低频移拉曼模式多阶级联的1.7μm激光器  

1.7 μm laser with a low frequency shifted Raman mode cascade connection

作　　者：鲍玉朔 黄海涛 陈海伟 王飞 李子涵 Bao Yushuo;Huang Haitao;Chen Haiwei;Wang Fei;Li Zihan(School of Physics and Electronic Engineering,Jiangsu Normal University,Xuzhou 221116,China)

机构地区：[1]江苏师范大学物理与电子工程学院,江苏徐州221116

出　　处：《红外与激光工程》2022年第7期145-149,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金(61875077)。

摘　　要：基于固体介质的拉曼频率变换是产生新波段激光的有效技术方案。利用1 572 nm KTP光参量振荡器腔内泵浦KGW晶体,实现了1 616 nm (2阶)、1 638 nm (3阶)、1 662 nm (4阶)、1 686 nm (5阶)、1 711 nm (6阶)拉曼激光输出,其中1 711 nm占据主导地位。激光器最大总平均输出功率为1.13 W,最小脉冲宽度为20 ns。该多阶级联拉曼变频对应的单阶平均拉曼频移为86 cm^(-1),与文献报道的KGW晶体低频拉曼模式相吻合。采用1 572 nm KTP光参量振荡器作为拉曼激光器的腔内泵浦源有两个优势,一方面可以有效拓展拉曼变频的输出波长,另一方面可以基于光参量振荡器的脉冲窄化特性为后续多阶拉曼转换提供高强度的泵浦光。通过引入多阶级联拉曼变频的方案,为有效利用固体介质非常规低频移拉曼模式提供了新思路。Raman frequency conversion based on a solid medium is an effective technical scheme to generate new wavelength laser.1 572 nm KTP optical parametric oscillator was used to pump the KGW crystal intracavity,and Raman laser output at 1 616 nm(2nd-order),1 638 nm(3rd-order),1 662 nm(4th-order),1 686 nm(5th-order) and1 711 nm(6th-order) was realized,among which 1 711 nm is dominant.The maximum total average output power of the laser is 1.13 W,the minimum pulse width is 20 ns.The single-order average Raman frequency shift corresponding to the multiorder cascade Raman frequency conversion is 86 cm^(-1),which is consistent with the low-frequency Raman mode of the KGW crystal reported in the literature.Using a 1 572 nm KTP optical parametric oscillator as the intracavity pump source of the Raman laser has two advantages:On the one hand,it can effectively expand the output wavelength of Raman frequency conversion;on the other hand,it can provide high-intensity pump light for subsequent multiorder Raman conversion based on the pulse narrowing characteristics of the optical parametric oscillator.By introducing the multi-order Raman frequency conversion scheme,a new idea is provided for the effective use of the unconventional low-frequency shift Raman mode of a solid medium.

关 键 词：级联非线性频率变换 KGW晶体 多阶受激拉曼散射 1.7μm 

分 类 号：O437[机械工程—光学工程]