CN206099035U - Laser shaping pulse acquisition device - Google Patents
Laser shaping pulse acquisition device Download PDFInfo
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- CN206099035U CN206099035U CN201621108023.5U CN201621108023U CN206099035U CN 206099035 U CN206099035 U CN 206099035U CN 201621108023 U CN201621108023 U CN 201621108023U CN 206099035 U CN206099035 U CN 206099035U
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- laser
- amplifier
- optical modulator
- acquisition device
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Abstract
The utility model relates to a laser shaping pulse acquisition device belongs to laser equipment technical field, acquisition device includes the kind component that connects gradually along laser signal transmission orientation, a light modulator, one -stage size -expansion ware, at least one acoustooptic Q -switch and the 2nd light modulator at least through optical fiber jumper wire, still includes the arbitrary waveform generator who is connected through the radio frequency line respectively with a light modulator, the 2nd light modulator, the utility model discloses a lightning modulation technique cascades two -stage light modulator's mode, accurate regulation and control of electric pulse that light modulator's time window was produced by arbitrary waveform generator, simultaneously, the amplifier with acoustooptic Q -switch the cooperation use, will establish the spontaneous radiated noise that the amplifier on the population inversion basis produced and carry out preliminary filtering, adopt the multi -stage amplifiers ware rationally to control the power -flow distribution in addition, is showing and is improving plastic precision, contrast and the SNR of exporting the laser shaping pulse.
Description
Technical field
The utility model belongs to laser equipment technical field, relates in particular to a kind of laser shaping pulse acquisition device.
Background technology
In large-scale device of high power laser, precision truing is carried out to the continuous laser signal of laser generation seed source output
It is a requisite link.By the shape of accurate adjustment laser signal, it can be made to meet high-density plasma thing
The research of the different field such as reason, Strong-field physics, " fast ignition " needs, wherein, the contrast of laser shaping pulse be one very
Important parameter, especially in ultra-intense laser signal and target substance interaction, in the process, before laser shaping pulse
Edge is irradiated in target substance first, and produces Pre-plasma, and it have impact on specific experiment effect.Further, since laser is whole
Need to continue transmission, amplification in the post laser link of device of high power laser after shape pulses generation, due to casacade multi-amplifier
The nonlinear effect such as gain saturatiuon impact, the contrast of laser shaping pulse is by inevitable continuous decrease.Therefore,
Laser signal generation device is asked to possess output high-contrast, the ability of high plastic precision laser signal.
With research go deep into, researcher using high pressure bubble kerr cell slicing shaping technique can produce " 0.5ns～
The laser shaping pulse of 5ns ", the method shaping capability is limited, and needs the high drive of thousands of volts, less stable.Grind
Studying carefully personnel, can also to produce nanosecond using accumulation restructuring after the narrower picosecond chirped pulse beam splitting of pulsewidth, delays, decay whole
Shape pulse, the shaped pulse mudulation effect that the method is produced substantially, there is no at present good Compensation measures.According to Brunton G,
Erbert G,Browning D,et al.The shaping of a national ignition campaign pulsed
waveform[J].Fusion Engineering and Design,2012,87(12):1940-1944., U.S.'s NIF devices
The contrast of the laser pulse of laser pulse generation system output is 275：1, the contrast can reach most for prior art
Big value.At present, time domain shaping is carried out to laser generation source using waveguide electro-optic amplitude modulator more than laser pulse generation system,
The stronger laser shaping pulse of time domain regulating power, the laser shaping arteries and veins that the method is produced can be produced using single-stage amplitude modulator
The contrast of punching is relatively low, and its plastic precision, contrast and signal to noise ratio are not enough to support the demand of Precise physical research.
