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Broadband difference frequency generation around 4.2 μm at overlapped phase-match conditions |
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| Authors: | Zhensong Cao Wanguo Liang Huan Wang Weidong Chen Zhiben Gong |
| Institution: | a Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China b Department of Engineering Physics, McMaster University, Hamilton, Ontario, Canada L8S 4L7 c Laboratoire de Physicochimie de l’Atmosphere, Universite du littoral Côte d’Opale, 189A, AV. Maurice Schumann, 59140 Dunkerque, France |
| Abstract: | Broadband difference frequency generation is theoretically and experimentally confirmed. It is shown that a wide tunable range of greater than 220 nm (FWHM) around 4.2 μm can be obtained in a 40 mm long periodically poled lithium niobate crystal with a single quasi-phase-matched period at a certain temperature. The broad bandwidth can be explained by means of the group-velocity matching or phase-mismatch minimization at overlapped phase-match conditions. The result shows that the broadband mid-infrared (mid-IR) laser source may find profound applications in trace gases detection of multiple atmospheric species and high resolution spectroscopy. |
| Keywords: | 42 65 Ky 42 60 42 62 Fi |
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