Paper
14 February 2007 Compact sub-mW mid-infrared DFG laser source using direct-bonded QPM-LN ridge waveguide and laser diodes
Osamu Tadanaga, Yoshiki Nishida, Tsutomu Yanagawa, Katsuaki Magari, Takeshi Umeki, Masaki Asobe, Hiroyuki Suzuki
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Abstract
We report compact sub-mW mid-infrared (IR) laser sources based on difference frequency generation (DFG) in a quasiphase matched (QPM) LiNbO3 (LN) waveguide directly pumped with two laser diodes (LDs). The mid-IR lasers operate in the cw mode at ambient temperatures, and can be used for the tunable diode laser absorption spectroscopy (TDLAS). To construct the mid-IR laser sources, we employed a fiber-pigtailed wavelength conversion module, which we spliced to a direct-bonded QPM-LN ridge waveguide by using the V-groove connection technique. The modules had high external conversion efficiencies of 10 and 16 %/W for 3.4 and 2.6 &mgr;m, respectively. The signal was obtained from a 1.55-&mgr;m-band distributed feedback (DFB)-LD, and the pump from a single-mode LD stabilized with a fiber-Bragg-grating (FBG). We used 1.064 and 0.976-&mgr;m pump LDs for 3.4 and 2.6-(micron)m generation, respectively. The two LDs and the wavelength converter were assembled with a polarization maintaining fiber, and then packaged in a box. We obtained high outputs of up to 0.20 mW for the 3.4-&mgr;m laser source and 0.33 mW for the 2.6-&mgr;m laser source, and detected CH4 and H2O absorption lines with the 3.4 and 2.6-&mgr;m laser light sources, respectively.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Osamu Tadanaga, Yoshiki Nishida, Tsutomu Yanagawa, Katsuaki Magari, Takeshi Umeki, Masaki Asobe, and Hiroyuki Suzuki "Compact sub-mW mid-infrared DFG laser source using direct-bonded QPM-LN ridge waveguide and laser diodes", Proc. SPIE 6455, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VI, 64550D (14 February 2007); https://doi.org/10.1117/12.699753
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Cited by 4 scholarly publications.
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KEYWORDS
Mid-IR

Laser sources

Waveguides

Absorption

Laser development

Semiconductor lasers

Modulation

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