【摘要】 锶镉锗硒（SrCdGeSe₄）晶体是近期被发现的一种性能优异的新型红外非线性光学材料。本研究采用自制的双温区管式炉成功合成出SrCdGeSe₄多晶,单次合成量达到300 g;采用坩埚下降法首次生长出SrCdGeSe₄单晶,尺寸为■27 mm×80 mm;通过定向、切割和抛光等程序,得到几个不同尺寸的定向SrCdGeSe₄晶片,选取一片8×8×2 mm³双面抛光（110）晶片测试了摇摆曲线、红外透过光谱和激光损伤阈值。结果显示:（220）摇摆曲线半峰宽为44.8″,该晶体的短波透过截止边为596 nm,且在1～14μm波长范围内透过率超过68%;另外,晶体在Nd∶YAG脉冲激光,脉宽5 ns,重复频率1 Hz,光斑直径0.15 mm测试条件下,激光损伤阈值为530 MW/cm²。更多还原

【Abstract】 Strontium cadmium germanium selenide（SrCdGeSe₄） crystal is a new infrared nonlinear optical material with excellent performance which was discovered recently. In this study, polycrystalline SrCdGeSe₄ was synthesized successfully by using a self-made two-zone tube furnace with the amount of 300 g in one run. SrCdGeSe₄ single crystal with size of ■27 mm×80 mm was grown by vertical Bridgman-Stockbarger method for the first time. Several oriented SrCdGeSe₄ plates with different sizes were obtained after orienting, cutting, and polishing processes. Measurements of rocking curve, infrared transmission spectrum, and laser damage threshold were carried out on a polished（110） plate with 8×8×2 mm³ in size. The results show that the FWHM of the（220） peak rocking curve is 44.8″; the crystal has a short-wave cutoff of 596 nm, and has highly transparent within the wide range of 1-14 μm with the transmittance over 68%, and possesses a surface laser damage threshold of 530 MW/cm² using a Nd∶YAG laser under conditions of 5 ns pulse width, 1 Hz frequency, and D=0.15 mm spot size.更多还原