CN202362477U - Ultraviolet high-performance polarization beam-splitting prism - Google Patents
Ultraviolet high-performance polarization beam-splitting prism Download PDFInfo
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- CN202362477U CN202362477U CN2011205019152U CN201120501915U CN202362477U CN 202362477 U CN202362477 U CN 202362477U CN 2011205019152 U CN2011205019152 U CN 2011205019152U CN 201120501915 U CN201120501915 U CN 201120501915U CN 202362477 U CN202362477 U CN 202362477U
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- polarization beam
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- angle
- prism
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Abstract
The utility model discloses an ultraviolet high-performance polarization beam-splitting prism. The ultraviolet high-performance polarization beam splitter is characterized in that a pair of triangular prism angles are machined to be Brewster angles, a polarization beam splitting film is plated on each Brewster surface, and two Brewster surfaces are butt-jointed and are connected by an air gap so as to form a sandwich structure. According to the ultraviolet high-performance polarization beam splitter disclosed by the utility model, a damage threshold of an air cavity is high, and the application on ultraviolet and deep ultraviolet bands is not influenced; an antireflection film is plated on a light-transmitting surface so as to reduce surface loss; in addition, the ultraviolet high-performance polarization beam-splitting prism disclosed by the utility model has the advantages of simple structure, very low cost, convenience for machining and easiness for batch production.
Description
Technical field
The present invention relates to laser field, especially a kind of ultraviolet high-performance polarization splitting prism in the laser components and parts.
Background technology
Polarizing prism is a kind of device that often uses in the polarization light path; Mainly play the effect of polarization spectro; In laser system, during especially Ultra-Violet Laser is used, require height to see through; The polarization splitting prism of High Extinction Ratio, high damage threshold, at present more is glass polarization splitting prism or the plain film polarization spectro that adopts α-BBO Glan laser prism, optical cement.
Existing glass polarization splitting prism; Structure is: be made up of a pair of 45 ° of right-angle prisms; The inclined-plane of one of them right-angle prism is coated with polarization beam splitter, and the inclined-plane of a slice right-angle prism is a polished surface in addition, and the inclined-plane butt joint gummed or the optical cement of two prisms form; Four right angle faces are coated with anti-reflection film, the reflection loss when passing through prism to reduce light.Natural light incident, outgoing be two bundle degree of polarizations very high linearly polarized lights: Tp:Ts 1000:1, this two bundles polarized light is vertical each other.But in the Ultra-Violet Laser system applies, the polarization splitting prism of gummed almost can not use in ultraviolet, and glue commonly used sees through hardly; The damage threshold of optical cement polarization splitting prism is not high, and the optical cement technology of polarization beam splitter bothers very much, and bad optical cement requires flatness to reach that λ/more than 10, smooth finish requires high.
Adopt existing plain film beam split, incident light need be adjusted to the Brewster angle, bad adjusting, and extinction ratio is not high, and S reflection of light direction is fixed.
In addition, existing α-BBO Glan laser prism is although extinction ratio is greater than 10
6: 1, but the crystalline material price is very expensive, is prone to cleavage, deliquescence, bad processing.
Summary of the invention
The object of the present invention is to provide a kind of ultraviolet high-performance polarization splitting prism, make things convenient for incident light to regulate, simple in structure, be easy to processing, assembling, damage threshold is high, and extinction ratio is high.
The technical solution adopted for the present invention to solve the technical problems is: a kind of ultraviolet high-performance polarization splitting prism, comprise that an angle is processed into the triangular prism of Brewster angle, and the Brewster face of said triangular prism is coated with polarization beam splitter; Said two Brewster faces adopt air-gap to connect; The material of said triangular prism can be that ultraviolet is melted quartz, CaF2; The angle of said a pair of triangular prism all is a Brewster angle, and the another one angle can be the right angle, also can be arbitrarily angled; The structure of said ultraviolet high-performance polarization splitting prism is glass/polarization beam splitter/air/polarization beam splitter/glass.The employing air-gap connects, and the air chamber damage threshold is high, uses at ultraviolet, deep ultraviolet wave band to have no influence; The face that all the other light paths are passed through is coated with anti-reflection film, reduces the surface reflection loss.
