Highly Efficient Mid-Infrared Difference Frequency Generation Using a Quasi-Phase Matched Li NbO<SUB>3</SUB> Ridge Waveguide

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  • 擬似位相整合Li NbO<SUB>3</SUB>リッジ導波路による高効率中赤外差周波発生
  • 擬似位相整合LiNbO3リッジ導波路による高効率中赤外差周波発生
  • ギジ イソウ セイゴウ LiNbO3 リッジ ドウハロ ニ ヨル コウコウリツ チュウセキガイ サシュウハ ハッセイ

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Abstract

A laser source in mid-infrared (IR) range is needed for gas sensing because this wavelength range includes a large number of fundamental absorption bands of various atmospheric pollutants. Difference frequency generation (DFG) using quasi-phase matched Li NbO3 (QPM-LN) waveguides are promising for these laser source.In this review, we describe DFG characteristics of fabricated QPM-LN waveguides using direct-bonding technique.We achieved 40 and 100 %/W conversion efficiency for 3.2 and 2.3μm generation, respectively. Then, we demonstrated CH4 gas and 12CO/13CO isotopomer measurement using these waveguides. We also describe wavelength conversion module using V-groove connection technique. Finally, we report compact sub-m W mid-IR laser source, which did not employ a fiber amplifier or a high power solid-state laser.

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