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Process for producing periodicity field reverse of Gd2 (MoO4)3 crystal

A technology of domain inversion and periodicity, applied in the field of realizing periodic domain inversion of Gd23 crystal, can solve the problems of low accuracy and inability to achieve periodic phase matching of micro-regions, and achieve the effect of quasi-phase matching.

Inactive Publication Date: 2005-01-05
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

Their disadvantage is that they cannot achieve periodic phase matching of micro-regions (only on the order of microns), and the accuracy is not very high.

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  • Process for producing periodicity field reverse of Gd2 (MoO4)3 crystal

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Embodiment Construction

[0024] figure 1 It is the present invention that realizes Gd 2 (MoO 4 ) 3 Schematic of the laser system for the method of periodic domain inversion in crystals. The present invention utilizes femtosecond laser to realize Gd 2 (MoO 4 ) 3 The specific process flow of single crystal periodic domain inversion is as follows:

[0025] First set Gd 2 (MoO 4 ) 3 The single crystal is oriented, perpendicular to the [001] direction orienting the Gd 2 (MoO 4 ) 3 Cut into a single wafer with a certain thickness, after polishing (smoothness greater than grade III), perform monodomain treatment by annealing, and the crystal annealing temperature is 870±20°C;

[0026] Optical path adjustment, the titanium sapphire femtosecond laser is divided into two beams through the beam splitter, and then focused by the lens to reach 9-11J / cm 2 The energy density, by adjusting the incident angle between the two beams of light, adjust the width of the interference fringes;

[0027] Place t...

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Abstract

The invention is a method of implementing periodic domain inversion in Gd2(MoO4)3 crystal, and its characteristic: polishing Gd2(MoO4)3 crystal in the polarizing direction (001), splitting the super strong and super rapid laser into two laser beams by beam splitting piece, regulating the incident angles of the laser beams to change the space between interference stripes, and under the action of strong electric field of fly-second laser, implementing periodic domain inversion. The preparing process is simple and easy to operate, convenient to implement rapid and industrialized production, and this structural nonlinear optical crystal is suitable for the output of high-energy frequency-doubled laser.

Description

technical field [0001] The present invention and gadolinium molybdate (hereinafter referred to as Gd 2 (MoO 4 ) 3 ) crystals, especially one that realizes Gd 2 (MoO 4 ) 3 A method for periodic domain inversion in crystals. The periodic domain inversion of this crystal can be used for frequency doubling output of laser. Background technique [0002] In 1962, Bloembergen et al. put forward the theory of quasi phase matching (Quasi phase matching, hereinafter referred to as QPM): through the periodic modulation of the nonlinear susceptibility of the crystal (periodic domain inversion) to compensate for the fundamental wave and phase caused by the refractive index dispersion. The phase mismatch between harmonics has been enhanced by nonlinear optical effects. Replacing homogeneous materials with microstructured materials and using QPM to achieve enhanced laser frequency-doubling conversion efficiency is technically very attractive. The use of crystal periodic domain inve...

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Application Information

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IPC IPC(8): C30B29/32C30B33/00
Inventor 姜本学潘守夔赵志伟徐军张连翰
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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