification to the laser pulse of ns level pulsewidth at nearly gain saturation state.
The time width of the unlatching by controlling described electrooptical switching is controlled laser pulse and come and go the number of times that amplifies in described optics cavity, guarantees that described regenerative amplifier cell operation is at nearly gain saturation state.
The time interval of described suffix laser pulse and seed laser pulse and pulsewidth must guarantee that both together are imported into described regenerative amplifier unit and are exaggerated.Described suffix laser pulse is suppressed by described electric light isolator from regenerative amplifier output back.
Technique effect of the present utility model:
The utility model nano second laser pulse regeneration amplifier adopts the method in additional suffix pulse, has reduced the time waveform distortion that regenerative amplifier produces in amplifying the seed laser pulse process.Experiment shows, the laser pulse of input regenerative amplifier different time width, and square wave distortion variable quantity is very little, and promptly time wave distortion degree is more approaching.The utility model has reduced seed laser pulse and has been reproduced the time waveform distortion that produces in the amplifier amplification process under the precondition that guarantees regenerative amplifier stable operation.It is the regenerative amplifier of a kind of high stable, low time domain waveform distortion.
Description of drawings
Fig. 1 is the utility model nano second laser pulse regeneration amplifier structured flowchart.
Fig. 2 is the structural representation of regenerative amplifier unit in the utility model.
Fig. 3 is the electric light isolator schematic diagram in the utility model.
Fig. 4 is a suffix pulse generation unit schematic diagram in the utility model.
Embodiment
The utility model is described in further detail below in conjunction with embodiment and accompanying drawing, but should not limit protection range of the present utility model with this.
See also Fig. 1 earlier, Fig. 1 is the utility model nano second laser pulse regeneration amplifier structured flowchart.As seen from the figure, the utility model nano second laser pulse regeneration amplifier, constitute by suffix pulse generation unit 24, regenerative amplifier unit 1 and electric light isolator 2, the laser pulse of the band suffix of described suffix pulse generation unit 24 outputs is by the described regenerative amplifier of optical fiber 3 inputs unit 1, and the laser pulse of described regenerative amplifier unit 1 output is through described electric light isolator 2 outputs.
Fig. 4 is a suffix pulse generation unit schematic diagram in the utility model.Described suffix pulse generation unit 24 is by a 3dB beam splitter 25, the 2nd 3dB beam splitter 26, fiber segment 28 and attenuator 27 are formed, its position relation is: seed laser pulse 4 inputs the one 3dB fiber optic splitter 25, an output of the one 3dB fiber optic splitter 25 and an input of described the 2nd 3dB fiber optic splitter 26 join, another output of the one 3dB fiber optic splitter 25 joins with attenuator 27 by described fiber segment 28, another input of the output of this attenuator 27 and described 3dB fiber optic splitter 26 joins, and is made up of seed laser pulse 4 and the suffix laser pulse 5 that adds thereafter the laser pulse of the band suffix of described the 2nd 3dB fiber optic splitter 26 output.
Fig. 2 is the structural representation of regenerative amplifier unit in the utility model.Described regenerative amplifier unit 1 comprises an optics cavity 7, laser signal inserts through described optical fiber 3, and successively by aspheric surface convex lens 19, / 2nd wave plates 21, first faraday isolator 22, spherical convex lens 20 and the described optics cavity 7 of second faraday isolator, 23 inputs, described optics cavity 7 is by first total reflective mirror 9, the convex lens 8 and second total reflective mirror 10 constitute stable cavity, in this optics cavity, first electrooptical switching 14 and quarter-wave plate 15 are arranged between first total reflective mirror 9 and convex lens 8, between the convex lens 8 and second total reflective mirror 10, described gain media 6 is set.Fold by the 3rd total reflective mirror 11, the 4th total reflective mirror 12, the 5th total reflective mirror 13 in the described optics cavity 7 of present embodiment kind, with the spatial dimension of reduction means.
Referring to Fig. 3, Fig. 3 is the electric light isolator schematic diagram in the utility model.Described electric light isolator 2 is connected in sequence by the first film polarizer 16, second electrooptical switching 18 and the second film polarizer 17, the normal of the described the first film polarizer 16 and the second film polarizer 17 becomes Brewster's angle with the light transmission direction, and the Surface Vertical of the first film polarizer 16 is in the surface of the second film polarizer 17.
