Tunable continuous-wave mid-infrared radiation by laser difference-frequency generation in LiInSe2

W. Chen, E. Poullet, R. Bocquet, D. Boucher, M. W. Sigrist, J. J. Zondy, L. Isaenko, A. Yelisseyev, S. Lobanov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


We report on the first demonstration, to the best of our knowledge, of continuous-wave (cw) mid-infrared generation from laser difference-frequency mixing in a LiInSe2 crystal (lithium indium selenide, or LISe) in the X-Y plane. Two Ar+ laser-pumped Ti:Sapphire lasers were employed as widely tunable pump sources. A LiInSe2 crystal (7 mm × 6 mm × 9 mm) cut at φ = 54.75° and θ = 90° was used as frequency down-converter. The infrared spectral region of 6.2-7.5 Um has been covered with angle and wavelengths tuning by type II (eoe) critically phase-matched parametric interaction (Figure 1). The phase-matching (PM) conditions in the cw difference-frequency generation (DFG) process have been investigated. Based on the measurements of relative values of the power conversion efficiencies for LISe-and AgGaS2-based DFG, the effective nonlinear coefficient deffof 12.1 pm/V for LiInSe2 at ∼ 7 μm has been determined relative to the well known nonlinearity coefficient d36 of AgGaS2 [1], which yields a power conversion efficiency of about 29.8 μW/(W2.cm). The accessible infrared wavelength range is important for molecular spectroscopic studies and we will discuss the performance of this new laser source for trace gas sensing applications.

Original languageEnglish
Title of host publication2005 Conference on Lasers and Electro-Optics Europe
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages1
ISBN (Print)0780389743, 9780780389748
Publication statusPublished - 2005
Externally publishedYes
Event2005 Conference on Lasers and Elctro-Optics Europe - Munich, Germany
Duration: Jun 12 2005Jun 17 2005

Publication series

NameConference on Lasers and Electro-Optics Europe - Technical Digest


Other2005 Conference on Lasers and Elctro-Optics Europe

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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