title: Widely tunable continuous-wave mid-infrared radiation (5.5-11 microm) by difference-frequency generation in LiInS2 crystal.
abstract: The first demonstration, to the best of our knowledge, of continuous-wave (cw) difference-frequency generation (DFG) in LiInS2 crystal is reported. Wide spectral coverage (5.5-11.3 microm) has been obtained with angle and wavelength tuning for type II (eoe) critically phase-matched parametric interaction. The phase-matching conditions in cw DFG have been investigated, which allowed us to improve the Sellmeier parameters by use of a two-pole dispersion equation. An effective nonlinear coefficient deff = 6.9 +/- 0.8 pm/V has been determined at approximately 7 microm relative to the well-known nonlinear coefficient d36 of AgGaS2, which yields a power-conversion efficiency of approximately 12.4 microW/(W2 cm). We evaluated the high-resolution spectral characteristics of the DFG source by recording C2H2 and SO2 spectra.
authors: Laboratoire de Physicochimie de l'Atmosphere (Unité Mixte de Recherche, Centre National de la Recherche Scientifique 8101), Université du Littoral Côte d'Opale, 189A, Avenue Maurice Schuman, 59140 Dunkerque, France. chen@univ-littoral.fr
authors: Weidong
authors: W
authors: Chen
authors: Emmanuelle
authors: E
authors: Poullet
authors: Jean
authors: J
authors: Burie
authors: Daniel
authors: D
authors: Boucher
authors: Markus W
authors: MW
authors: Sigrist
authors: Jean-Jacques
authors: JJ
authors: Zondy
authors: Ludmila
authors: L
authors: Isaenko
authors: Alexander
authors: A
authors: Yèlisseyev
authors: Sergei
authors: S
authors: Lobanov