The seed laser pulse of input the utility model regenerative amplifier and the time interval between the suffix laser pulse must satisfy 2 points: 1, the laser pulse of the band suffix of seed laser pulse and suffix pulse composition can intactly be imported into regenerative amplifier unit 1; 2, owing to after the suffix pulse exports from regenerative amplifier, eliminated by photoisolator 2, thus should the time interval must be greater than the trailing edge time of second electrooptical switching (18).By adjusting the length of fiber segment 8, to obtain the time interval between suitable seed laser pulse and the suffix laser pulse; The attenuation multiple of control attenuator 27 is to adjust the relative amplitude of suffix pulsion phase for seed laser.Insert two-way electricity triggering signal, trigger first electrooptical switching 14 of gain media 6 pumpings and regenerative amplifier unit 1 respectively, and guarantee when laser signal arrives gain media 6 have suitable on energy level population; Guarantee that triggering it immediately after the input laser pulse comes and goes by first electrooptical switching 14 for the first time opens.Open time width control laser pulse by first electrooptical switching 14 and come and go the number of times that amplifies in regenerative amplifier, be operated in nearly gain saturation state to guarantee regenerative amplifier unit 1, can obtain maximum output laser pulse energy this moment.The laser pulse of regenerative amplifier unit 1 output is incident electric light isolator 2 immediately.When second electrooptical switching 18 is not opened, the first film polarizer 16 and the second film polarizer, 17 printing opacity polarization direction quadratures, laser signal can not pass through photoisolator 2; When second electrooptical switching 18 was opened, laser signal was by it, and the polarization direction half-twist is so laser signal will be by photoisolator 2.Adjust time and time width that second electrooptical switching 18 is opened, guarantee that seed laser pulse 4 passes through, to eliminate suffix pulse 5.Can use the square wave laser pulse as seed laser pulse, measure the square wave distortion of regenerative amplifier output laser pulse, to verify the improvement effect of this invention the time domain waveform distortion.
For example: a laser diode-pumped Nd:YLF regenerative amplifier.Use laser diode-pumpedly, gain media 6 is Nd:YLF crystal, and being excited to amplify wavelength is 1053nm.The seed laser pulse wavelength is 1053nm, maximum pulse width 3ns.The chamber of optics cavity 7 is long to be 4m, and laser pulse comes and goes week age in the chamber be 27ns, and seed laser pulse 4 is a 3ns square wave laser pulse.First electrooptical switching, 14 rising edges are 9ns, and suffix pulse 5 is a 3ns square wave laser pulse, and the time interval between suffix pulse 5 and the seed laser pulse 4 is 11ns.After adopting this invention, under nearly gain saturation state, the square wave distortion of regenerative amplifier reduces to 1.17 by 1.33.
Claims (5)
1, a kind of nano second laser pulse regeneration amplifier, it is characterized in that constituting by suffix pulse generation unit (24), regenerative amplifier unit (1) and electric light isolator (2), the laser pulse of the band suffix of described suffix pulse generation unit (24) output is by optical fiber (3) input described regenerative amplifier unit (1), and the laser pulse of described regenerative amplifier unit (1) output is exported through described electric light isolator (2).
2, regenerative amplifier according to claim 1, it is characterized in that described suffix pulse generation unit (24) is by a 3dB beam splitter (25), the 2nd 3dB beam splitter (26), fiber segment (28) and attenuator (27) are formed, its position relation is: seed laser pulse (4) input the one 3dB fiber optic splitter (25), an output of the one 3dB fiber optic splitter (25) and an input of described the 2nd 3dB fiber optic splitter (26) join, another output of the one 3dB fiber optic splitter (25) joins by described fiber segment (28) and attenuator (27), another input of output of this attenuator (27) and described 3dB fiber optic splitter (26) joins, and is made up of seed laser pulse (4) and the suffix laser pulse (5) that adds thereafter the laser pulse of the band suffix of described the 2nd 3dB fiber optic splitter (26) output.
3, regenerative amplifier according to claim 1, it is characterized in that described regenerative amplifier unit (1) comprises an optics cavity (7), laser signal inserts through described optical fiber (3), and successively by aspheric surface convex lens (19), / 2nd wave plates (21), first faraday isolator (22), spherical convex lens (20) and second faraday isolator (23) are imported described optics cavity (7), described optics cavity (7) is by first total reflective mirror (9), convex lens (8) and second total reflective mirror (10) constitute stable cavity, in this optics cavity, first electrooptical switching (14) and quarter-wave plate (15) are arranged between first total reflective mirror (9) and convex lens (8), between convex lens (8) and second total reflective mirror (10), described gain media (6) is set.
