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采用提拉法分别沿a轴、c轴生长了高光学质量的BaWO4晶体,最大尺寸为22mm×80mm,质量213g。利用分光光度计测量了BaWO4晶体的室温透过光谱,其短波透过限为260nm,长波透过限大于3200nm,因此,可在较宽波长范围内实现拉曼激光频移。以脉冲宽度为40ps的Nd:YAG锁模激光器作为激发源,研究了BaWO4晶体在外置谐振腔条件下的拉曼输出特性:对于c切、30mm长的晶体,多波长输出的总转换效率达到58%,最大输出能量为2.46mJ,1181nm一级斯托克斯拉曼输出的最高转换效率为41%,最大输出能量为0.92mJ;对于a切、50mm长的晶体,1325nm二级斯托克斯拉曼输出的最高转换效率为23%,最大输出能量为0.69mJ。实验表明:BaWO4晶体是一种优秀的近红外拉曼激光材料。
High-quality BaWO4 crystals were grown along the a-axis and c-axis respectively by Czochralski method with the maximum size of 22mm × 80mm and the mass of 213g. The room temperature transmission spectrum of BaWO4 crystal was measured by spectrophotometer. The short-wave transmission limit was 260nm and the long-wave transmission limit was greater than 3200nm. Therefore, Raman laser frequency shift could be realized in a wide wavelength range. The Raman output characteristics of the BaWO4 crystal under the condition of an external resonator were investigated by using a Nd: YAG mode-locked laser with a pulse width of 40 ps as the excitation source. The total conversion efficiency of the multiwavelength output of the crystal with 30 mm length was 58 %, The maximum output energy of 2.46mJ, 1181nm a Stokes Raman output maximum conversion efficiency of 41%, the maximum output power of 0.92mJ; a cut, 50mm long crystal, 1325nm secondary Stokes Raman output maximum conversion efficiency of 23%, the maximum output power of 0.69mJ. Experiments show that: BaWO4 crystal is an excellent near-infrared Raman laser material.