CN205091511U - Laser beam wavefront correction system - Google Patents
Laser beam wavefront correction system Download PDFInfo
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- CN205091511U CN205091511U CN201520881565.5U CN201520881565U CN205091511U CN 205091511 U CN205091511 U CN 205091511U CN 201520881565 U CN201520881565 U CN 201520881565U CN 205091511 U CN205091511 U CN 205091511U
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- wavefront
- light path
- distorting lens
- laser
- far field
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Abstract
The utility model provides a laser beam wavefront correction system, it includes main laser beam, distorting lens and high pressure drive, far field detector, wavefront sensor, detection light path, control your computer, two kinds of sensors of far field and wavefront only utilize laser system's main laser, alright accurately realize the wavefront correction that the full gloss restrainted. The utility model provides a laser beam wavefront correction system can effectively avoid little F to count the difficult problem that the wavefront was surveyed and was demarcated in the focus system, reduces the requirement of system debug precision, need not not increase extra demarcations light source simultaneously, can all arrive the effective control of target spot wavefront distortion by accurate realization complete set.
Description
Technical field
The utility model belongs to laser system Laser beam quality control technical field, in particular to a kind of laser beam wave-front correction system.
Background technology
In Optical Maser System especially high power solid-state laser system, for pursuing higher beam quality, usually need to control wavefront distortion.Traditional wavefront correction system comprises a set of distorting lens and high-voltage drive, a set of Wavefront sensor, a set of control software design, for the aberration realizing detection light path is demarcated, generally also needs a single mode fiber laser as Calibrating source.Wavefront sensor is often positioned at Beam diagnostics bag, beam size, mating between energy with Hartmann sensor is realized by appropriate design diagnosis light path, the position of Hartmann and the position of single-mode fiber Calibrating source determine the target location that wavefront distortion corrects, under normal circumstances, a series of optical element is still there is between this position to target spot, will aberration be introduced, have influence on the form of target focal spot.
For realizing the Laser beam quality control at target spot place, contracting beam optical path can be built after target spot, carrying out Wavefront detecting and closed-loop corrected.Some problems is there is, such as limited space, debugging complexity and demarcation difficulty etc. in the application of the laser system (as ultra-short pulse laser device) that the method focuses at little F number.In addition, because target spot place beam size is less, when carrying out dynamic wave pre-test, because power density is higher, very easily there is the situation of optic element damage.
Therefore, traditional wavefront correction technology all cannot realize the control of target spot place wavefront distortion comparatively accurately, easily.
Utility model content
For solving the problem, the utility model provides a kind of laser beam wave-front correction system.
The utility model provides following technical scheme:
A kind of laser beam wave-front correction system, it comprises main laser light path, distorting lens and high drive, far field detection device, Wavefront sensor, detection light path, controls computer, wherein:
Described main laser light path comprise prime light path, transmission light path, described distorting lens be arranged at Wavefront sensor before main optical path in, with control computer is connected, as wavefront correction device correction wavefront error;
Between described prime light path and distorting lens, amplifier is set, during transmitting, dynamic wave front-distortion can be introduced;
Described far field detection device is arranged at the target position of distorting lens rear laser optical path, detects static laser far field, and is connected with control computer, forms the close loop control circuit of distorting lens, transmission light path, far field detection device, control computer;
After described Wavefront sensor is arranged at distorting lens, for realizing Wavefront detecting, and being connected with control computer, forming the close loop control circuit of distorting lens, transmission light path, detection light path, Wavefront sensor, control computer.
Further, described Wavefront sensor is Hartmann wave front sensor.
Further, the test surface of described Wavefront sensor and the reflecting surface conjugation of distorting lens.
The beneficial effects of the utility model are as follows:
First: the static state of laser system and dynamic wave front-distortion are separated by native system, sentence far field closed loop and substitute wavefront closed loop, the ingenious Wavefront detecting avoiding target position at target spot, reduce complexity and the debugging difficulty of detection light path.
The second, target position wavefront distortion correction can paid close attention to the most to Physical Experiment, the beam quality of maximum improving laser system;
Three, this technology demarcates detection light path aberration light source used without the need to increasing, and can reduce costs, avoid introducing calibrated error simultaneously, promote control accuracy.
Four, the optical system involved by this technology is comparatively simple, compared to traditional target spot wavefront closed-loop fashion, have take up space little, debugging difficulty is low, need not the advantage such as wavefront demarcation.