4, regenerative amplifier according to claim 3 is characterized in that described optics cavity (7) is folded by the 3rd total reflective mirror (11), the 4th total reflective mirror (12), the 5th total reflective mirror (13).
5, regenerative amplifier according to claim 1, it is characterized in that described electric light isolator (2) is connected in sequence by the first film polarizer (16), second electrooptical switching (18) and the second film polarizer (17), the normal of the described the first film polarizer (16) and the second film polarizer (17) becomes Brewster's angle with the light transmission direction, and the Surface Vertical of the first film polarizer (16) is in the surface of the second film polarizer (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200565878U CN201210577Y (en) | 2008-03-26 | 2008-03-26 | Nanosecond grade laser pulse regenerative amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200565878U CN201210577Y (en) | 2008-03-26 | 2008-03-26 | Nanosecond grade laser pulse regenerative amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201210577Y true CN201210577Y (en) | 2009-03-18 |
Family
ID=40481312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200565878U Expired - Lifetime CN201210577Y (en) | 2008-03-26 | 2008-03-26 | Nanosecond grade laser pulse regenerative amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201210577Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106848826A (en) * | 2017-01-12 | 2017-06-13 | 中国科学院光电研究院 | A kind of pair of electro-optical Q-switch regenerative amplification device |
-
2008
- 2008-03-26 CN CNU2008200565878U patent/CN201210577Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106848826A (en) * | 2017-01-12 | 2017-06-13 | 中国科学院光电研究院 | A kind of pair of electro-optical Q-switch regenerative amplification device |
| CN106848826B (en) * | 2017-01-12 | 2019-04-09 | 中国科学院光电研究院 | A kind of double electro-optical Q-switch regenerative amplification devices |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20160072251A1 (en) | Optical Systems | |
| EP3738180B1 (en) | Laser system and method for generating laser pulses with very high repetition rate | |
| US7903697B2 (en) | Method and system for tunable pulsed laser source | |
| JPH0685366A (en) | Harmonic mode-locked laser device | |
| EP3098912B1 (en) | Optical source with passive pulse shaping | |
| CN101262111A (en) | Nano second laser pulse regeneration amplifier | |
| CN112542761A (en) | Phase bias-based linear cavity mode-locked fiber laser and control method | |
| CN106207737A (en) | A kind of laser shaping pulse acquisition device and acquisition methods | |
| CN201210577Y (en) | Nanosecond grade laser pulse regenerative amplifier | |
| CN209516304U (en) | High efficiency optical fiber solid phase combination picosecond laser travelling-wave amplifier | |
| CN105932535B (en) | A kind of regenerative amplifier inhibiting function certainly with first pulse | |
| CN206099035U (en) | Laser shaping pulse acquisition device | |
| CN216598384U (en) | Stimulated Brillouin scattering and stimulated Raman scattering combined compressed ultrashort pulse laser | |
| CN101499609B (en) | Light path structure for cascade bi-pass laser amplifier | |
| CN106848826B (en) | A kind of double electro-optical Q-switch regenerative amplification devices | |
| CN114552344A (en) | High-energy high-beam-quality optical fiber solid-mixed picosecond laser amplifier | |
| CN101504505B (en) | Modulation-eliminating stimulated Brillouin scattering laser pulse compression apparatus | |
| CN106229802B (en) | Burst pulse optical fiber amplifying device with controllable time domain morphology | |
| Guo et al. | High-energy broadband Nd: Glass regenerative amplifier with coated birefringent filter for the high-power laser facilities | |
| CN207994331U (en) | A kind of full polarization fibre mode-locked laser of the high single pulse energy of low-repetition-frequency | |
| CN101800611B (en) | OTDM (Optical Time Division Multiplex) system for continuous tunable synchronization range based on SBS optical storage | |
| Simon et al. | All optical regeneration techniques | |
| CN101741004B (en) | SBS technology-based long-service-life broadband optimal pulse memory | |
| CN201425689Y (en) | Cascade bi-pass laser amplifier light path structure | |
| Sumimura et al. | Yb fiber mode-locked laser with a wide tuning range for chirped pulse amplification system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090318 |