CN201955580U - Polarized light depolarizer utilizing Fabry-Perot cavity - Google Patents
Polarized light depolarizer utilizing Fabry-Perot cavity Download PDFInfo
- Publication number
- CN201955580U CN201955580U CN2010206931517U CN201020693151U CN201955580U CN 201955580 U CN201955580 U CN 201955580U CN 2010206931517 U CN2010206931517 U CN 2010206931517U CN 201020693151 U CN201020693151 U CN 201020693151U CN 201955580 U CN201955580 U CN 201955580U
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- fabry
- perot
- polarized light
- perot cavity
- rotation element
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Abstract
The utility model provides a polarized light depolarizer utilizing a Fabry-Perot cavity. The technical scheme includes that the polarized light depolarizer comprises the Fabry-Perot cavity consisting of a Fabry-Perot cavity shell, a front reflector and a rear reflector, the front reflector and the rear reflector are fixed at two inner ends of the Fabry-Perot cavity shell, the internal reflectivity of the front reflector and the internal reflectivity of the rear reflector are extremely high, and a magnetic optical rotation element is arranged in the middle of the Fabry-Perot cavity and consists of a magneto-optical crystal and a coil, and the coil is arranged on the periphery of the magneto-optical crystal and is coaxial with the magneto-optical crystal. The magneto-optical crystal in the magnetic optical rotation element is arranged in the Fabry-Perot cavity shell, and the coil in the magnetic optical rotation element is disposed outside the Fabry-Perot cavity shell. A polarizer shell which can be combined with or separated from the Fabry-Perot cavity shell is disposed at a light inlet end of the Fabry-Perot cavity, and a parallel beam splitting polarizer is fixed in the polarizer shell.
Description
Technical field
The utility model relates to a kind of optical device, especially a kind of polarized light depolarizer with Fabry-Perot-type cavity with the polarized light depolarization.
Background technology
In the prior art, technique known is that the applicant applies for, No. 200920311590.4 patents by mandate of Patent Office of State Intellectual Property Office and bulletin, this patent disclosure a kind of technical scheme of the polarized light depolarizer with Fabry-Perot-type cavity, the Fabry-Perot-type cavity of this scheme utilization routine and a magnetic rotation element reach monochromatic light and wide band polychromatic light are carried out depolarization, can obtain depolarization effect preferably.But, the required magnetic field of magnetic rotation element that this scheme adopts is by providing with the coaxial field coil of magneto-optical crystal, field coil needs exciting current could produce magnetic field, therefore be an active device, the processing and manufacturing more complicated, and when work, also needing power supply, this is the existing in prior technology weak point.
Summary of the invention
The purpose of this utility model is exactly at the existing in prior technology deficiency, and a kind of technical scheme of the polarized light depolarizer with Fabry-Perot-type cavity is provided, the Fabry-Perot-type cavity that this scheme employing is conventional and a magnetic rotation element reach monochromatic light and wide band polychromatic light are carried out depolarization, and the depolarization effect is not influenced by the polarization of incident light attitude, and the required magnetic field of magnetic rotation element is to produce apart from adjustable permanent magnet magnetic ring between two, and its structure is very simple.
This programme is realized by following technical measures: comprise by the Fabry-Perot cavity shell with in the Fabry-Perot cavity shell having, the Fabry-Perot-type cavity that front mirror that the internal reflection rate is high and back mirror are formed, the characteristics of this programme are to be provided with a magnetic rotation element at the middle part of described Fabry-Perot-type cavity, described magnetic rotation element is by a magneto-optical crystal and coaxial at magneto-optical crystal periphery and magneto-optical crystal, and between before the adjustable permanent magnet of distance magnet ring and back magnet ring form.The concrete characteristics of this programme also have, and the magneto-optical crystal in the described magnetic rotation element is in the Fabry-Perot cavity shell, and preceding magnet ring in the magnetic rotation element and back magnet ring are outside the Fabry-Perot cavity shell.The light inputting end of described Fabry-Perot-type cavity have with the Fabry-Perot cavity shell can deciliter the polariscope housing, at this polariscope housing internal fixation the parallel beam splitter polariscope is arranged.Described parallel beam splitter polariscope is the birefringece crystal that adopts.
