CN1165291A - Large power laser polarization state measuring instrument - Google Patents
Large power laser polarization state measuring instrument Download PDFInfo
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- CN1165291A CN1165291A CN 97104164 CN97104164A CN1165291A CN 1165291 A CN1165291 A CN 1165291A CN 97104164 CN97104164 CN 97104164 CN 97104164 A CN97104164 A CN 97104164A CN 1165291 A CN1165291 A CN 1165291A
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- Prior art keywords
- polarization state
- power laser
- measuring instrument
- power
- state measuring
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Abstract
A high-power laser polarization state measurer features use of metallic reflecting plate instead of polarization detector for omnibearing polarization state measurement of linear polarizing condition.
Description
The present invention relates to the large power laser polarization state fields of measurement.
The large power laser polarization state has significant impact to the efficient and the quality of materials processing, and not only by the optical property decision of material itself, also incident angle and the polarization state with laser beam has direct relation to the absorptance of material for laser light bundle.
The polarization state characteristic of laser beam is to describe with degree of polarization, two amounts of extinction ratio, and formulate is:
ρ=(I
max-I
min)/(I
max+I
min)
ρ is a degree of polarization in the formula,
I is a radiation intensity.
This shows that degree of polarization is a relative quantity, can measure with the planar power energy meter.
Laser polarization state measuring system commonly used is carried out with the polarizer, analyzer.But when processing is measured with laser beam (high-power laser beam), because polaroid has very high energy absorption characteristics, can't stand the high power density laser bundle so hold, therefore the measurement to the high-power laser beam polarization state is the problem that the utmost point need solve.
The surveying instrument that the purpose of this invention is to provide high-power laser beam polarization state a kind of simple in structure, easy to use.
Technical scheme of the present invention is: laser beam irradiation is reflected to specific reflecting surface, and with power (or energy) meter reflected light is measured.Above-mentioned reflecting surface is to be made by metal material, and the surface is coated with the special reflecting material, and there is water cooling plant metal material inside, uses water cooling, will absorb heat energy and take away.The reflecting surface that with known reflectivity is R is done the change in location of 10 °-80 ° (with the angle of optical axis) at optical axis direction, the performance number when measuring different angles after the reflection, and the reflective power value is a constant when circular polarization or random polarization, the light beam general power is P
Always=P
Instead/ R, then reflective power P
MaxAnd P
MinCan record polarization variations qualitatively when this has just detected with axial different angle.Behind selected different angles location with optical axis, again reflecting surface is done 360 ° of rotations around optical axis, follow folded light beam with power meter or energy meter and survey its power or energy value.When reflecting surface rotates to reflective power maximum when vertical with the polarization direction, so just can obtain different azimuth polarization state qualitatively.With under the polarizer, the analyzer low power optical beam polarization sensitivity of this device being demarcated, revise the degree of polarization value of front again, the direct quantitative that high-power laser beam carries out polarization state is detected with regard to available apparatus of the present invention with it.
Accompanying drawing 1 of the present invention is the polarization state measuring instrument operation chart.
1 is reflecting surface among the figure, and 2 is laser beam axis, and 3 is power (or energy) meter, and 4 for doing the support bar of 360 ° of rotations.
Embodiments of the invention are explained as follows in conjunction with the accompanying drawings:
Reflecting surface is made by aluminium or copper material, and there is the water cooling path inside, and the surface is coated with the material of special reflecting than R, and surface smoothness is
13Make elliptical area, this reflecting surface 1 can be done 10 °-80 ° location rotation in optical axis Z plane, measure the reflective power of diverse location, reflecting surface is fixed on required locating goes up (degree of selecting location), do 360 ° rotation again around optical axis Z, qualitative under this angle, (locate) polarization state of 360 ° of different azimuth of light beam of measuring.Under the low power laser bundle, instrument of the present invention is made Polarization-Sensitive degree (extinction ratio) again and demarcates, draw correction factor with the polarizer, analyzer, revise the back with regard to available it high-power laser beam is made detection by quantitative.
The present invention has following characteristics: 1) can do to high-power laser beam the direct qualitative, quantitative test of polarization state; 2) knot Structure is simple; 3) easy to use.
Claims (3)
1, large power laser polarization state measuring instrument is characterized in that having with the reflecting surface of the fixation reflex ratio power meter as analyzer and traceable reflecting bundle power.
2, large power laser polarization state measuring instrument according to claim 1, it is characterized in that doing 10 °-80 ° at the laser beam axial plane by reflector plate, to select the position fixing, and can do 360 ° of rotations around optical axis, measures power (energy) value after the reflection.
3, large power laser polarization state measuring instrument according to claim 1 and 2 is characterized in that using the polarizer under the low power laser bundle, and analyzer carries out polarization sensitivity and demarcates.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 97104164 CN1165291A (en) | 1997-04-29 | 1997-04-29 | Large power laser polarization state measuring instrument |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 97104164 CN1165291A (en) | 1997-04-29 | 1997-04-29 | Large power laser polarization state measuring instrument |
Publications (1)
Publication Number | Publication Date |
---|---|
CN1165291A true CN1165291A (en) | 1997-11-19 |
Family
ID=5167191
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 97104164 Pending CN1165291A (en) | 1997-04-29 | 1997-04-29 | Large power laser polarization state measuring instrument |
Country Status (1)
Country | Link |
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CN (1) | CN1165291A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102667426A (en) * | 2009-10-19 | 2012-09-12 | Ipg光子公司 | Assembly for monitoring power of randomly polarized light |
CN107014493A (en) * | 2017-04-19 | 2017-08-04 | 哈尔滨工业大学 | A kind of direct measurement device and method of photon polarization state density matrix |
CN109186755A (en) * | 2018-08-20 | 2019-01-11 | 北京国科世纪激光技术有限公司 | A kind of energy of lasers monitoring device |
CN109238467A (en) * | 2018-08-29 | 2019-01-18 | 中国农业大学 | Polarization degree measuring device |
-
1997
- 1997-04-29 CN CN 97104164 patent/CN1165291A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102667426A (en) * | 2009-10-19 | 2012-09-12 | Ipg光子公司 | Assembly for monitoring power of randomly polarized light |
CN107014493A (en) * | 2017-04-19 | 2017-08-04 | 哈尔滨工业大学 | A kind of direct measurement device and method of photon polarization state density matrix |
CN107014493B (en) * | 2017-04-19 | 2018-09-07 | 哈尔滨工业大学 | A kind of direct measuring device and method of photon polarization state density matrix |
CN109186755A (en) * | 2018-08-20 | 2019-01-11 | 北京国科世纪激光技术有限公司 | A kind of energy of lasers monitoring device |
CN109186755B (en) * | 2018-08-20 | 2021-02-12 | 北京国科世纪激光技术有限公司 | Laser energy monitoring device |
CN109238467A (en) * | 2018-08-29 | 2019-01-18 | 中国农业大学 | Polarization degree measuring device |
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