CN108414081A - The method for improving liquid lens apparatus for measuring quality of laser beam measuring speed - Google Patents
The method for improving liquid lens apparatus for measuring quality of laser beam measuring speed Download PDFInfo
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- CN108414081A CN108414081A CN201810040068.0A CN201810040068A CN108414081A CN 108414081 A CN108414081 A CN 108414081A CN 201810040068 A CN201810040068 A CN 201810040068A CN 108414081 A CN108414081 A CN 108414081A
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- 239000007788 liquid Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000009826 distribution Methods 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 6
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- 238000003384 imaging method Methods 0.000 claims description 3
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- 238000005259 measurement Methods 0.000 abstract description 10
- 238000004458 analytical method Methods 0.000 abstract description 2
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- 238000005516 engineering process Methods 0.000 description 2
- PCTMTFRHKVHKIS-BMFZQQSSSA-N (1s,3r,4e,6e,8e,10e,12e,14e,16e,18s,19r,20r,21s,25r,27r,30r,31r,33s,35r,37s,38r)-3-[(2r,3s,4s,5s,6r)-4-amino-3,5-dihydroxy-6-methyloxan-2-yl]oxy-19,25,27,30,31,33,35,37-octahydroxy-18,20,21-trimethyl-23-oxo-22,39-dioxabicyclo[33.3.1]nonatriaconta-4,6,8,10 Chemical compound C1C=C2C[C@@H](OS(O)(=O)=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2.O[C@H]1[C@@H](N)[C@H](O)[C@@H](C)O[C@H]1O[C@H]1/C=C/C=C/C=C/C=C/C=C/C=C/C=C/[C@H](C)[C@@H](O)[C@@H](C)[C@H](C)OC(=O)C[C@H](O)C[C@H](O)CC[C@@H](O)[C@H](O)C[C@H](O)C[C@](O)(C[C@H](O)[C@H]2C(O)=O)O[C@H]2C1 PCTMTFRHKVHKIS-BMFZQQSSSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
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- Optics & Photonics (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a kind of methods improving liquid lens apparatus for measuring quality of laser beam measuring speed.This method introduces the measurement that phase iterative algorithm realizes laser beam quality in the beam quality analysis instrument based on liquid lens.Common optical axis is sequentially placed liquid lens and charge coupled cell camera.Liquid lens is connected by conducting wire with liquid lens driving power, and then the variation of the focal length of lens may be implemented.Liquid lens is fixed with charge coupled cell camera distance.The light distribution for obtaining testing laser under two different focal lengths using the device, then restores the complex amplitude information of laser using phase iterative algorithm, and then calculates the beam quality factor M of laser2.The present invention only needs to measure two points when using liquid lens measuring laser beam quality, substantially increases measurement efficiency.
Description
Technical field
The present invention relates to laser measurement fields, and in particular to a kind of raising liquid lens apparatus for measuring quality of laser beam survey
The method for measuring speed.
Background technology
Laser since the advent of the world is because of its characteristic with high brightness, high directivity, high monochromaticity and high coherence, extensively
Applied to fields such as science and technology, military, medical treatment, industrial processes and communications.In process industry, it can be used as high-intensity light source,
For cutting, punching, weld.It can be used for vehicle-mounted, Shipbased Laser Weapon in military field, also can be used as the beacon of laser weapon
Light source, and be also widely used in fields such as photoelectronic warfare, laser guidance and induced with laser nuclear fusions.
Beam quality is a core parameter for weighing laser beam quality.For different laser applications, section in history
Scholar proposes various evaluation parameters, such as：Beam quality factor (M2), Si Telieer ratio, diffraction limit factor-beta
Deng.Since beam quality factor covers near field and the far-field characteristic of laser simultaneously, other definition modes are compared, quilt extensively
International light circle is recognized, and is recommended by ISO International Organization for standardization.
To Laser Beam Quality Factor M2Measurement, scientists propose various methods.A location survey in need
The CCD multiposition measurings method of time, knife-edge method, liquid lens method etc. are measured, also there are many dynamic measurement methods, such as wavefront point
Analysis method, mode decomposition, Fabry-Perot cell method etc..Wherein liquid lens method due to it is compact-sized, be not easy to be disturbed by the external world
The advantages that dynamic, be a kind of ideal laser beam quality measuring method.However traditional liquid lens method needs repeatedly change
The focal length for becoming liquid lens realizes beam quality factor M then in conjunction with ABCD communication theories2Measurement.Since it is measured every time
It is required for measuring under ten or so different focal lengths, the single measurement time, speed was slower at one minute or so, and
Through the measurement that cannot meet the unstable laser of certain patterns.And phase iterative algorithm only needs two different locations due to it
Hot spot, that is, resilient goes out the light intensity and phase information of laser, if it is combined with liquid lens, can to greatly improve liquid saturating
Mirror method measuring laser beam matter M2Efficiency.
Invention content
The purpose of the present invention is to provide a kind of sides for improving liquid lens apparatus for measuring quality of laser beam measuring speed
Method, measuring speed is fast, and is not easy by external disturbance.
