CN204514579U - Polarization laser autocollimating measurement instrument - Google Patents
Polarization laser autocollimating measurement instrument Download PDFInfo
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- CN204514579U CN204514579U CN201520223633.9U CN201520223633U CN204514579U CN 204514579 U CN204514579 U CN 204514579U CN 201520223633 U CN201520223633 U CN 201520223633U CN 204514579 U CN204514579 U CN 204514579U
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Abstract
A kind of for polarization laser autocollimating measurement instrument in the systems such as detection, measurement and imaging.Select output partially, polarization spectro, collimator and extender and autocollimation to be back into by laser to form as four parts.This polarization laser autocollimating measurement instrument of the utility model, selects output partially, polarization spectro, collimator and extender and autocollimation to be back into by laser and forms as four parts.There is provided the circular polarization source of parallel light of standard by the inclined output of laser choosing, polarization spectro and collimator and extender to systems such as detection, measurement and imagings, exporting the directional light angle of divergence is less than 0.1mrad, and circularly polarized round asymmetry is less than 0.01%.Partially exported by polarization spectro, laser choosing and autocollimation be back into realization that picture can return altogether light path measure and imaging display, effective isolation back light makes to return the energy entering LASER Light Source light path and is less than 0.01%, realize LASER Light Source not disturb by back light, improve the utilization factor of imaging to energy of light source simultaneously and reach more than 99%.
Description
Technical field
The utility model relates to polarization laser autocollimating measurement instrument, specifically relates to a kind of for detecting, measuring and the polarization laser autocollimating measurement instrument of imaging etc.
Background technology
The circularly polarized parallel light source of standard is all widely used in fields such as optical detection, optical measurement, bio-medical analysis and optical imageries.Along with developing rapidly of laser technology, LASER Light Source is adopted more and more to get more and more people's extensive concerning as the testing light source of optical detection, optical measurement, bio-medical analysis and optical imaging system.In recent years, both at home and abroad for how effectively to utilize polarization characteristics of lasers, reasonably solve the research hot research problem that becoming optical field one of of the polarization characteristic of LASER Light Source for systematic influences such as optical detection, optical measurement, bio-medical analysis and optical imageries own.
Laser is adopted to have the features such as monochromaticity, one-way and high-energy as light source, but the LASER Light Source inherently characteristic formed in producing due to laser instrument and manufacturing, make laser also there is its intrinsic shortcoming as testing light source, in polarization application, main manifestations is that polarization of laser output amount is impure or circular polarization state circle is asymmetric and the output beam depth of parallelism is relatively low.Polarization of laser output amount is impure or circular polarization state circle is asymmetric makes it be difficult to determine or be difficult to choose as polarization state during testing light source, and causes polarized component to interfere with each other.In high accuracy analysis, detection and measurement, need desirable parallel beam in addition more, thus can by analyzing the test result that the impact of measured object on light beam obtain needing, therefore the quality of light beam parallelism is also another key factor affecting test result.Therefore, when adopting laser as light source, how improving light beam parallelism and making to export amount of polarization single or polarization circle symmetry becomes one of Major Difficulties of Study of Laser testing light source.In addition in employing altogether light path autocollimation imaging test, how effectively to isolate light source and imaging, make not jamming light source stability, improve imaging capacity usage ratio is one of Major Difficulties of laser auto-collimation optic test simultaneously.Mostly domestic and international research is to use respectively parallel laser light source, polarization laser light source, laser auto-collimation imaging, obtains polarization laser autocollimating measurement instrument for triplicity, and for the rare relevant report of optic test, optical analysis and optical imagery.
Utility model content
The purpose of this utility model is to provide a kind of for polarization laser autocollimating measurement instrument in the systems such as detection, measurement and imaging.This polarization laser autocollimating measurement instrument can make the systems such as detection, measurement and imaging realize autocollimation and be back into picture, and provides light beam parallelism good for it, the parallel light source that outputting standard circular polarization line of return polarization and imaging and light source are isolated.
