摘要
为抑制光参量振荡器(Optical Parametric Oscillator,OPO)振荡过程中信号光和闲频光向泵浦光的逆转换,首次采用在L型OPO腔的支路中插入信号光倍频晶体LiB_(3)O_(5)的(简称LBO)的方式,实现了BaGa_(4)Se_(7)(BGSe)OPO闲频光的高转换效率输出,当泵浦激光(1.06μm)能量为115 mJ时,闲频光(3.5μm)能量为16.18 mJ,光光转换效率为14.06%,斜效率为18.4%,这是目前已知1.06μm激光泵浦BGSe OPO最高的转换效率。模拟了不同泵浦能量下L型腔中有无LBO晶体时BGSe OPO腔内的三波波形,并给出了闲频光在实验中的输出波形。与传统OPO腔相比,所提出的L型OPO腔(含倍频晶体)在大能量泵浦条件下抑制了逆转换,可获得更高的闲频光转换效率。
The LiB_(3)O_(5)(LBO)was inserted into the branch of the L-shaped BaGa_(4)Se_(7)(BGSe)optical parametric oscillator(OPO)to improve the conversion efficiency for the first time.When the pump laser energy is 115 mJ(1.06μm),the idler light(3.5μm)energy was 16.18 mJ,corresponding to the conversion efficiency of 14.06%,and the slope efficiency was 18.4%,which was the highest conversion efficiency of BGSe OPO pumped by 1μm laser.The signal,idler,and pump wave waveform in BGSe L OPO cavity with and without LBO crystals was simulated,and the output waveform of idler light was given.Compared with traditional OPO cavities,L-type OPO cavities(with frequency doubling crystals)suppress the inverse conversion under high-energy pumping conditions,achieving higher idle frequency light conversion efficiency.Objective The mid-infrared(IR)coherent sources in the 3-5μm have always been intensively demanded for a wide range of scientific and technological applications in remote sensing,spectrum analysis,materials diagnostics,aerospace fields,etc.Optical parametric oscillation is an attractive approach,especially when high energy and average power are demanded simultaneously.However,there is reverse conversion in the OPO cavity.When the pump energy is high,the signal light and idle frequency light generated are also strong.At this time,the signal light and idle frequency light will be converted to the pump light,which seriously affects the conversion efficiency of OPO.In addition,due to the high intensity of signal light in the cavity during the reverse conversion,it is easy to damage the nonlinear crystal or its coating.Therefore,how to suppress reverse conversion in the OPO cavity under high-energy pumping conditions and improve the conversion efficiency of OPO has always been the focus of research.Methods To suppress the inverse conversion in the OPO cavity,we proposed a method of inserting a frequency doubling crystal into the L-type OPO cavity to suppress the signal light intensity(Fig.1).All three mirrors of the L-shaped cav
作者
卞进田
孔辉
叶庆
姚吉勇
吕国瑞
徐海萍
周权
温凯华
Bian Jintian;Kong Hui;Ye Qing;Yao Jiyong;Lv Guorui;Xu Haiping;Zhou Quan;Wen Kaihua(State Key Laboratory of Pulsed Power Laser Technology,National University of Defense Technology,Hefei 230037,China;Anhui Laboratory of Advanced Laser Technology,Electronic Countermeasure Institute,National University of Defense Technology,Hefei 230037,China;Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073,China;Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2023年第6期142-150,共9页
Infrared and Laser Engineering
基金
脉冲功率激光技术国家重点实验室主任基金项目(2022ZR03)。