Realize that the technical solution of the object of the invention is：A kind of raising liquid lens apparatus for measuring quality of laser beam survey
The method for measuring speed, method and step are as follows：
Step 1 builds liquid lens apparatus for measuring quality of laser beam：
The liquid lens apparatus for measuring quality of laser beam includes liquid lens, conducting wire, liquid lens driving power and charge
Coupling element camera；Liquid lens is arranged in common optical axis and charge coupled cell camera, liquid lens pass through conducting wire and liquid lens
Driving power connects；
Step 2, testing laser on charge coupled cell camera, record the light of laser this moment by liquid lens focal imaging
Strong distribution；
Step 3 changes the voltage on liquid lens using liquid lens driving power and then changes the focal length of liquid lens, record
Testing laser passes through the light distribution after liquid lens on charge coupled cell after changing focal length；
Step 4, after the light distribution under obtaining two different focal lengths, by geometric optics, by obtained two light intensity point
Cloth is transformed into object space, is iterated to two light intensity of object space using phase iterative algorithm, so obtain laser light intensity and
Phase information, i.e. complex amplitude, specific iterative step are as follows：
The light intensity on charge coupled cell is measured when the voltage that step 4-1, will not change on liquid lens is set as the first light intensity, it will
Change the light intensity measured on charge coupled cell after the voltage on liquid lens and is set as the second light intensity, the initial phase of the first light intensity
It is set as 0, angular spectra theory is used in combination to be propagated to the location of second light intensity, is transferred to step 4-2；
Step 4-2, retain the first light intensity and travel to the phase information of the second light intensity position, and intensity signal is replaced with the second light
Strong information is transferred to step 4-3；
Step 4-3, the information of replaced second light intensity is traveled into the first light intensity in step 4-1 using angular spectra theory again
Position, and retain the information that intensity signal is replaced with the first light intensity by phase, it is transferred to step 4-4；
Step 4-4, judge whether the light intensity after the first light intensity travels to the second light intensity position is substantially consistent with the second light intensity, if one
It causes, return to step 4-1；If consistent, that is, obtain the light intensity and phase information of laser.
Step 5, according to complex amplitude, utilize angular spectra theory to realize beam quality factor M2Calculating, and calculating process is tight
Lattice are carried out according to 11146 standards of ISO.
Compared with prior art, the present invention its remarkable advantage is：
（1）Measurement result is not easy to be influenced by external disturbance.
（2）Liquid lens only needs to convert a posterior focal distance, substantially increases measurement efficiency.
（3）Optical element only has liquid lens, effectively inhibits influence of the various aberrations of optical element to measurement result.
Description of the drawings
Fig. 1 is fluid present invention lens laser beam quality measuring device overall structure diagram.
Fig. 2 is that the phase iteration for the method that the present invention improves liquid lens apparatus for measuring quality of laser beam measuring speed is calculated
Method flow chart.
Specific implementation mode
Present invention is further described in detail below in conjunction with the accompanying drawings.
A kind of method improving liquid lens apparatus for measuring quality of laser beam measuring speed combined with Figure 1 and Figure 2, it is to be measured
Laser first passes around 1 focal imaging of liquid lens on charge coupled cell camera 4, records the light distribution of laser this moment；
Change the focal length of liquid lens by conducting wire changes the voltage on liquid lens using liquid lens driving power, record changes
Testing laser passes through the light distribution after liquid lens 1 on charge coupled cell 4 after varifocal.
Above-mentioned apparatus is after the hot spot under obtaining two different focal lengths, by geometric optics, by obtained two hot spots
It is transformed into object space, then two light intensity of object space are iterated using phase iterative algorithm, and then obtains the light intensity of laser
And phase information.Specific iterative step is as follows：1. by being measured on charge coupled cell 4 when not changing the voltage on liquid lens 1
Light intensity be set as the first light intensity, will measure the light intensity on charge coupled cell 4 after the voltage changed on liquid lens 1 and be set as second
The initial phase of light intensity, the first light intensity is set as 0, and angular spectra theory is used in combination to be propagated to the location of second light intensity, is transferred to step
Suddenly 2.；2., retain the first light intensity and travel to the phase information of the second light intensity position, and intensity signal is replaced with the second light intensity
3. information is transferred to step；3., 1. the information of replaced second light intensity is traveled into step using angular spectra theory again in first
The position of light intensity, and retain the information that intensity signal is replaced with the first light intensity by phase, it is transferred to step 4.；4., judge the first light
Whether the light intensity traveled to by force behind the second light intensity position is substantially consistent with the second light intensity, if unanimously, return to step is 1.；If consistent,
Obtain the light intensity and phase information of laser.
After the light intensity and phase information for restoring laser by phase iterative algorithm, light beam matter is realized using angular spectra theory
Measure factor M2Calculating, and calculating process in strict accordance with 11146 standards of ISO carry out.
