Open AccessContinuous-wave difference-frequency generation based on BaGa4Se7 crystal
Author(s) -
Mingguang Sun,
Zhensong Cao,
Jiyong Yao,
Hongjuan Ma,
Yangwu Guo,
Xiaoming Gao,
Rui-Zhong Rao,
Yicheng Wu
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.004014
Subject(s) - continuous wave , optics , energy conversion efficiency , crystal (programming language) , materials science , laser , bandwidth (computing) , wavelength , sapphire , phase matching , physics , optoelectronics , computer science , programming language , computer network
A continuous-wave mid-infrared radiation from difference frequency generation by mixing a continuous-wave Ti: sapphire laser and a continuous-wave YAG laser in a 15 mm long BaGa 4 Se 7 crystal is demonstrated for the first time. The tunable range from 3.15 to 7.92 μm was achieved by rotating the crystal to fulfill the type I phase-matching condition. A maximum DFG power of 1.41 μW was obtained at 5 μm. Meanwhile the experimental DFG power conversion efficiency was 20.2 μW/W 2 , with a length-normalized slope efficiency of 15.5 μW/cmW 2 . The conversion efficiency decreases rapidly from 50 μW/cmW 2 at 3.15 μm to 1 μW/cmW 2 at 7.92 μm. The wavelength acceptance bandwidth and the angular acceptance bandwidth were measured to be 16.4 cm -1 and 44' for DFG at 5.1 μm, respectively.