周期极化KTiOPO_4晶体和频单块非平面环形腔激光产生连续单频589nm黄光  

Continuous-wave single-frequency 589 nm yellow laser generated from sum frequency of single-block non-planar ring cavity laser in periodically poled KTiOPO_4 crystal

作　　者：谢仕永[1,2] 张小富[1] 杨程亮[2] 乐小云[1] 薄勇[3] 崔大复[3] 许祖彦[3] 

机构地区：[1]北京航空航天大学物理科学与核能工程学院,北京100191 [2]中国科学院长春光学精密机械与物理研究所,应用光学国家重点实验室,长春130033 [3]中国科学院理化技术研究所,激光物理与技术研究中心,北京100190

出　　处：《物理学报》2016年第9期76-82,共7页Acta Physica Sinica

基　　金：应用光学国家重点实验室资助的课题~~

摘　　要：单次通过周期极化KTiOPO_4晶体和频单块非平面环形腔1064 nm与1319 nm激光产生连续单频589 nm黄光.通过琼斯矩阵模拟计算对单块非平面Nd:YAG晶体参数进行了优化设计,实验获得1080 m W和580 m W的连续单频1064 nm和1319 nm激光输出.两束激光单次通过周期极化KTiOPO_4晶体和频产生14.8 m W,M^2=1.14的589 nm黄光,相应的和频效率为0.9%.研究了周期极化KTiOPO_4温度对和频效率的影响,得到其温度接收带宽为1.5?C.通过改变1064 nm Nd:YAG晶体的温度可实现589 nm黄光波长精确对应钠原子D_(2a)吸收谱线,调谐精度达到0.164 pm.Continuous-wave single-frequency 589 nm yellow laser can be used in laser cooling of sodium atoms.Besides,the interaction between 589 nm laser and sodium atoms can be studied by resonance fluorescence,which provides an important basis for the sodium guide star in the adaptive optics.In this paper,single frequency 589 nm yellow light is generated by sum frequency of single-block non-planar ring cavity 1064 nm and 1319 nm laser in periodically poled KTiOPO_4 crystal.The geometric parameters of single-block non-planar Nd：YAG crystal and magnetic field intensity are optimally designed by simulation calculation through using Jones matrix.The output powers 1080 m W and 580 m W are obtained for continuous-wave single-frequency 1064 nm and 1319 nm laser in the experiment,respectively The two fundamental beams are expanded to be the same as perfectly as possible in size and are focused into a spot with a size of about 60 μm by an achromatic lens.The sum-frequency generation takes place in a 1 mm×2 mm×20 mm phase-matched type-I periodically poled KTiOPO_4 crystal with a matching temperature of 55？C and polarization period of 12.35 μm The crystal is anti-reflection coated for all three wavelengths（1064 nm,1319 nm and 589 nm）.A 14.8 m W output of 589 nm laser is obtained with beam quality factor M^2= 1.14 and the corresponding sum-frequency efficiency is 0.9%.The influence of periodically poled KTiOPO_4 temperature on the sum-frequency efficiency is studied and the temperature acceptance bandwidth is measured to be 1.5 degrees The wavelength of 589 nm yellow light can be tuned to the sodium atom D_（2a） absorption line by changing the temperature of 1064 nm Nd：YAG crystal and 0.164 pm of tuning accuracy is reached.The whole laser system is stable and reliable,so it provides a practical and effective technical means to obtain the continuous-wave single-frequency 589 nm laser,for it is relatively simple and easy to implement.

关 键 词：单频黄光 单块非平面环形腔 和频 

分 类 号：TN24[电子电信—物理电子学]