Utility model content
For a variety of deficiencies of prior art, present inventor has found using after various laser signal shaping methods：
Two-stage optical modulator, and optical modulator are cascaded respectively positioned at laser link using Electro-optical Modulation technology in laser link
First, last two ends, the electric pulse precision control that the time window of optical modulator can be produced by AWG, meanwhile, amplify
Device and acoustooptic switch are used cooperatively, and the spontaneous emission noise that the amplifier built on the basis of population inversion is produced is carried out just
Step is filtered, and rationally controls energy flow distribution using casacade multi-amplifier in addition, significantly improves the shaping essence of output laser shaping pulse
Degree, contrast and signal to noise ratio.
For achieving the above object, the utility model provides following technical scheme：
A kind of laser shaping pulse acquisition device, including the seed source of transmitting continuous laser signal, it is characterised in that：Along
Laser signal transmission direction is connected with turn by optical patchcord：
Optical modulator, including the first optical modulator and the second optical modulator, to the light intensity for modulating laser signal；
At least first stage amplifier, it is located between above-mentioned two optical modulator, to the energy of improving laser signal；
At least one acoustooptic switch, it is located at amplifier, to filter amplified device lifted the laser signal of energy from
Send out radiated noise；
Also include AWG, first send initial shaping electric pulse according to work schedule and be loaded into first
Optical modulator, then send secondary reshaping electric pulse and be loaded into the second optical modulator.
Further, the seed source, optical modulator, amplifier and acoustooptic switch are disposed as module board plug structure, are easy to
Device is safeguarded and integrated installation debugging.
Further, the passive transmission optical fiber inside the seed source, optical modulator and acoustooptic switch is the inclined passive light of guarantor
It is fine.
Further, the optical modulator is amplitude modulator, and first optical modulator and the second optical modulator lead to respectively
Cross radio frequency line to be connected with AWG.
Further, the amplifier is broadband optical fiber amplifier, and it is set gradually as three, reduces the increasing of casacade multi-amplifier
Impact of the nonlinear effects such as beneficial saturation to laser signal, the gain fibre inside broadband optical fiber amplifier mixes ytterbium light partially to protect
It is fine.
Further, an acoustooptic switch is set between adjacent amplifier, and the acoustooptic switch is set to altogether two.
Further, the input of the optical patchcord, optical modulator, amplifier and acoustooptic switch and output end and seed
The output end in source cuts 8 ° of oblique angles, to suppress end face reflection.
The beneficial effects of the utility model are：
1st, by the way of Electro-optical Modulation technology cascade two-stage optical modulator, optical modulator is in high precision electro for the utility model
Under the driving of pulse, time window Adjustment precision with front and back along the rise time can be better than hundred psecs, meanwhile, will be positioned at laser chain
The optical modulator of road end will can be built on the basis of population inversion as the secondary reshaping slicing device of laser signal
The spontaneous emission noise that amplifier is produced is filtered totally, significantly improve export the plastic precision of laser shaping pulse, contrast with
And signal to noise ratio.
2nd, seed source, optical modulator, amplifier and acoustooptic switch are disposed as module board plug structure in the utility model, have
Safeguard beneficial to device and integrated installation debugging.
3rd, the utility model adopts all-fiber light channel structure, and laser signal is along optical link flexible transfer, dependable performance
It is stable.
4th, the utility model adopts same AWG as the electric impulse signal source of two-stage optical modulator, arteries and veins
Rush time jitter little, it is easy to implement shaping operation.
Description of the drawings
Fig. 1 is overall structure diagram of the present utility model；
Fig. 2 is the stepped laser shaping pulse of multiple stage using the utility model output；
Fig. 3 is the rail shape laser shaping pulse using the utility model output；
Fig. 4 is the flat-top shape laser shaping pulse using the utility model output.
In accompanying drawing：1- seed sources, the optical modulators of 2- first, 3- amplifiers, 4- acoustooptic switch, 5- amplifiers, 6- acousto-optics are opened
Pass, 7- amplifiers, the optical modulators of 8- second, 9- AWGs, 10- optical patchcords, 11- radio frequency lines；
Wherein, arrow represents laser signal transmission direction in Fig. 1, and abscissa represents the time in Fig. 2-4, and unit is ns, indulges
Coordinate representation relative intensity.