The beneficial effect of this programme can be learnt according to the narration to such scheme, because the middle part of the Fabry-Perot-type cavity in this scheme is provided with a magnetic rotation element, described magnetic rotation element is coaxial at magneto-optical crystal periphery and magneto-optical crystal, and between before the adjustable permanent magnet of distance magnet ring and back magnet ring form.The light inputting end of described Fabry-Perot-type cavity have with the Fabry-Perot cavity shell can deciliter the polariscope housing, at this polariscope housing internal fixation the parallel beam splitter polariscope is arranged.This structure, when secondary color or monochromatic linearly polarized light by the incident end of Fabry-Perot-type cavity in front mirror enters Fabry-Perot-type cavity, through the magnetic rotation element linear polarization polarization surface has been changed the angle of a ω again, polarized light through having changed plane of polarization has only seldom a part of through back mirror method of radiation Fabry-Perot-type cavity, major part is then reflected by back mirror, the polarized light that reflects is again behind the magnetic rotation element, reflect through front mirror again, and then transmit part by back mirror through the magnetic rotation element, most of polarized light reflects back through back mirror again, the current polarized light that transmits by back mirror, the angle that the just relative polarization of incident light face of its plane of polarization has rotated 3 ω, incident polarized light is through so circulation reflection, after incident light is penetrated by Fabry-Perot-type cavity fully, just comprise the polarized light of various angle plane of polarizations, reduced degree of polarization, reached the purpose of depolarization.Learn according to calculating, the depolarizer that adds the magnetic rotation element with Fabry-Perot-type cavity, best to the ovality of elliptically polarized light depolarization effect near zero time, that is to say the depolarization effect of linearly polarized light best, depolarization effect to elliptically polarized light is relatively poor, and circularly polarized light is not just had the depolarization effect, therefore, add the depolarizer of magnetic rotation element with Fabry-Perot-type cavity, only be applicable to the depolarization of secondary color or monochromatic linearly polarized light.If, the depolarizer incident light end that adds the magnetic rotation element at Fabry-Perot-type cavity installs a parallel beam splitter polariscope again additional, the ability of its depolarization just no longer is subjected to the restriction of polarization state, such depolarizer can not only also can have good depolarization effect to elliptically polarized light and circularly polarized light to the linearly polarized light depolarization.Because, the parallel beam splitter polariscope can with the elliptically polarized light of incident or circularly polarized light etc. arbitrarily the polarized light of form be divided into the orthogonal linearly polarized light of two-beam road parallel polarization direction, light wave to the Fabry-Perot-type cavity input is still linearly polarized light, therefore, to the linearly polarized light depolarization time, can adopt Fabry-Perot-type cavity to add the depolarizer of magnetic rotation element, and during to elliptically polarized light or circularly polarized light depolarization, then to adopt the depolarizer that before Fabry-Perot-type cavity adds magnetic rotation element depolarizer, adds the parallel beam splitter polariscope.This programme has can not only be to wide band monochromatic light depolarization, also can be to wide band polychromatic light depolarization; The effect of depolarization does not rely on the polarization of incident light attitude again; Do not change convenient and other device coupling simultaneously after the light path depolarization; Used in addition magnetic rotation element is a passive device, and it is simple in structure, easily processing and fabricating.This shows that the utility model compared with prior art has substantive distinguishing features and progress, the beneficial effect of its enforcement also is conspicuous.
Description of drawings:
Fig. 1 is the part sectional structure synoptic diagram of the utility model embodiment.
Among the figure, 1 is the parallel beam splitter polariscope, and 2 is the polariscope housing, and 3 is front mirror, and 4 is preceding magnet ring, and 5 is the Fabry-Perot cavity shell, and 6 is the back magnet ring, and 7 is magneto-optical crystal, and 8 is back mirror, and 9 is Fabry-Perot-type cavity.
Embodiment:
For clearly demonstrating the technical characterstic of this programme,, and, this programme is set forth in conjunction with its accompanying drawing below by an embodiment.
