Ultrabroadband tunable continuous-wave difference-frequency generation in periodically poled lithium niobate waveguides.
We report, for what is the first time to our knowledge, widely tunable mid-IR light generation over a range of greater than 1000 nm in the 4 microm region by employing a single quasi-phase-matched periodically poled niobate waveguide at room temperature. The waveguide we used was fabricated by annealed proton exchange based on periodically poled lithium niobate. A peak conversion efficiency of 10%/W and a linewidth as small as 37 MHz were achieved. The developed mid-IR light generator may find wide applications in trace gas detection of multiple atmospheric species and high-resolution spectroscopy.
Cao
Zhensong
Z
Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
Han
Ling
L
Liang
Wanguo
W
Deng
Lunhua
L
Wang
Huan
H
Xu
Changqing
C
Zhang
Weijun
W
Gong
Zhiben
Z
Gao
Xiaoming
X