Specific embodiment
In order that those skilled in the art more fully understand the technical solution of the utility model, with reference to of the present utility model
Accompanying drawing, to the technical solution of the utility model clear, complete description is carried out, and based on the embodiment in the application, this area is general
Other similar embodiments that logical technical staff is obtained on the premise of creative work is not made, should all belong to the application
The scope of protection.
Embodiment one：
As shown in figure 1, a kind of laser shaping pulse acquisition device, along laser signal transmission direction seed is disposed with
Source 1, at least the first optical modulator 2, first stage amplifier, at least one acoustooptic switch and the second optical modulator 8, seed source 1 is used for
Launch the continuous laser signal of certain power, the first optical modulator 2 and the second optical modulator 8 are to modulate the light of laser signal
By force, connected to form optical link by optical patchcord 10 between each photoelectric device, laser signal along optical link flexible transfer,
Dependable performance is stablized.
Also include AWG 9, it first sends initial shaping electric pulse and is loaded into according to work schedule
First optical modulator 2, initial shaping electric pulse determines the shape of laser signal, and it is whole that laser signal is modulated to into initial laser
Shape pulse, AWG 9 sends again secondary reshaping electric pulse and is loaded into the second optical modulator 8, swashs to initial
Light shaping pulse carries out slicing noise reduction, lifts signal to noise ratio and contrast, and AWG 9 is by radio frequency line 11 respectively with the
One optical modulator 2, the second optical modulator 8 connect, using same AWG 9 as two-stage amplitude modulator electricity
Pulse signal source, pulse time jitter is little, it is easy to implement shaping operation.
In the present embodiment, the amplifier is broadband optical fiber amplifier, and it includes successively amplifier 3,5 and 7, in amplifier
The gain fibre in portion is the inclined Yb dosed optical fiber of guarantor, to the energy of improving laser signal.Between amplifier 3 and 5, amplifier 5 and 7 it
Between be respectively provided with an acoustooptic switch, i.e., be set to two acoustooptic switch 4 and 6 altogether, lift energy to filter amplified device 3,5,7
Laser signal spontaneous emission noise.Inside the seed source 1, the first optical modulator 2, the second optical modulator 8, acoustooptic switch 4 and 6
Passive transmission optical fiber be the inclined passive fiber of guarantor.To reduce each photoelectric device internal optical fiber junction loss and reflex,
Consider cost performance, the inclined passive fiber of guarantor adopted in the present embodiment and the core diameter for protecting inclined Yb dosed optical fiber are 6 μm, bag
Layer diameter is 125 μm, in order to suppress end face reflection, the optical patchcord 10, the first optical modulator 2, the second optical modulator 8,
The output end of amplifier, the input of acoustooptic switch 4 and 6 and output end and seed source 1 cuts 8 ° of oblique angles, the seed source 1,
First optical modulator 2, the second optical modulator 8, amplifier, acoustooptic switch 4 and 6 are disposed as module board plug structure, are conducive to dress
Maintenance and integrated installation debugging are put, meanwhile, docked using high accuracy flange between above-mentioned each photoelectric device, reduce polarization mode color
Dissipate.
First optical modulator 2, the second optical modulator 8 are amplitude modulator, are based on Mach-Zehnder interferometer type
Light intensity modulator is realized.In amplitude modulator, there is strict corresponding relation between electric pulse injection and output intensity, when
When applying the electric pulse that changes along time domain on amplitude modulator, output intensity will also occur corresponding change in time domain
Change.By the initial shaping electric pulse of accurate control, the generation time of secondary reshaping electric pulse, amplitude size and pulse width,
The time domain precision truing output of laser signal can be realized.
