第22卷第1期 2014年1月
文章编号
1004-924X(2014)010039-05
光学精密工程
Optics and Precision Engineering
SrWO4晶体受激拉曼散射的各向异性
张芳，王正平，许心光“
（山东大学晶体材料国家重点实验室，山东济南250100）
Vol, 22No.1
Jan.2014
摘要：以四方晶系SrWO。晶体为例，研究其非主轴偏振配置的受激拉曼散射特性，用532nm皮秒脉冲激光作为泵浦源，以单次通过的方式研究了a切SrWO，晶体的受激拉曼散射增益随泵浦光偏振方向的变化，由此确定出拉曼增益的各向异性。针对由[WO了-四面体对称伸缩引起的924cm-的最强频移的实验显示：当人射光沿α轴和c轴偏振时，拉曼增益系数出现两个极大值，增益分别为10.1cm/GW和14.2cm/GW；当人射光沿&，c轴中分线方向偏振时，拉曼增益系数出现两个极小值，为7.1cm/GW，结合拉曼张量及非极性晶格振动模拉曼散射强度解释了上述物理现象，证明了实验结果与理论相符。
关键词：钨酸锶晶体；受激拉曼敏射；增益系数；各向异性
中图分类号：0734
文献标识码：A
doi:10.3788/OPE,20142201,0039
AnisotropyofstimulatedRamanscatteringinSrWO,crystal
ZHANG Fang,WANG Zheng-ping',XU Xin-guang
(StateKey Laboratory of Crystal Materials,Shandong University,Jinan 250100,China)
+Correspondingauthor,E-mail:zpwang@sdu.edu.cn,rgu@sdu.edu.cn
Abstract: The relationship between stimulated Raman scattering characteristics and the polarization direction of a pump light was researched by taking an a-cut SrWO, crystal which belongs to the tetra gonal crystal system as a research object. Using a 532 nm light as the pump source and a single pass-ing way as implementation, the anisotropy for the SRS' gain of a-cut SrWO, crystal was determined The experimental results on the strongest Raman frequency shifting of 924 cm1 come from the sym metrical stretching vibration of [WO, 2-tetrahedron show that the gain coefficients appear two maxi mum values of 10. 1 cm/GW and 14. 2 cm/GW respectively when the pump light is polarized on a and c axes, and the gain coefficients present two of the same minimal values of 7. 1 cm/GW when the pump light is polarized along the bisector of a and c axes. The results are interpreted using a Raman tensor and the nonpolar Raman scattering intensity theory, which demonstrates that experimental re sults in this paper are in good agreement with that of the theory.
Key words: SrWO, crystal; stimulated Raman scattering; gain coefficient; anisotropy
收稿日期：2013-05-21修订日期：2013-07-15
基金项目：国家自然科学基金资助项目（No.61178060）；教育部新世纪优秀人才计划资助项目（NCET-10-0552)；山
东省自然科学杰出青年基金资助项目(JQ201218)；山东大学自主创新基金资助项目(2012TS215）