抽运光偏振态对晶体两波耦合增益的影响  

Effect of Pump Beam Polarization on Two Waves Coupling Gain in Crystal

作　　者：郭庆林[1] 李彦[1] 张云英[1] 赵云[1] 李盼来[1] 哈艳[1] 

机构地区：[1]河北大学物理科学与技术学院,保定071002

出　　处：《人工晶体学报》2009年第3期648-651,661,共5页Journal of Synthetic Crystals

基　　金：河北省自然科学基金项目(F20060010023);河北省光电信息材料重点实验室资助项目

摘　　要：采用非同时读出条件下晶体两波耦合实验装置,以532 nm单频固体激光器为光源,研究了抽运光偏振态对Ce∶KNSBN晶体两波耦合有效增益的影响。结果表明:在信号光为e光且入射光夹角为30°条件下,当抽运光偏振态与e光夹角为10°时,有效增益最大;通过比较信号光打开与关闭条件下不同偏振态抽运光入射晶体时信号光及抽运光透射光强,分析得出最大增益存在的原因是偏振角为10°时抽运光的o光分量很好的起到了擦除光扇的作用,抑制了光扇的发生,从而增益最大。取抽运光偏振态与e光夹角为10°,研究入射光光强比对Ce∶KNSBN晶体两波耦合有效增益的影响,结果发现随入射光光强比的增大,有效增益先增大后减小,光强比为1∶50时对应的增益最大为33.8。同时对研究结果进行了相应的物理解释。Effect of pump beam polarization on two waves coupling gain was researched by using a non- synchronously-numerating experimental system, and the incident beam wavelength is 532 nm which originates from single frequency solid leaser. The results show that the gain reaches the peak value at 10° between the pump polarization and e signal beam under the condition of the incident angle between the signal and pump light is 30 °. Compared the transmission beam intensity of two waves coupling to only pump beam incident, the results illuminate that the ordinary beam play role of erasing the beam fanning at the polarization angle being 10°, so beam fanning is suppressed, and the gain was improved. The effect of incident beam intensity ratio on the two waves coupling effective gain was studied at the polarization angle being 10 °, the results express that the gain increases with increasing of the ratio, then decreases, and reaches the peak value 33.8 at 1：50. The results were explained physically.

关 键 词：Ce∶KNSBN晶体 两波耦合 偏振态 

分 类 号：O438[机械工程—光学工程]