Widely phase-matched tunable difference-frequency generation in periodically poled LiNbO3 crystal |
| |
Authors: | L.H. Deng X.M. Gao Z.S. Cao Y.Q. Yuan Z.B. Gong |
| |
Affiliation: | a Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, PR China b Laboratoire de Physicochimie de l’Atmosphre, Universite du littoral Côte d’Opale, 145 AV. Maurice Schumann, 59140 Dunkerque, France |
| |
Abstract: | We report on the development of a laser source in the mid-infrared spectral region based on difference-frequency generation (DFG) in a periodically poled LiNbO3 (PPLN) crystal. Continuously tunable coherent radiation from 2.75 to 4.78 μm was produced by optical parametric interaction between a diode-pumped monolithic continuous-wave (CW) Nd:YAG laser operating at 1.064 μm and a CW Ti:Sapphire laser tunable from 767 to 871 nm. Temperature-dependent quasi-phase-matched DFG wavelength acceptance bandwidth was studied and characterized. An empiric formula is given to estimate the phase-matched wavelength acceptance bandwidth as a function of the crystal temperature at Λ = 22.5 μm. A large frequency scan of 128 cm−1 (about 78 cm−1 above 1 μW) near 4.2 μm was achieved. The whole absorption spectrum of the P and R branches of the ν3 band of atmospheric carbon dioxide has been recorded with a single phase-matched frequency scan. |
| |
Keywords: | Difference-frequency generation Periodically poled LiNbO3 Atmospheric carbon dioxide |
本文献已被 ScienceDirect 等数据库收录! |