Light path principle of the present invention is: incidence natural lights vertical surface incident (making things convenient for the incident light debugging); Get into glass, to the inclined-plane, get into the ground floor polarization beam splitter with Brewster angle incidence; The P transmittance; S light reflection, P light once more with Brewster angle incidence to the second polarization spectro rete, P light is vertically from the vertical transmission of another prism surface; The outgoing from the side of S polarized light.
Description of drawings
Fig. 1 is one of structural representation of a kind of ultraviolet high-performance polarization splitting prism of the present invention.
Embodiment
Like Fig. 1, choose the optical glass ultraviolet and melt quartz, be processed into two same right- angle prisms 101 and 102, an angle θ of right-angle prism is the Brewster angle; The mirror polish of face 201 to 206; Face 203 and 206 is coated with polarization beam splitter, and incident angle is a Brewster angle, goes out incident medium to be: melt quartzy to air; Two Brewster face 203,206 butt joints adopt air-gap to connect, and the air chamber damage threshold is high; Face 201,202,204,205 in addition, the plating anti-reflection film reduces the surface reflection loss.
According to refraction law, another angle beta is processed into (180 °-2 θ), guarantees the 202 vertical outgoing from the side of S polarized light.
Light path is: the incident of incidence natural lights vertical plane; Vertical surface goes into to inject glass, to the inclined-plane, gets into the ground floor polarization beam splitter with Brewster angle incidence; The P transmittance; S light reflection, P light once more with Brewster angle incidence to the second polarization spectro rete, P light is vertically from the vertical transmission of another prism surface; The vertical from the side outgoing of S polarized light.
For example: wavelength is 355nm, this moment θ=55.9 °, β=68.2 °, the extinction ratio of the polarization beam splitter of individual layer reaches 200:1.
Claims (3)
1. a ultraviolet high-performance polarization splitting prism comprises that an angle is processed into the triangular prism of Brewster angle, it is characterized in that the Brewster face of said triangular prism is coated with polarization beam splitter.
2. a kind of ultraviolet high-performance polarization splitting prism according to claim 1 is characterized in that said two Brewster faces adopt air-gap to connect.
3. a kind of ultraviolet high-performance polarization splitting prism according to claim 1, the angle that it is characterized in that said a pair of triangular prism all is a Brewster angle, the another one angle can be the right angle, also can be arbitrarily angled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205019152U CN202362477U (en) | 2011-12-06 | 2011-12-06 | Ultraviolet high-performance polarization beam-splitting prism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205019152U CN202362477U (en) | 2011-12-06 | 2011-12-06 | Ultraviolet high-performance polarization beam-splitting prism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202362477U true CN202362477U (en) | 2012-08-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205019152U Expired - Fee Related CN202362477U (en) | 2011-12-06 | 2011-12-06 | Ultraviolet high-performance polarization beam-splitting prism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202362477U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102495437A (en) * | 2011-12-06 | 2012-06-13 | 福建福晶科技股份有限公司 | Ultraviolet high-performance polarization light splitting prism |
| CN110927985A (en) * | 2019-12-19 | 2020-03-27 | 福建福特科光电股份有限公司 | Depolarization beam splitting device with air gap structure |
-
2011
- 2011-12-06 CN CN2011205019152U patent/CN202362477U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102495437A (en) * | 2011-12-06 | 2012-06-13 | 福建福晶科技股份有限公司 | Ultraviolet high-performance polarization light splitting prism |
| CN110927985A (en) * | 2019-12-19 | 2020-03-27 | 福建福特科光电股份有限公司 | Depolarization beam splitting device with air gap structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120801 Termination date: 20151206 |
|
| EXPY | Termination of patent right or utility model |