For achieving the above object, the utility model adopts following technical scheme:
A kind of polarization laser autocollimating measurement instrument, be characterised in that its formation comprises light source laser, P polaroid successively along this light source laser output beam direction, Brewster prism wedge, 1/2 wave plate, convex lens expands focusing objective len group and polarization splitting prism, quarter wave plate and convex lens collimator objective group successively in the reflected light direction of described polarization splitting prism, at the offside in the reflected light direction of described polarization splitting prism, namely object under test reflected light is convex lens through the transmitted light direction of described polarization splitting prism successively, concavees lens and CCD, described convex lens and concavees lens form autocollimation imaging CCD camera lens, be imaged on the target surface of described CCD.
1/2 described wave plate adopts 0 grade of 1/2 wave plate, and described quarter wave plate adopts 0 grade of quarter wave plate.
Described polarization splitting prism light splitting surface is coated with the reflection of S light, and reflectivity is greater than 99%, to P polarized light transmission, and the polarization beam splitter that transmissivity is greater than 99%.
The bore of described convex lens collimator objective group is set to more than 15 times that convex lens expands focusing objective len group bore.
The P polarized component of light source laser output beam first in P polaroid selects LASER Light Source to export exports, arrive prism wedge forward, and with brewster angle incidence prism wedge, the characteristic of Brewster incidence purifies again to P polarization Output of laser, and the S polarized component that the choosing of P polaroid is not fallen partially is reflected away by the plane of incidence.P polarized component after light therethrough Brewster angle prism wedge reaches 10000:1 with residue S polarized component.Then light continues to arrive a slice 1/2 wave plate forward, and the reference wavelength of wave plate is light source laser output wavelength.The rear P polarized component of light conversion is exported with S polarized component than the high-purity S polarized light changing 1:10000 into through 1/2 wave plate.Export from light source laser and remain unchanged through the angle of divergence of Laser output after P polaroid, Brewster angle prism wedge and 1/2 wave plate successively, for the original defeated light radiation angle of laser instrument is about 1 ~ 1.5rmad.Reach convex lens after light therethrough 1/2 wave plate and expand focusing objective len group.Expand outputting standard sphere light after the focusing of focusing objective len group through convex lens, after moving forward into polarization splitting prism, reflect rear steering 90 ° through polarization splitting prism light splitting surface.Polarization splitting prism light splitting surface is coated with the reflection of S polarized light, to the polarization beam splitter of P polarized light transmission.Light, by advancing with S polarization state after 1/2 wave plate, arrives a slice quarter wave plate to after polarization splitting prism reflection, forward through after quarter wave plate under the effect of quarter wave plate rotation π/4, the polarization direction angle of S polarized light, become standard round polarized light.Here, because the S polarized light purity of incidence reaches 1:10000, after rotating π/4 angle through quarter wave plate, the round asymmetry exporting circularly polarized light is less than 0.01%.Arrive forward through the standard round polarization sphere light after quarter wave plate and export convex lens collimator objective group, the bore of output convex lens collimator objective group is set to more than 15 times that convex lens expands focusing objective len group bore, the multiple that expands realizing beam-expanding collimation output is greater than 15, makes the standard parallel light angle of divergence exported be less than 0.1mrad.
When the standard parallel light that the angle of divergence that convex lens collimator objective group exports is less than 0.1mrad is radiated on tested object, bring the back light of detecting information can back through convex lens collimator objective group, oppositely advanced by the standard round polarization return message light obtained of S polarized light rotation standard π/4 angle and arrive quarter wave plate again, after under effect at quarter wave plate after through quarter wave plate, polarization state rotates standard π/4 angle again, the polarization state returning test light is converted to again the high-purity P polarized light of 10000:1, P polarization returns test light and oppositely advances and again enter polarization splitting prism, due to the spectro-film characteristic of polarization splitting prism light splitting surface, make 99% of back light through light splitting surface forward through Amici prism, only has the residue S component reflected light source light path of 1/10000, impact for light source almost can be ignored.The P polarization return message light transmission polarization splitting prism of 99% arrives forward autocollimation imaging CCD camera lens, is imaged on CCD target surface, is outputed test result by CCD.Here autocollimation imaging CCD camera lens is made up of a slice convex lens and a slice concavees lens successively in light working direction.
