Highly efficient continuous-wave mid-infrared generation based on intracavity difference frequency mixing  

作　　者：Cheng Xi Peng Wang Xiao Li Zejin Liu 

机构地区：[1]College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China [2]State Key Laboratory of Pulsed Power Laser Technology,Changsha 410073,China [3]Hunan Provincial Key Laboratory of High Energy Laser Technology,Changsha 410073,China

出　　处：《High Power Laser Science and Engineering》2019年第4期62-66,共5页高功率激光科学与工程（英文版）

基　　金：supported by the Open Research Fund of State Key Laboratory of Pulsed Power Laser Technology;China(No.SKL2017KF04)。

摘　　要：We report on a new scheme for efficient continuous-wave(CW)mid-infrared generation using difference frequency generation(DFG)inside a periodically poled lithium niobate(PPLN)-based optical parametric oscillator(OPO).The pump sources were two CW fiber lasers fixed at 1018 nm and 1080 nm.One worked as the assisted laser to build parametric oscillation and generate an oscillating signal beam while the other worked at low power(3 W)to induce DFG between it and the signal beam.The PPLN temperature was appropriately adjusted to enable OPO and DFG to synchronously meet phase-matching conditions.Finally,both low-power 1018 nm and 1080 nm pump beams were successfully converted to 3.1μm and 3.7μm idler beams,respectively.The conversion efficiencies of the 1018 nm and 1080 nm pumped DFG reached 20% and 15%,respectively,while their slope efficiencies reached 19.6% and 15%.All these data were comparable to the OPOs pumped by themselves and never realized before in traditional CW DFG schemes.The results reveal that high-efficiency frequency down-conversion can be achieved with a low-power nearinfrared pump source.

关 键 词：difference frequency generation nonlinear wave mixing optical parametric oscillator 

分 类 号：TH744[机械工程—光学工程]