CN108801465A - A kind of laser polarization state measuring device and its measurement method - Google Patents
A kind of laser polarization state measuring device and its measurement method Download PDFInfo
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- CN108801465A CN108801465A CN201810703684.XA CN201810703684A CN108801465A CN 108801465 A CN108801465 A CN 108801465A CN 201810703684 A CN201810703684 A CN 201810703684A CN 108801465 A CN108801465 A CN 108801465A
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- 230000010287 polarization Effects 0.000 title claims abstract description 82
- 238000000691 measurement method Methods 0.000 title claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 60
- 238000003384 imaging method Methods 0.000 claims abstract description 4
- VVOIQBFMTVCINR-WWMZEODYSA-N 11-deoxycorticosterone pivalate Chemical compound C1CC2=CC(=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H](C(=O)COC(=O)C(C)(C)C)[C@@]1(C)CC2 VVOIQBFMTVCINR-WWMZEODYSA-N 0.000 claims description 6
- 238000009738 saturating Methods 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 claims description 2
- 239000011022 opal Substances 0.000 claims description 2
- 238000001579 optical reflectometry Methods 0.000 claims description 2
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical compound FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 claims 1
- 238000007747 plating Methods 0.000 claims 1
- 230000000306 recurrent effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000010297 mechanical methods and process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000000711 polarimetry Methods 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
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- 230000035800 maturation Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- G01J4/00—Measuring polarisation of light
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- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention provides a kind of laser polarization state measuring device and its measurement method, the program includes polarizing beam splitter mirror, polarization splitting prism I, II, 45 ° of polarization splitting prism, I, 45 ° of total reflective mirror total reflective mirror II, diffusing transmission screen I, diffusing transmission screen II, diffusing transmission screen III, diffusing transmission screen IV, CCD camera, data processor and synchronizer trigger；The program uses the beamlet relative energy measurement method of diffusing transmission screen combination CCD camera imaging, is measured for laser polarization state, and simple system integrated level is high, is particularly suitable for the larger high recurrent frequency pulse laser measuring polarization state of bore.
Description
Technical field
The present invention relates to laser technology field, especially a kind of laser polarization state measuring device and its measurement method.
Background technology
With the development of laser technology, the performance parameter of laser is of increased attention.Polarization state is as laser
A critical nature be such as cut by laser efficiency, Laser coherent combining effect, sodium beacon in many application fields of laser
The optimization of laser light echo efficiency and laser freuqency doubling/and frequency efficiency etc., be unable to do without the Polarization Control of laser, and realizes effective
The premise of control and its effect assessment is the accurate measurement of laser polarization state.The main method of polarization state parameter measurement has Mechanical Method
And divide amplitude, Mechanical Method is because its time response velocity fails is limited, and is widely used and is restricted；Divide amplitude is because can be simultaneously
Four stokes parameters of laser are measured, and detector can be matched according to test, and is used widely.2017
Year, Li Ningxin et al. is in Patent publication No：It is disclosed in CN107271041A a kind of based on divide amplitude measurement laser polarization state
Laser polarization state measuring instrument.2008, Wang Xiaoman et al. was in Patent publication No：One kind is disclosed in CN101303256 to be based on
The embedded type polarization state measuring instrument of liquid crystal.Laser polarization state measuring device disclosed above, mostly uses greatly multigroup photodetector
It is detected, has both been unfavorable for the system integration and optical path adjusting is more complicated, entire measuring system volume cannot do small thus use
It is inconvenient.It is commonplace for the fall-off meter of small-bore, common continuous laser polarization state test on Vehicles Collected from Market；But
For Centimeter Level bore, Gao Zhongying, short-pulse laser measuring polarization state, the maturation for meeting its polarimetry requirement very well yet there are no
Instrument is urgently researched and developed for the polarimetry technology and measuring device of the type laser.
Invention content
The purpose of the present invention aiming at deficiency of the prior art, and provides a kind of laser polarization state measurement dress
It sets and its measurement method, the beamlet relative energy measurement method that the program is imaged using diffusing transmission screen combination CCD camera, for swashing
Polarization state measures, and simple system integrated level is high, is particularly suitable for the larger high recurrent frequency pulse laser measuring polarization state of bore.