Accompanying drawing explanation
Fig. 1: a kind of laser beam wave-front correction overall system arrangement schematic diagram;
Fig. 2-a: the focal spot distribution before the closed loop of far field;
Fig. 2-b: the focal spot distribution after the closed loop of far field;
Fig. 3-a: distribution before uncorrected dynamic wave;
Fig. 3-b: the wavefront distribution after correction.
Embodiment
Below in conjunction with the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
With reference to Fig. 1, a kind of laser beam wave-front correction system, it comprises main laser light path, distorting lens and high drive, far field detection device (being generally CCD), Wavefront sensor, detection light path, controls computer, described main laser light path comprises prime light path, transmission light path, described distorting lens be arranged at Wavefront sensor before main laser light path in, be connected with control computer, correct wavefront error as wavefront correction device; Between described prime light path and distorting lens, amplifier is set; Described far field detection device is arranged at the target position of distorting lens rear laser optical path, detects static laser far field, and is connected with control computer, forms the close loop control circuit of distorting lens, transmission light path, far field detection device, control computer; Described Wavefront sensor is preferably Hartmann wave front sensor.After being arranged at distorting lens, and the reflecting surface conjugation of the test surface of Wavefront sensor and distorting lens.For realizing Wavefront detecting, and being connected with control computer, forming the close loop control circuit of distorting lens, transmission light path, detection light path, Wavefront sensor, control computer.
The cardinal principle of a kind of laser beam wave-front correction of the present utility model gathers main laser focal spot by far field detection device at focal position, this carry system-wide static wavefront information, adopt the closed loop algorithm of focal spot information feed back, focal spot carries out closed-loop control, before the method shifted by reference to transition afterwards obtains total system to target spot passive wave on Wavefront sensor (being generally Hartmann wave front sensor), before obtaining the dynamic wave of laser system by main transmitting again, and then controlling distortion mirror realizes the correction before to full light beam static state, dynamic wave.
Far field detection device, at target position detection main laser focal spot, this carry whole static wavefront information, is designated as W
s; Wavefront sensor gathers main laser wavefront, and the wavefront information obtained is designated as W
hs, contain the wavefront distortion of part main optical path and detection light path; When carrying out dynamic emission, amplifier can produce dynamic wave front-distortion, is designated as W
d; Concrete operation step is as follows:
S1: adopt Wavefront sensor to gather the wavefront W of main laser
hs, and be set to reference, carry out dynamic emission afterwards, utilize the single acquisition pattern of Wavefront sensor, obtain the main laser wavefront of dynamic emission, the wavefront now Wavefront sensor obtained is (W before pure dynamic wave
hs+ W
d)-W
hs=W
d, record this wavefront information;
S2: after device to be amplified cools completely, utilize far field detection device, main laser focal spot is gathered at target spot place, a kind of far-field information feedback algorithm is adopted (to be random paralleling gradient algorithm herein, stochasticparallelgradientdescentalgorithm, SPGD) focal spot carries out closed-loop control, and when obtaining optimum focal spot, the face shape that distorting lens produces is-W
s.Fig. 2-a shows the distribution of the focal spot before the closed loop of far field; Fig. 2-b shows the distribution of the focal spot after the closed loop of far field; Can find out from Fig. 2-a, 2-b: laser becomes obvious single-peak structure in the focal spot distribution of target spot, and Focal intensity is greatly improved.
During far field detection device detection target spot place main laser static state focal spot, if focal length is too little, measure again after the compound lens of short Jiao can be adopted to be amplified by focal spot.
S3: keep the face shape of distorting lens in S2 step constant, adopt Wavefront sensor to carry out wave front acquisition to main laser, the wavefront that Wavefront sensor obtains is W
hs-W
s, record the wavefront information collected;
S4: with the wavefront W gathered in S3 step
hs-W
sfor reference, the control voltage of distorting lens reset, again gather main laser wavefront, the wavefront that Wavefront sensor obtains should be W
hs-(W
hs-W
s)=W
s, namely light beam is to the Static wavefront distortion of target spot;
S5: the Static wavefront distortion and the dynamic wave front-distortion that obtain full light beam in step S1 and S4, adopt Wavefront sensor to gather main laser wavefront, and be set to reference, again gather main laser, the wavefront of acquisition is 0, controls computer according to W before passive wave
s, W before dynamic wave
dinformation, controlling distortion mirror generation-(W
s+ W
dthe face shape of)/2, to compensate total system aberration.Fig. 3-a distributes before showing uncorrected dynamic wave; Fig. 3-b show correction after wavefront distribution.As can be seen from Fig. 3-a, Fig. 3-b: the PV value before dynamic wave is corrected to 0.74 λ (λ=1053nm) by 3.75 λ.