Embodiment two：
Laser shaping pulse is obtained using the laser shaping pulse acquisition device described in embodiment one, including following step
Suddenly：
S1：The emission center wavelength of seed source 1 is 1053 nanometers, and power is about the continuous laser signal of 10 milliwatts, described to swash
Optical signal Jing optical patchcords 10 are injected in the first optical modulator 2, and AWG 9 produces initial shaping electric pulse and incites somebody to action
It is loaded into the first optical modulator 2, and the laser signal is modulated to initial laser shaped pulse；
S2：The initial laser shaped pulse injection amplification device 3, carries out primary energy lifting, injects acoustooptic switch 4, filter
Spontaneous emission noise after being lifted except primary energy, injection amplification device 5 carries out second energy lifting, injects acoustooptic switch 6, filters
Spontaneous emission noise after second energy lifting, injection amplification device 7 carries out three energy lifts, now, initial laser shaped pulse
Energy reach it is tens of receive joule, last initial laser shaped pulse Jing optical patchcords 10 are injected in the second optical modulator 8；
S3：AWG 9 produces secondary reshaping electric pulse according to work schedule, and is loaded into the second light tune
Device processed 8, the initial laser shaped pulse is modulated to export laser shaping pulse, now, exports the energy of laser shaping pulse
Joule is received up to ten.
By the way of Electro-optical Modulation technology cascade two-stage amplitude modulator, drive of the amplitude modulator in high precision electro pulse
Under dynamic, time window Adjustment precision along the rise time can be better than hundred psecs with front and back, meanwhile, amplifier 3,5,7 and acousto-optic are opened
Close 4,6 to use cooperatively, the spontaneous emission noise that the amplifier built on the basis of population inversion is produced tentatively filtered,
Contrast, the signal to noise ratio for preventing laser signal deteriorates in transmitting procedure, in addition, in order to reduce laser signal transmission amplify in
The non-linear phenomena such as gain saturatiuon, rationally control energy flow distribution using casacade multi-amplifier, preferably three-level, significantly improve
Export plastic precision, contrast and the signal to noise ratio of laser shaping pulse.
The initial shaping electric pulse is different from the pulse shape of secondary reshaping electric pulse, by the initial shaping of accurate control
Electric pulse, the generation time of secondary reshaping electric pulse, amplitude size and pulse width, can produce that multiple stage is stepped, rail shape
Output laser shaping pulse of different shapes with flat-top shape etc., respectively as shown in Figure 2, Figure 3 and Figure 4.
Wherein, the contrast of the output of flat-top shape shown in Fig. 4 laser shaping pulse is more than 2000：1, byDraw, the contrast is higher than the 275 of prior art：1 several times.The output laser is whole
The plastic precision of shape pulse depends on the parameter index of AWG 9 and the performance of optical modulator.In the present embodiment, appoint
The field amplitude regulating power of meaning waveform generator 9 is 2^10=1024, and Level tune resolution ratio is 0.1ns.According to signal to noise ratio
Computing formula draws,Wherein, Vs and Vn difference representation signals and noise
The virtual value of voltage amplitude, and the signal to noise ratio of NIF devices is about 50dB.
The minimum pulse width of the output laser shaping pulse sends the most short of electric pulse and holds by AWG 9
The continuous time determines that its maximum pulse is determined by the time window of acoustooptic switch 4,6, and in the present embodiment, random waveform occurs
The pulse duration time that device 9 sends continuously adjustabe from 0.1ns to 5000ns, Adjustment precision is 0.1ns, acoustooptic switch 4,6
Time window is 45ns, continuously adjustable in the range of final output 0.1ns～45ns, high-contrast, high s/n ratio and high shaping
The laser shaping pulse of precision.
Below the utility model has been described in detail, the above, only the preferred embodiment of the utility model and
, it is when the utility model practical range can not be limited, i.e., all to make impartial change and modification according to the application scope, all should still belong to this
In utility model covering scope.