This programme is achieved by the following technical measures：
A kind of laser polarization state measuring device includes polarizing beam splitter mirror (2), polarization splitting prism I (3), polarization spectro
Prism II (4), 45 ° of total reflective mirrors I (5), 45 ° of total reflective mirrors II (6), diffusing transmission screen I (7), diffusing transmission screen II (8), diffusing transmission screen III
(9), diffusing transmission screen IV (10), CCD camera (11), data processor (12) and synchronizer trigger (13)；Measured laser device (1) is sent out
It penetrates laser beam and is divided into transmission with certain amplitude ratio and phase-delay difference, reflection two-beam road through polarizing beam splitter mirror (2), separate
Saturating, anti-two light beams respectively through polarization splitting prism I (3) and polarization splitting prism II (4), and respectively separate two light of P light and S light
Beam, 4 beam light are incident to diffusing transmission screen I (7), diffusing transmission screen II (8), diffusing transmission screen III (9) and diffusing transmission screen IV (10) respectively, into
Row volume scattering generates diffuse transmission light, and CCD camera (11) acquires hot spot, and data processor (12) is obtained according to the hot spot figure of acquisition
Four corresponding relative energies of hot spot, combination algorithm can calculate the polarization state of measured laser device (1) transmitting laser.
As the preferred of this programme：Polarizing beam splitter mirror (2) is coated with film layer, and the film layer is to surveyed laser P light transmission rates Tp=
79%, S light transmission rate Ts=21%, the P light and S light phase difference Δ t of transmitted light, the P light and S light phase difference Δ r of reflected light, Δ
R=90 ° or -90 ° of t- Δs.
As the preferred of this programme：Polarization splitting prism I (3) and polarization splitting prism II (4), it is saturating to surveyed laser P light
Cross rate Tp>96%, S light reflectivity Rs>99%, 0 °~2 ° of incident light beam strikes angular region.
As the preferred of this programme：With respect to polarizing beam splitter mirror (2), the two S light light transmissions when polarization splitting prism I (3) is put
Axis differs 45 °.
As the preferred of this programme：With respect to polarizing beam splitter mirror (2), the two S light light transmissions when polarization splitting prism II (4) is put
Axis differs 45 °.
As the preferred of this programme：Diffusing transmission screen I (7), diffusing transmission screen II (8), diffusing transmission screen III (9) and diffusing transmission screen IV
(10) it is the opal glass or polyfluortetraethylene plate with lambert's diffusing transmission performance.
As the preferred of this programme：45 ° of total reflective mirrors I (5) and 45 ° of total reflective mirrors II (6) are coated with film layer, which swashs to surveying
Light has high reflectance.
As the preferred of this programme：CCD camera (11) is area array CCD digital camera, is furnished with imaging lens, and with triggering
Function, response wave band match with incident laser.
A kind of measurement method that laser polarization state is surveyed, it is characterized in that：
Laser polarization state and polarization parameter are indicated using Stokes vector, if Stokes vector is S=(S0,S1,S2,
S3)T, it is I=(I that CCD camera (11), which acquires the corresponding electric signal column vector of hot spot,0,I1,I2,I3)T, then
I=AS (1)
In formula, A is instrument matrix, and the laser that standard polarization state can be used is obtained by calibration experiment.Measure laser polarization
When state, the electric signal column vector I obtained by CCD camera (11) acquisition by formula (2) can calculate the Stokes of incident laser
Vector.
S=A-1I (2)
According to Stokes vector, the polarization state parameter of measured laser device (1) can be calculated by formula (3)~formula (8)：Partially
Degree of shaking P, linear polarization degree DOLP, circular polarization DOCP, angle of polarization θ, ellipticity e and ellipticity angle χ
DOCP=S3/S0 (5)
The advantageous effect of this programme can according to the description of the above program, due in this scenario by using unrestrained saturating
The beamlet relative energy measurement method that screen combines CCD camera imaging is penetrated, replaces using in previous test method with a CCD camera
Multigroup photodetector carries out each beamlet laser spot detection, keeps test system more compact, integrated level higher.Using CCD camera into
Row laser spot detection, since measured laser beamlet hot spot can in real time be reflected by CCD camera image, thus optical path adjusting phase
To simple, while testing laser bore also can be relatively large.The synchronizer trigger of configuration, thus cannot be only used for common continuous sharp
Polarization state is tested, it may also be used for Gao Zhongying, short-pulse laser measuring polarization state.