Claims (4)
1. a kind of method improving liquid lens apparatus for measuring quality of laser beam measuring speed, which is characterized in that method and step
It is as follows：
Step 1 builds liquid lens apparatus for measuring quality of laser beam：
The liquid lens apparatus for measuring quality of laser beam includes liquid lens（1）, conducting wire（2）, liquid lens driving power
（3）With charge coupled cell camera（4）；Liquid lens is arranged in common optical axis（1）With charge coupled cell camera（4）, liquid lens
（1）Pass through conducting wire（2）With liquid lens driving power（3）Connection；
Step 2, testing laser pass through liquid lens（1）Focal imaging is in charge coupled cell camera（4）On, it records and swashs this moment
The light distribution of light；
Step 3 utilizes liquid lens driving power（3）Change liquid lens（1）On voltage so that change liquid lens（1）'s
Focal length, testing laser passes through liquid lens after record changes focal length（1）Afterwards in charge coupled cell（4）On light distribution；
Step 4, after the light distribution under obtaining two different focal lengths, by geometric optics, by obtained two light intensity point
Cloth is transformed into object space, is iterated to two light intensity of object space using phase iterative algorithm, so obtain laser light intensity and
Phase information, i.e. complex amplitude；
Step 5, according to complex amplitude, utilize angular spectra theory to realize beam quality factor M2Calculating, and calculating process in strict accordance with
11146 standards of ISO carry out.
2. the method according to claim 1 for improving liquid lens apparatus for measuring quality of laser beam measuring speed, special
Sign is：The liquid lens（1）With charge coupled cell camera（4）Distance be steady state value.
3. the method according to claim 1 for improving liquid lens apparatus for measuring quality of laser beam measuring speed, special
Sign is：Liquid lens（1）There is different focal lengths under different voltage.
4. the method according to claim 1 for improving liquid lens apparatus for measuring quality of laser beam measuring speed, special
Sign is, in step 4, is iterated to two light intensity of object space using phase iterative algorithm, specific iterative step is as follows：
Step 4-1, liquid lens will not changed（1）On voltage when measure charge coupled cell（4）On light intensity be set as first
Light intensity will change liquid lens（1）On voltage after measure charge coupled cell（4）On light intensity be set as the second light intensity, first
The initial phase of light intensity is set as 0, and angular spectra theory is used in combination to be propagated to the location of second light intensity, is transferred to step 4-2；
Step 4-2, retain the first light intensity and travel to the phase information of the second light intensity position, and intensity signal is replaced with the second light
Strong information is transferred to step 4-3；
Step 4-3, the information of replaced second light intensity is traveled into the first light intensity in step 4-1 using angular spectra theory again
Position, and retain the information that intensity signal is replaced with the first light intensity by phase, it is transferred to step 4-4；
Step 4-4, judge whether the light intensity after the first light intensity travels to the second light intensity position is substantially consistent with the second light intensity, if one
It causes, return to step 4-1；If consistent, that is, obtain the light intensity and phase information of laser.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113092070A (en) * | 2020-12-04 | 2021-07-09 | 武汉光谷航天三江激光产业技术研究院有限公司 | Light beam quality factor M2Rapid measuring device and method |
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| CN104406685A (en) * | 2014-11-18 | 2015-03-11 | 深圳大学 | Method of measuring a M 2 factor of laser beams based on transmission liquid crystal spatial light modulator |
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-
2018
- 2018-01-16 CN CN201810040068.0A patent/CN108414081A/en active Pending
Patent Citations (3)
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| CN105444878A (en) * | 2014-09-24 | 2016-03-30 | 中国科学院大连化学物理研究所 | High-precision mass measurement device and high-precision mass measurement method of chemical oxygen iodine laser far-field beam |
| CN104406685A (en) * | 2014-11-18 | 2015-03-11 | 深圳大学 | Method of measuring a M 2 factor of laser beams based on transmission liquid crystal spatial light modulator |
| CN105784334A (en) * | 2016-04-08 | 2016-07-20 | 中国人民解放军国防科学技术大学 | Fiber laser beam quality measurement method base on photoelectric detector and CCD camera |
Non-Patent Citations (3)
| Title |
|---|
| NIEDERRITER DR，ET AL: "《Measurement of the M2 beam propagation factorusing a focus-tunable liquid lens》", 《APPLIED OPTICS》 * |
| PAN SH等: "《Real-time complex amplitude reconstruction method for beam quality M2 factor measurement》", 《OPTICS EXPRESS》 * |
| SHI WB等: "《Measuring laser beam quality by use of phase retrieval and Fraunhofer diffraction》", 《PROCEEDINGS OF SPIE》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113092070A (en) * | 2020-12-04 | 2021-07-09 | 武汉光谷航天三江激光产业技术研究院有限公司 | Light beam quality factor M2Rapid measuring device and method |
| CN113092070B (en) * | 2020-12-04 | 2024-02-23 | 武汉光谷航天三江激光产业技术研究院有限公司 | Beam quality factor M 2 Quick measuring device and method |
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Application publication date: 20180817 |