Alpha-BBO polarizing prism

A technology of BBO and polarizing prism, which is applied in the field of structural design and material selection of optical components, can solve the problems of strong absorption, poor extinction ratio, small incident angle, etc., and achieve large acceptance angle, high extinction ratio, and transmittance high effect

Active Publication Date: 2011-06-15
FUJIAN CASTECH CRYSTALS
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Problems solved by technology

[0003] At present, in the optical field of the visible and near-infrared spectral ranges, the polarizing prisms generally used are Glan laser, Glan Taylor or Glan Thomson prisms made of Iceland stone crystals, but Iceland stone is natural, and the internal The quality and source of materials have become the key factors affecting the production of polarizing devices; the applicable wavelength range of icelandite polarizers is 350-2300nm, and cannot be applied to ultraviolet light; moreover, icelandite crystals are rhombohedral, and the requirements for the optical axis of polarizers make crystals Low utilization rate, easy processing and cleavage, low hardness is not suitable for polishing and other processing
[0004] In addition, the currently applicable visible to mid-infrared polarizer is YVO 4 Fabricated Air-Spaced Glan Laser Prism, YVO 4 The crysta

Method used

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Embodiment 1

[0013] Embodiment one: if image 3 , the optical axes of the two α-BBO crystal prisms that make up the polarizer are perpendicular to the o light overflow surface (B and E planes), and in the entire wavelength band, according to the law of refraction, the law of total reflection, SellmeierEquation of α-BBO crystal and LiF crystal Refractive index, the apex angle of the prism can be obtained as 57.8°±0.2°: the α-BBO crystal is directional cut into a right-angle trapezoidal prism (or right-angle prism) with an apex angle of 57.8°±0.2°, A, B, C, D , E, and F surfaces are all polished, A, B, D, and E four surfaces can be coated with anti-reflection coating; the LiF crystal is cut into a window structure, and the C and F surfaces combined with the α-BBO crystal prism are polished, strictly Control indicators such as smoothness, and the thickness should be as thin as possible. Then two α-BBO crystal rectangular trapezoidal prisms and a LiF crystal window were image 3 The optical ...

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Abstract

The invention relates to an alpha-barium boron oxide (alpha-BBO) polarizing prism. During material selection, a crystalline material, namely LiF crystals with the highest vacuum ultraviolet-far infrared transmittance, the best ultraviolet-far infrared crystalline materials, namely alpha-BBO crystals, for making a polarizing prism, and LiF crystals with extremely low refractive index are particularly selected. During design, a cuboid hamburger structure connected by two alpha-BBO crystal prisms and a piece of LiF window optical cement is adopted, a light path is completely glue-free, the transmittance is high, the vertex angles of the two alpha-BBO crystal prisms are 57.8+/-0.2 degrees, an optical axis of the alpha-BBO polarizing prism is vertical to an o-light spilling plane, the o-light is totally spilt from the side face, the volume is small, the wavelength coverage range is between 0.19 and 3.5 mu m, the total incident angle of the o-light and e-light is more than 11 degrees in the whole wavelength range, the extinction ratio is less than 5*10<-6>, and the transmittance is high.

Description

【Technical field】 [0001] The invention belongs to the field of structural design and material selection of optical elements, and in particular relates to an α-BBO polarizer. 【technical background】 [0002] With the rapid development of ultraviolet optical technology, especially ultraviolet and deep ultraviolet testing and processing instruments, ultraviolet polarizing devices have always been the object of people's attention. It is one of the core components of some ultraviolet testing and processing instruments, such as ultraviolet-visible light spectrophotometry , ellipsometer, etc. [0003] At present, in the optical field of the visible and near-infrared spectral ranges, the polarizing prisms generally used are Glan laser, Glan Taylor or Glan Thomson prisms made of Iceland stone crystals, but Iceland stone is natural, and the internal The quality and source of materials have become the key factors affecting the production of polarizing devices; the applicable wavelength...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02B1/08
Inventor 朱一村郑熠邓雷磊吴少凡
Owner FUJIAN CASTECH CRYSTALS
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