Claims (7)
1. a kind of seed source of laser shaping pulse acquisition device, including transmitting continuous laser signal, it is characterised in that：Along swash
Optical signal transmission direction is connected with turn by optical patchcord：
Optical modulator, including the first optical modulator and the second optical modulator, to the light intensity for modulating laser signal；
At least first stage amplifier, it is located between above-mentioned two optical modulator, to the energy of improving laser signal；
At least one acoustooptic switch, it is located at amplifier, and the spontaneous spoke of laser signal of energy is lifted to filter amplified device
Penetrate noise；
Also include AWG, first send initial shaping electric pulse according to work schedule and be loaded into the first light tune
Device processed, then send secondary reshaping electric pulse and be loaded into the second optical modulator.
2. a kind of laser shaping pulse acquisition device according to claim 1, it is characterised in that：The seed source, light are adjusted
Device processed, amplifier and acoustooptic switch are disposed as module board plug structure.
3. a kind of laser shaping pulse acquisition device according to claim 1, it is characterised in that：The seed source, light are adjusted
Passive transmission optical fiber inside device processed and acoustooptic switch is the inclined passive fiber of guarantor.
4. a kind of laser shaping pulse acquisition device according to claim 1, it is characterised in that：The optical modulator is width
Degree modulator, first optical modulator and the second optical modulator are connected respectively by radio frequency line with AWG.
5. a kind of laser shaping pulse acquisition device according to claim 1, it is characterised in that：The amplifier is broadband
Fiber amplifier, it is set gradually as three, and its internal gain fibre is the inclined Yb dosed optical fiber of guarantor.
6. a kind of laser shaping pulse acquisition device according to claim 5, it is characterised in that：Between adjacent amplifier
One acoustooptic switch is set, and the acoustooptic switch is set to altogether two.
7. a kind of laser shaping pulse acquisition device according to claim 1, it is characterised in that：The optical patchcord, light
The output end of the input of modulator, amplifier and acoustooptic switch and output end and seed source cuts 8 ° of oblique angles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621108023.5U CN206099035U (en) | 2016-10-10 | 2016-10-10 | Laser shaping pulse acquisition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621108023.5U CN206099035U (en) | 2016-10-10 | 2016-10-10 | Laser shaping pulse acquisition device |
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| CN206099035U true CN206099035U (en) | 2017-04-12 |
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| CN201621108023.5U Expired - Fee Related CN206099035U (en) | 2016-10-10 | 2016-10-10 | Laser shaping pulse acquisition device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207737A (en) * | 2016-10-10 | 2016-12-07 | 中国工程物理研究院激光聚变研究中心 | A kind of laser shaping pulse acquisition device and acquisition methods |
| CN109616860A (en) * | 2019-02-12 | 2019-04-12 | 北京交通大学 | A kind of fiber amplifier |
| CN109802294A (en) * | 2019-03-25 | 2019-05-24 | 中国工程物理研究院上海激光等离子体研究所 | A kind of Low coherence pulse generating device of any time shaping and light spectrum reshaping |
-
2016
- 2016-10-10 CN CN201621108023.5U patent/CN206099035U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207737A (en) * | 2016-10-10 | 2016-12-07 | 中国工程物理研究院激光聚变研究中心 | A kind of laser shaping pulse acquisition device and acquisition methods |
| CN106207737B (en) * | 2016-10-10 | 2021-08-31 | 中国工程物理研究院激光聚变研究中心 | Laser shaping pulse acquisition device and acquisition method |
| CN109616860A (en) * | 2019-02-12 | 2019-04-12 | 北京交通大学 | A kind of fiber amplifier |
| CN109802294A (en) * | 2019-03-25 | 2019-05-24 | 中国工程物理研究院上海激光等离子体研究所 | A kind of Low coherence pulse generating device of any time shaping and light spectrum reshaping |
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