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Air gap type BBO (Barium Boron Oxide) laser polarizing prism

A technology of polarizing prism and air gap, applied in the field of polarizing prism

Inactive Publication Date: 2011-09-28
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to meet the requirements of high-power light use, the present invention solves the structural design problem of high-power laser polarizing prisms, and provides a crystal polarizing prism design method using air gap polarization, which can meet the requirements of 1GW / cm 2 The following optical power density requirements

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  • Air gap type BBO (Barium Boron Oxide) laser polarizing prism

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Embodiment Construction

[0010] As shown in the figure, the device of the present invention is composed of a rectangular prism 2 and an organic film spacer 1 . Select optical high-quality BBO single crystal, determine the crystal optical axis direction 4, make a long blank with a square or regular polygonal light end surface, cut the blank along the side, and divide it into two right-angle prisms, two right-angle prisms The size can be different, but the wedge angle S of the two right-angle prisms should be consistent during the grinding and polishing process; the right-angle prisms should be treated with moisture-proof after polishing, and a moisture-proof film with a thickness of about 150nm should be vacuum-plated on the polished surface. An elliptical hole is opened in the center of the organic thin film spacer layer 1, the ratio of the long and short axes of the ellipse is 1.3, and the distance between the ellipse and the periphery of the thin film spacer layer is 1mm. As shown in the figure, the...

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Abstract

The invention relates to a design of a polarizing prism, comprising a right-angle prism design and a film spacer layer option, wherein the crystal optical axis direction of the right-angle prism is parallel to the plane of a normal of an inclined surface and vertical to a normal of an end surface, and a wedge angle of the right-angle prism falls within a range of 38.10-39.30 degrees; and the film spacer layer is an organic film which is 50-100 microns thick, an elliptical hole is formed in the middle of the film spacer layer, and the proportion between the longer axis and the shorter axis of the ellipse is 1.3. A BBO (Barium Boron Oxide) crystal is cut according to requirements on the optical axis direction to be made into two right-angle prisms; and incident end surfaces and inclined surfaces of the prisms both need to be polished and plated with moisture-proof films. The device provided by the invention is applicable to lights within a wavelength range of 250-35000 nm and has the characteristics of extinction ratio of superior to 1x(10)-5 and photo damage resistance threshold of 1.2 GW / cm2; and the angle range of light incidence from -0.6 degree and +0.6 degree is allowed while the device is used within the wavelength of 250-35000 nm. The transmittance and the photo damage resistance of the laser polarizing prism are superior to those of a calcite polarizing prism.

Description

Technical field: [0001] The invention relates to a polarizing prism, in particular to a crystal polarizing prism with an air-gap design suitable for high-power lasers. Background technique: [0002] At present, polarizing prisms are mainly designed with calcite birefringent crystals, and two different combinations of air gap and glue are used. The former has a significantly higher anti-light damage threshold than the latter, but it is greater than 400MW / cm 2 Above use, the calcite material will be unbearable. α-BBO single crystal material has a GW-level anti-light damage threshold, good physical and chemical properties, and can withstand the impact of high-power lasers. Moreover, α-BBO materials have a wider transmission wavelength range than calcite and other materials, especially in The transmittance is stronger at short wavelengths, and it is suitable for making polarizing prisms used in high-power lasers. [0003] According to the characteristics of high-power lasers, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/04G02B1/04
Inventor 宋连科
Owner QUFU NORMAL UNIV
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