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  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 2001),
  • paper CThL32

Yb fiber laser pumped mid-IR source based on difference frequency generation and its application to methane detection

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Abstract

A cw narrow-linewidth tunable mid-IR coherent source has become a useful tool for trace gas detection since almost all gases exhibit fundamental rovibrational absorption lines with high absorption strength in the mid-IR. This particular source is obtained by a difference frequency generation (DFG) technique which is that two near- 1R laser pump sources (λ1 λ2) are mixed to generate mid-IR (λ3 = (1/λ1–1/λ2)−1) in a quasi-phase-matched (QPM) nonlinear optical crystal such as a periodically poled LiNbO3 (PPLN) in single-pass geometry.

© 2001 Optical Society of America

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