Technique effect of the present utility model:
The utility model polarization laser autocollimating measurement instrument, the circular polarization source of parallel light of standard is provided to systems such as detection, measurement and imagings by the inclined output of laser choosing, polarization spectro and collimator and extender, the angle of divergence exporting directional light is less than 0.1mrad, and circularly polarized round asymmetry is less than 0.01%.Partially exported by polarization spectro, laser choosing and autocollimation be back into realization that picture can return altogether light path measure and imaging display, effective isolation back light, make to return the energy entering LASER Light Source light path and be less than 0.01%, LASER Light Source is not disturbed by back light, improves the utilization factor of imaging to energy of light source simultaneously and reaches more than 99%.
Accompanying drawing explanation
Fig. 1: be the utility model polarization laser autocollimating measurement instrument index path
Embodiment
Below in conjunction with accompanying drawing, the utility model is elaborated, but protection domain of the present utility model should do not limited with this.
First refer to Fig. 1, Fig. 1 is the utility model polarization laser autocollimating measurement instrument light path schematic diagram, and as seen from the figure, the utility model polarization laser autocollimating measurement instrument is back into by laser choosing output partially, polarization spectro, collimator and extender and autocollimation and forms as four parts.
In Fig. 1, the P polarized component of light source laser 1 output beam first in a slice P polaroid 2 selects LASER Light Source to export exports, arrive Brewster prism wedge 3 forward, and with brewster angle incidence prism wedge, the characteristic of brewster angle incidence purifies again to P polarization Output of laser, selects the S polarized component partially do not fallen to be reflected away by the plane of incidence P polaroid 3.P polarized component after light therethrough Brewster angle prism wedge 3 reaches 10000:1 with residue S polarized component.Then light continues to arrive forward the reference wavelength of a slice 1/2 wave plate 4,1/2 wave plate 4 is light source laser 1 output wavelength, and 1/2 wave plate 4 adopts 0 grade of wave plate.After exporting light conversion through 1/2 wave plate 4, P polarized component and S polarized component are than the high-purity S polarized light being converted to 1:10000.Export from light source laser 1 and remain unchanged, for the original defeated light radiation angle of light source laser 1 is about 1 ~ 1.5rmad through the angle of divergence of Laser output after P polaroid 2, Brewster angle prism wedge 3 and 1/2 wave plate 4 successively.Reach convex lens after light therethrough 1/2 wave plate 4 and expand focusing objective len group 5.Expand outputting standard sphere light after focusing objective len group 5 focusing through convex lens, after moving forward into polarization splitting prism 9, reflect rear steering 90 ° through polarization splitting prism light splitting surface.Polarization splitting prism 9 light splitting surface is coated with the reflection of S light, and reflectivity is greater than 99%, to P polarized light transmission, and the polarization beam splitter that transmissivity is greater than 99%.Light is by advancing with S polarization state light after 1/2 wave plate 4, and after polarization splitting prism 9 reflects, arrive quarter wave plate 10, quarter wave plate 10 adopts 0 grade of quarter wave plate.Light forward through after quarter wave plate 10 under the effect of quarter wave plate 10 S polarized light polarization direction rotate standard π/4 angles, become standard round polarized light.Here rotate standard π/4 angle through the quarter wave plate 10 of 0 grade again because incident S polarized light purity reaches 1:10000, the round asymmetry exporting circularly polarized light is less than 0.01%.Arrive forward through the standard round polarization sphere light after quarter wave plate 10 and export convex lens collimator objective group 11, the bore of output convex lens collimator objective group 11 is set to more than 15 times that convex lens expands focusing objective len group 5 bore, realizing beam-expanding collimation output to expand multiple and be greater than 15, making to be less than 0.1mrad through exporting the directional light angle of divergence that convex lens collimator objective group 11 exports.
