Double Brewster's angle nonlinear optical crystal and cutting method thereof

A technology of nonlinear optics and Brewster angles, applied in the field of double Brewster angle nonlinear optical crystals and their cutting, can solve problems such as reflection loss, and achieve the effect of avoiding surface damage

Inactive Publication Date: 2008-10-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the quadruple-frequency light generated at this time is vertically polarized to the incident surface of the output end, and there is a 20% reflection loss through the uncoated output surface

Method used

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  • Double Brewster's angle nonlinear optical crystal and cutting method thereof
  • Double Brewster's angle nonlinear optical crystal and cutting method thereof
  • Double Brewster's angle nonlinear optical crystal and cutting method thereof

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Effect test

Embodiment 1

[0027] exist image 3 Among them, the LBO crystal 4 is a type I phase matching and frequency crystal, which adopts figure 1 The light input and output surfaces shown are cut according to Brewster's angle θ, and the incident beam 5 is a mixed beam of 1064nm infrared light and 532nm green light, which is incident at a special angle of Brewster's angle according to the incident light To the light input surface cut according to the Brewster angle, the reflected light and the refracted light are perpendicular to each other, the mixed light beam 5 is incident on the light input surface at the Brewster angle θ, so that the 1064nm infrared light and The polarization direction of 532nm green light is parallel to the front view plane (such as image 3 As shown in b), it is transmitted into the LBO crystal 4 without reflection loss, and a type I phase-matched sum frequency occurs, and the outgoing light 6 of 355nm sum frequency light (ultraviolet light) is generated. The polarization d...

Embodiment 2

[0029] Such as Figure 4 In the schematic diagram of the quadruple frequency doubling scheme shown, the cavity mirror M1 has a high reflectivity, and the output cavity mirror M2 has a reflectivity of 90%, and the two form a resonant cavity 8 . The Nd-YVO4 laser crystal between M1 and M2 is pumped by two laser pumping sources LD that generate pump light with a wavelength of 808nm, and the incident light 5 generated is infrared light with a wavelength of 1064nm. Q-Swithch stands for an optical Q-switched crystal, which is used to generate laser pulses. LBO crystal 4 is a type-I phase-matching frequency-doubling crystal, which generates 532nm green light by frequency doubling 1064nm laser, and CLBO crystal 7 is a type-I phase-matching frequency-doubling crystal, which generates 266nm ultraviolet light 6 by frequency doubling 532nm green light. Both LBO crystal 4 and CLBO crystal 7 are cut according to the double Brewster angle θ.

[0030] The polarization direction of the 1064n...

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Abstract

The present invention provides a dual-brewster angle nonlinear optical crystal belonging to laser technical field, and its cutting method. The dual-brewster angle nonlinear optical crystal includes an aperture entrance plane, an aperture exiting plane; the aperture entrance plane and the aperture exiting plane aim at the design of the emitting light to be transformed and the emergent light obtained by the non-linear optical transform respectively, the aperture entrance plane and the aperture existing plane process cut to the non-linear optical crystal according to the brewster angle, so as to meet incident angle as a brewster angle when the input light to be transformed emits on the light entrance plane and the exiting light produced by the non-linear transformation outputs by the light exiting plane, the aperture entrance plane and the aperture exiting plane without plating antireflection coatings ensure the incident light to be transformed pass through the entrance plane without loss, the emitting light obtained by transformation passes through the exiting end without loss, the antireflection effect of the emitting light by the exiting plane enhances anti-damaging ability of the nonlinear crystal, avoiding the loss of the nonlinear crystal.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a double Brewster angle nonlinear optical crystal and a cutting method thereof which avoid damage to the nonlinear optical crystal. Background technique [0002] The optical materials used in the nonlinear optical frequency conversion technology face serious damage problems under the condition of continuous operation for a long time. Moreover, in order to make the laser beam pass through the nonlinear crystal without loss, the optical anti-reflection coating will be coated on the input surface and output surface of the light transmission surface, but the damage of the optical film is particularly serious. Especially for nonlinear optical crystals that produce green light, ultraviolet light, and deep ultraviolet light, how to effectively prevent surface damage has become the key to nonlinear optical frequency conversion technology. [0003] Ming Lai, Shui Lai and Zhimi...

Claims

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Application Information

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IPC IPC(8): G02F1/35G02F1/355
Inventor 巩马理闫平黄磊黄雪柳强张海涛
Owner TSINGHUA UNIV
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