It can be seen that compared with prior art, the present invention having substantive features and progress, the advantageous effect implemented
It is obvious.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is P light and S light spatial relation graphs.
In figure, 1 is measured laser device, and 2 be polarizing beam splitter mirror, and 3 be polarization splitting prism I, and 4 be polarization splitting prism II, 5
For 45 ° of total reflective mirrors I, 6 be 45 ° of total reflective mirrors II 6,7 be diffusing transmission screen I, and 8 be diffusing transmission screen II, and 9 be diffusing transmission screen III, and 10 be unrestrained
Transmission screen IV, 11 be CCD camera, and 12 be data processor, and 13 be synchronizer trigger.
Specific implementation mode
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification (including any accessory claim, abstract and attached drawing), except non-specifically chatting
It states, can be replaced by other alternative features that are equivalent or have similar purpose.That is, unless specifically stated, each feature is only
It is an example in a series of equivalent or similar characteristics.
As shown in Figure 1, a kind of laser polarization state measuring device and its measurement method, including polarizing beam splitter mirror 2, polarization spectro
Prism I 3, II 4,45 ° of polarization splitting prism I 5,45 ° of total reflective mirror total reflective mirror II 6, diffusing transmission screen I 7, diffusing transmission screen II 8, diffusing transmission
Shield III 9, diffusing transmission screen IV 10, CCD camera 11, data processor 12 and synchronizer trigger 13 etc..Synchronizer trigger 13 synchronizes tactile
Measured laser device 1 and CCD camera 11 are sent out, measured laser device 1 emits laser beam and divides for certain amplitude ratio through polarizing beam splitter mirror 2
With the transflection two-beam of phase-delay difference, two light beam of transflection separated is respectively through polarization splitting prism I 3 and polarization splitting prism II
4, and two light beam of P light and S light is respectively separated, 4 beam light are incident to diffusing transmission screen I, diffusing transmission screen II, diffusing transmission screen III and overflow respectively
Transmission screen IV carries out volume scattering, generates diffuse transmission light, and CCD camera 11 acquires hot spot, and data processor 12 is according to the hot spot of acquisition
Figure, obtains four corresponding relative energies of hot spot, and combination algorithm can calculate the polarization that measured laser device 1 emits laser
State.The figure illustrates that pulse laser measuring polarization state, when the present invention is for the test of common continuous laser polarization state, synchronizes tactile
Hair device 13 is then not involved in work.
As shown in Fig. 2, P light and S light spatial relation graphs, ∑1For section, P where P light on polarizing beam splitter mirror 2 and S light1With S1
The light transmission shaft of P light and S light, ∑ respectively on polarizing beam splitter mirror 22For section, P where P light on polarization splitting prism I 3 and S light2With
S2The light transmission shaft of P light and S light, ∑ respectively on polarization splitting prism I 33To be cut where P light on polarization splitting prism II 4 and S light
Face, P3With S3The light transmission shaft of P light and S light, wherein S respectively on polarization splitting prism II 41With S2Angle is 45 °, S1With S3Angle
It is 45 °.
The present invention is not limited to above-mentioned specific implementation mode, person of ordinary skill in the field from above-mentioned conception,
Without creative work, the various transformation made are within the scope of the present invention.
The invention is not limited in specific implementation modes above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (9)
1. a kind of laser polarization state measuring device, it is characterized in that：Include polarizing beam splitter mirror (2), polarization splitting prism I (3), partially
Shake Amici prism II (4), 45 ° of total reflective mirrors I (5), 45 ° of total reflective mirrors II (6), diffusing transmission screen I (7), diffusing transmission screen II (8), unrestrained saturating
Penetrate screen III (9), diffusing transmission screen IV (10), CCD camera (11), data processor (12) and synchronizer trigger (13)；Measured laser
Device (1) emits laser beam and is divided into transmission with certain amplitude ratio and phase-delay difference, reflection two-beam through polarizing beam splitter mirror (2)
Road, saturating, anti-two light beams separated respectively through polarization splitting prism I (3) and polarization splitting prism II (4), and respectively separate P light and
Two light beam of S light, 4 beam light are incident to diffusing transmission screen I (7), diffusing transmission screen II (8), diffusing transmission screen III (9) and diffusing transmission screen IV respectively
(10), volume scattering is carried out, diffuse transmission light is generated, CCD camera (11) acquires hot spot, and data processor (12) is according to the hot spot of acquisition
Figure, obtains four corresponding relative energies of hot spot, and combination algorithm can calculate the inclined of measured laser device (1) transmitting laser
Polarization state.
