擬似位相整合LiNbO_3リッジ導波路による高効率中赤外差周波発生 Highly Efficient Mid-Infrared Difference Frequency Generation Using a Quasi-Phase Matched LiNbO_3 Ridge Waveguide
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 NbO<SUB>3</SUB> (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 CH<SUB>4</SUB> gas and <SUP>12</SUP>CO/<SUP>13</SUP>CO 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.
レーザー研究 36(2), 64-69, 2008-02-15
The Laser Society of Japan