Lithium triborate crystal surface antireflective microstructure and preparation method thereof

A lithium triborate, crystal surface technology, applied in crystal growth, chemical instruments and methods, single crystal growth, etc., to achieve the effect of improving anti-laser damage performance

Inactive Publication Date: 2019-09-13
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At present, this microstructure anti-reflection method is mainly used in fused silica and semiconductor substrate materials, and does not involve nonlinear optical crystal materials, and the wavelengths used are mostly in the infrared band

Method used

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  • Lithium triborate crystal surface antireflective microstructure and preparation method thereof
  • Lithium triborate crystal surface antireflective microstructure and preparation method thereof
  • Lithium triborate crystal surface antireflective microstructure and preparation method thereof

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with specific embodiments.

[0027] Since lithium triborate crystals are usually used for frequency conversion, the requirement is to have high transmittance to the input wavelength and output wavelength. The present invention uses the surface anti-reflection microstructure applied to two wavelengths of 1064nm and 532nm as an example. The microstructure is a periodic array structure directly prepared on the substrate, and the microstructure parameters include period, depth, duty cycle and the like.

[0028] In this example, figure 1 It is a schematic diagram of the anti-reflection microstructure on the surface of lithium triborate crystal in the embodiment of the present invention. In the figure, Λ is the period of the microstructure, H is the depth of the microstructure, d is the diameter of the top of the microstructure, D is the diameter of the bottom of the microstructure, and the duty ratio of th...

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Abstract

The invention relates to a lithium triborate crystal surface antireflective microstructure, which has antireflective effect on ultraviolet, visible and near-infrared light. The microstructure parameters include period, depth, duty cycle, etc. All units of the microstructure are cuboid, cylindrical, conical or truncated cone structures. The microstructure parameters and the shapes of all the unitsare determined by specific use wavelength. The surface antireflective microstructure provided by the invention can effectively improve the transmittance of lithium triborate crystals at specific wavelength, and has very wide transmission bandwidth, well satisfies the requirements of high transmittance and bandwidth, and has very important practical significance for high power laser systems.

Description

technical field [0001] The invention belongs to the field of optical element manufacturing, in particular to a lithium triborate (LiB 3 o 5 , LBO) surface anti-reflection microstructure and its preparation method. Background technique [0002] Lithium triborate (LiB 3 o 5 , LBO) crystal is a kind of nonlinear optical crystal with excellent performance, which has the advantages of wide transmission band, wide acceptance angle, small dispersion angle, high frequency doubling conversion efficiency and high laser damage threshold. The fields of power laser sum frequency, frequency doubling and optical parametric oscillation have broad application prospects. Residual reflection on the crystal surface not only causes light loss, but also may lead to damage or failure of optical components in high-precision optical systems. In order to reduce the interface Fresnel reflection, the commonly used method is to coat the surface of the base material with an optical anti-reflection c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B33/08
CPCC30B29/22C30B33/08
Inventor 孔钒宇孙勇贺洪波晋云霞曹红超张益彬王勇禄
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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