Ultrabroadband tunable continuous-wave difference-frequency generation in periodically poled lithium niobate waveguides |
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Authors: | Cao Zhensong Han Ling Liang Wanguo Deng Lunhua Wang Huan Xu Changqing Zhang Weijun Gong Zhiben Gao Xiaoming |
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Institution: | Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China. |
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Abstract: | 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. |
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