By accompanying drawing as can be seen, the polarized light depolarizer with Fabry-Perot-type cavity of this programme, having by Fabry-Perot cavity shell 5 with in Fabry-Perot cavity shell 5 has, the Fabry-Perot-type cavity 9 that front mirror 3 that the internal reflection rate is high and back mirror 8 are formed, this programme is to be provided with a magnetic rotation element at the middle part of described Fabry-Perot-type cavity 9, described magnetic rotation element is by a magneto-optical crystal 7 and coaxial with magneto-optical crystal 7 in magneto-optical crystal 7 peripheries, and between before the adjustable permanent magnet of distance magnet ring 4 and back magnet ring 6 form.Magnet ring 4 and back magnet ring 6 can produce the axial magnetic field coaxial with magneto-optical crystal 7 before described, and this action of a magnetic field can make the angle of rotating a ω by the linear polarization polarization surface of magneto-optical crystal 7 in magneto-optical crystal 7.Magneto-optical crystal 7 in the described magnetic rotation element is in Fabry-Perot cavity shell 5, and preceding magnet ring 4 in the magnetic rotation element and back magnet ring 6 are outside Fabry-Perot cavity shell 5.The light inputting end of described Fabry-Perot-type cavity 9 have with Fabry-Perot cavity shell 5 can deciliter polariscope housing 2, at these polariscope housing 2 internal fixation parallel beam splitter polariscope 1 is arranged, described parallel beam splitter polariscope 1 is the birefringece crystal that adopts.Installing parallel beam splitter polariscope 1 additional is for depolarization elliptically polarized light or circularly polarized light are provided with, because, the depolarizer that is added the magnetic rotation element by Fabry-Perot-type cavity 9 is best to the depolarization effect of linearly polarized light, so the depolarizer that only uses Fabry-Perot-type cavity 9 to add the magnetic rotation element when simple depolarization linearly polarized light gets final product, and when depolarization elliptically polarized light or circularly polarized light, just need before adding the depolarizer of magnetic rotation element, Fabry-Perot-type cavity 9 install parallel beam splitter polariscope 1 additional, this moment not only can be to the linearly polarized light depolarization, simultaneously also can be to elliptically polarized light or circularly polarized light depolarization, and can reach identical effect.
Claims (4)
1. polarized light depolarizer with Fabry-Perot-type cavity, comprise by the Fabry-Perot cavity shell with in the Fabry-Perot cavity shell and having, the Fabry-Perot-type cavity that front mirror that the internal reflection rate is high and back mirror are formed, it is characterized in that: be provided with a magnetic rotation element at the middle part of described Fabry-Perot-type cavity, described magnetic rotation element is by a magneto-optical crystal and coaxial at magneto-optical crystal periphery and magneto-optical crystal, and between before the adjustable permanent magnet of distance magnet ring and back magnet ring form.
2. depolarizer according to claim 1 is characterized in that: the magneto-optical crystal in the described magnetic rotation element is in the Fabry-Perot cavity shell, and preceding magnet ring in the magnetic rotation element and back magnet ring are outside the Fabry-Perot cavity shell.
3. depolarizer according to claim 1 and 2 is characterized in that: the light inputting end of described Fabry-Perot-type cavity have with the Fabry-Perot cavity shell can deciliter the polariscope housing, at this polariscope housing internal fixation the parallel beam splitter polariscope is arranged.
4. depolarizer according to claim 3 is characterized in that: described parallel beam splitter polariscope is the birefringece crystal that adopts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206931517U CN201955580U (en) | 2010-12-31 | 2010-12-31 | Polarized light depolarizer utilizing Fabry-Perot cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206931517U CN201955580U (en) | 2010-12-31 | 2010-12-31 | Polarized light depolarizer utilizing Fabry-Perot cavity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201955580U true CN201955580U (en) | 2011-08-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206931517U Expired - Fee Related CN201955580U (en) | 2010-12-31 | 2010-12-31 | Polarized light depolarizer utilizing Fabry-Perot cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201955580U (en) |
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2010
- 2010-12-31 CN CN2010206931517U patent/CN201955580U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110831 Termination date: 20131231 |