When the standard parallel light that the angle of divergence that convex lens collimator objective group 11 exports is less than 0.1mrad is radiated on tested object, bring the back light of detecting information can again back through convex lens collimator objective group 11, rotate by S polarized light standard round polarization that standard π/4 angles obtains to return test light and oppositely advance and arrive quarter wave plate 10, through after quarter wave plate 10 under the effect of quarter wave plate 10 polarization state rotate standard π/4 angle again, return the P polarized light that test light polarization state changes again 10000:1 into, P polarization returns test light and oppositely advances and again enter polarization splitting prism 9, due to the spectro-film characteristic of polarization splitting prism light splitting surface, make 99% of back light through light splitting surface forward through Amici prism 9, only has the residue S component reflected light source light path of 1/10000, impact for LASER Light Source 1 almost can be ignored.The P polarization of 99% returns test light and arrives forward autocollimation imaging CCD camera lens through polarization splitting prism 9, is imaged on CCD6 target surface, is outputed test result by CCD.Autocollimation imaging CCD camera lens is made up of a slice convex lens 8 and a slice concavees lens 7 successively in light working direction.
Experiment shows, this polarization laser autocollimating measurement instrument of the utility model, by laser choosing, output, polarization spectro and collimator and extender can provide the circular polarization source of parallel light of standard to systems such as detection, measurement and imagings partially, the angle of divergence exporting directional light is less than 0.1mrad, and circularly polarized round asymmetry is less than 0.01%.By polarization spectro, laser choosing partially exports and autocollimation is back into picture, and the realization that can return altogether light path is measured and imaging display; Effective isolation back light, make to return the energy entering LASER Light Source light path and be less than 0.01%, LASER Light Source is not disturbed by back light, improves the utilization factor of imaging to energy of light source simultaneously and reaches more than 99%.
Claims (4)
1. a polarization laser autocollimating measurement instrument, be characterised in that its formation comprises light source laser (1), P polaroid (2) successively along this light source laser (1) output beam direction, Brewster prism wedge (3), 1/2 wave plate (4), convex lens expands focusing objective len group (5) and polarization splitting prism (9), quarter wave plate (10) and convex lens collimator objective group (11) successively in the reflected light direction of described polarization splitting prism (9), at the offside in the reflected light direction of described polarization splitting prism (9), namely object under test reflected light is convex lens (8) through the transmitted light direction of described polarization splitting prism (9) successively, concavees lens (7) and CCD (6), described convex lens (8) and concavees lens (7) form autocollimation imaging CCD camera lens, be imaged on the target surface of CCD (6).
2. polarization laser autocollimating measurement instrument according to claim 1, it is characterized in that described 1/2 wave plate (4) adopts 0 grade of 1/2 wave plate, described quarter wave plate (10) adopts 0 grade of quarter wave plate.
3. polarization laser autocollimating measurement instrument according to claim 1, it is characterized in that described polarization splitting prism (9) light splitting surface is coated with the reflection of S light, reflectivity is greater than 99%, to P polarized light transmission, the polarization beam splitter that transmissivity is greater than 99%.
4. the polarization laser autocollimating measurement instrument according to any one of claims 1 to 3, more than 15 times that it is characterized in that the bore of described convex lens collimator objective group (11) is set to that convex lens expands focusing objective len group (5) bore.
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| CN201520223633.9U CN204514579U (en) | 2015-04-14 | 2015-04-14 | Polarization laser autocollimating measurement instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104776983A (en) * | 2015-04-14 | 2015-07-15 | 成都太科光电技术有限责任公司 | Polarized laser auto-collimation tester |
| CN110940298A (en) * | 2019-12-17 | 2020-03-31 | 重庆理工大学 | Autocollimator |
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2015
- 2015-04-14 CN CN201520223633.9U patent/CN204514579U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104776983A (en) * | 2015-04-14 | 2015-07-15 | 成都太科光电技术有限责任公司 | Polarized laser auto-collimation tester |
| CN110940298A (en) * | 2019-12-17 | 2020-03-31 | 重庆理工大学 | Autocollimator |
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