Second-order nonlinear laser crystal N, N'-acetyl-(2-thenoyl) hydrazine crystal and preparation method and application thereof

Abstract

The invention provides a second-order nonlinear laser crystal N, N'-acetyl-(2-thenoyl) hydrazine crystal and a preparation method and application thereof. The crystal belongs to the orthorhombic crystal system, the space group is C<cc2>, the molecular formula is C7H8N2O2S, Mr equals to 184.21, the crystallography parameter is as follows: a equals to 14.027 angstroms, b equals to 15.572 angstroms, c equals to 8.1078 angstroms, V equals to 17771.0 cubic angstrom, and Z equals to 8, a molecule of the N, N'-acetyl-(2-thenoyl) hydrazine is formed by the N-(2-thenoyl) hydrazino plane and an acetyl plane which are mutually perpendicular; the preparation method of the hydrazine crystal comprises the following steps: acetyl is introduced onto the N-(2-thenoyl) hydrazine, then the produced N, N'-acetyl-(2-thenoyl) hydrazine is dissolved into the chloroform and methyl alcohol mixed solvent, the ration of chloroform and methyl alcohol both of the chloroform and methyl alcohol mixed solvent is 1 to 1, and the mixture is evaporated till approximate saturation under the room temperature, and is evaporated slowly under the temperature of 10 DEG C so as to obtain the tabular crystal N, N'-acetyl-(2-thenoyl) hydrazine crystal. According to the hydrazine crystal, the melting point of the crystal is high and reaches 180.5-181.5 DEG C, and the application range is wider.

Description

【Technical field】 [0001] The invention relates to a second-order nonlinear laser crystal N,N'-acetyl-(2-thienoyl)hydrazine crystal and its preparation method and application. 【Background technique】 [0002] When a light wave propagates in a nonlinear medium, it will cause nonlinear electrical polarization, resulting in a nonlinear interaction between light waves, and the nonlinear interaction between light waves caused by high-intensity lasers is more obvious. In the second-order frequency doubling process, once the fundamental frequency light enters the nonlinear optical crystal, every position on the optical path will generate a second-order polarized wave, and these polarized waves will emit the second harmonic of the same frequency. wave, or frequency doubled light wave. [0003] At present, the second-order nonlinear laser materials used at home and abroad mainly include the following types: [0004] 1. Potassium dihydrogen phosphate (KDP), the light wave interaction ...

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Problems solved by technology

[0012] But most organic crystals are soft, have a low melting point, and have too much birefringence, which limits their applications

[0013] The inventor once developed a growth method of a second-order nonlinear laser crystal 4-nitro-N-oxygen-2-pyridinecarboxylic acid second-generation crystal (molecular formula C 6 h 4 N 2 o 5 , referred to as POA-II), see Chinese invention patent number: ZL 200710008940.5, its crystal melting point is 162.5-163.5°C, better than POM, frequency doubling effect d eff / d KDP =9.8, the same order of magnitude as POM, calculated refractive index n max =1.6807,n min =1.5465, Δn=0.1342, which is better than POM, but the inventor is still not satisfied with its melting point, so he continued to research and develop this case.

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