2. a kind of laser polarization state measuring device according to claim 1, it is characterized in that：Polarizing beam splitter mirror (2) plating
There is film layer, the film layer is to surveyed laser P light transmission rates Tp=79%, S light transmission rate Ts=21%, the P light and S light phases of transmitted light
Potential difference Δ t, the P light and r=90 ° or -90 ° of S light phase difference Δ r, Δ t- Δ of reflected light.
3. a kind of laser polarization state measuring device according to claim 1, it is characterized in that：The polarization splitting prism I (3)
With polarization splitting prism II (4), to surveyed laser P light transmission rates Tp>96%, S light reflectivity Rs>99%, incident light beam strikes angle
0 °~2 ° of range.
4. a kind of laser polarization state measuring device according to claim 1, it is characterized in that：The polarization splitting prism I (3)
When putting 45 ° are differed with respect to polarizing beam splitter mirror (2), the two S light light transmission shafts.
5. a kind of laser polarization state measuring device according to claim 1, it is characterized in that：The polarization splitting prism II
(4) 45 ° are differed with respect to polarizing beam splitter mirror (2), the two S light light transmission shafts when putting.
6. a kind of laser polarization state measuring device according to claim 1, it is characterized in that：The diffusing transmission screen I (7) is overflow
Transmission screen II (8), diffusing transmission screen III (9) and diffusing transmission screen IV (10) are the opal glasses or poly- four for having lambert's diffusing transmission performance
Vinyl fluoride plate.
7. a kind of laser polarization state measuring device according to claim 1, it is characterized in that：45 ° of total reflective mirrors I (5) and
45 ° of total reflective mirrors II (6) are coated with film layer, which has high reflectance to surveyed laser.
8. a kind of laser polarization state measuring device according to claim 1, it is characterized in that：The CCD camera (11) is face
Battle array CCD digital cameras are furnished with imaging lens, and have Trigger Function, and response wave band matches with incident laser.
9. the measurement method that a kind of laser polarization state is surveyed, it is characterized in that：
Laser polarization state and polarization parameter are indicated using Stokes vector, if Stokes vector is S=(S0,S1,S2,S3)T,
It is I=(I that CCD camera (11), which acquires the corresponding electric signal column vector of hot spot,0,I1,I2,I3)T, then
I=AS (1)
In formula, A is instrument matrix, and the laser that standard polarization state can be used is obtained by calibration experiment.When measuring laser polarization state,
The electric signal column vector I obtained by CCD camera (11) acquisition by formula (2) can calculate the Stokes vector of incident laser.
S=A-1I (2)
According to Stokes vector, the polarization state parameter of measured laser device (1) can be calculated by formula (3)~formula (8)：Degree of polarization
P, linear polarization degree DOLP, circular polarization DOCP, angle of polarization θ, ellipticity e and ellipticity angle χ
DOCP=S3/S0 (5)
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| CN201810703684.XA CN108801465B (en) | 2018-06-29 | 2018-06-29 | Laser polarization state measuring device and measuring method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112345078A (en) * | 2020-10-27 | 2021-02-09 | 衡阳市智谷科技发展有限公司 | Polarization measurement system based on light wave polarization state |
| CN113008529A (en) * | 2021-05-12 | 2021-06-22 | 中国工程物理研究院应用电子学研究所 | Large-caliber optical element measuring system based on ultrafast laser imaging |
| CN116773151A (en) * | 2023-08-23 | 2023-09-19 | 四川中久大光科技有限公司 | High-power laser polarization degree testing method and device |
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| CN112345078A (en) * | 2020-10-27 | 2021-02-09 | 衡阳市智谷科技发展有限公司 | Polarization measurement system based on light wave polarization state |
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| CN116773151A (en) * | 2023-08-23 | 2023-09-19 | 四川中久大光科技有限公司 | High-power laser polarization degree testing method and device |
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