一种新型自激活激光晶体材料

A New Self-Activated Laser Crystal Material

采用提拉法生长了尺寸为30mm×60mm的自激活NdTaO4(NTO)晶体,用Rietveld全谱拟合方法对晶体的结构进行研究,结果表明,该晶体为单斜晶系,空间群为I2/a,给出了晶体的晶格常数和密度。对晶体的室温吸收和发射光谱研究表明,其在808.5nm和885nm有很强的宽带吸收,在1063.5nm波段呈现明显的宽带荧光发射,有利于发展激光二极管(LD)抽运的可调谐或超短激光。该晶体有望发展成为一种高增益的自激活微片激光增益介质。

A new self-activated NdTaO4 （NTO） crystal with the size of 30 mm×60 mm is grown by Czochralski method, and its crystal structure is investigated by the Rietveld full-profile fitting method. The grown NTO crystal shows the monoclinic system, space group I2/a, and lattice constants and density are also given. The room temperature absorption and emission spectra of NTO crystal are studied. The strong broadband absorption peaks at 808.5 nm and 885 nm and the obvious broadband emission at 1063.5 nm are suitable for the laser diode （LD） pumped tunable laser or ultrashort laser. The NTO crystal can be used as a high gain self-activated microchip laser medium.