The utility model, in a set of wavefront correction system, is equipped with far field and ripple first two sensor simultaneously, only utilizes the main laser of laser system, just accurately can realize the wavefront correction of full light beam.By adopting SPGD algorithm to carry out closed-loop control to Static wavefront distortion, by transition before passive wave to Hartmann, then carry out dynamic emission, before gathering dynamic wave, last controlling distortion mirror realizes system-wide wavefront correction.The advantage of the method is the difficult problem effectively can avoiding Wavefront detecting and demarcation in little F number focusing system, reduces the requirement of system debug precision, need not increase extra Calibrating source simultaneously, accurately can realize the effective control of total system to target spot wavefront distortion.This technology is specially adapted to the Beam Control of domestic ultra-short pulse laser device, verifies by experiment, obtains domestically leading experimental result.
In addition, be to be understood that, although this instructions is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should by instructions integrally, and the technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.
Claims (3)
1. a laser beam wave-front correction system, is characterized in that: it comprises main laser light path, distorting lens and high drive, far field detection device, Wavefront sensor, detection light path, controls computer, wherein:
Described main laser light path comprise prime light path, transmission light path, described distorting lens be arranged at Wavefront sensor before main laser light path in, with control computer is connected, as wavefront correction device correction wavefront error;
Between described prime light path and distorting lens, amplifier is set, for introducing dynamic wave front-distortion when launching;
Described far field detection device is arranged at the target position of distorting lens rear laser optical path, detects static laser far field, and is connected with control computer, forms the close loop control circuit of distorting lens, transmission light path, far field detection device, control computer;
After described Wavefront sensor is arranged at distorting lens, for realizing Wavefront detecting, and being connected with control computer, forming the close loop control circuit of distorting lens, transmission light path, detection light path, Wavefront sensor, control computer.
2. a kind of laser beam wave-front correction system according to claim 1, is characterized in that: described Wavefront sensor is Hartmann wave front sensor.
3. a kind of laser beam wave-front correction system according to claim 1, is characterized in that: the test surface of described Wavefront sensor and the reflecting surface conjugation of distorting lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520881565.5U CN205091511U (en) | 2015-11-05 | 2015-11-05 | Laser beam wavefront correction system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520881565.5U CN205091511U (en) | 2015-11-05 | 2015-11-05 | Laser beam wavefront correction system |
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| Publication Number | Publication Date |
|---|---|
| CN205091511U true CN205091511U (en) | 2016-03-16 |
Family
ID=55482181
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| CN201520881565.5U Expired - Fee Related CN205091511U (en) | 2015-11-05 | 2015-11-05 | Laser beam wavefront correction system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223688A (en) * | 2015-11-05 | 2016-01-06 | 中国工程物理研究院激光聚变研究中心 | A kind of laser beam wave-front correction system and method |
| CN109683306A (en) * | 2019-01-31 | 2019-04-26 | 中国工程物理研究院激光聚变研究中心 | It is a kind of for overcoming the wavefront control method of thermal lensing effect |
| CN112859359A (en) * | 2021-02-05 | 2021-05-28 | 中国工程物理研究院激光聚变研究中心 | Focal spot control method |
-
2015
- 2015-11-05 CN CN201520881565.5U patent/CN205091511U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223688A (en) * | 2015-11-05 | 2016-01-06 | 中国工程物理研究院激光聚变研究中心 | A kind of laser beam wave-front correction system and method |
| CN109683306A (en) * | 2019-01-31 | 2019-04-26 | 中国工程物理研究院激光聚变研究中心 | It is a kind of for overcoming the wavefront control method of thermal lensing effect |
| CN112859359A (en) * | 2021-02-05 | 2021-05-28 | 中国工程物理研究院激光聚变研究中心 | Focal spot control method |
| CN112859359B (en) * | 2021-02-05 | 2022-02-08 | 中国工程物理研究院激光聚变研究中心 | Focal spot control method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160316 Termination date: 20161105 |
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| CF01 | Termination of patent right due to non-payment of annual fee |