26 January 2018 Compact and low power-consumption MIR DFB-QCL with To-CAN package for portable sensor
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Sensing method with Quantum Cascade Laser (QCL) as a light source is expected to offer a high sensitivity, a short measurement time, and a good portability compared to conventional methods. However, commercially available QCLs have high power-consumption of several W. Therefore, a large power supply is required to drive QCL, and most of the input power is released as heat, leading to the necessity for a large cooling system. For these reasons, portable gas sensors using QCL have not been realized. To address this issue, we had recently developed a low power-consumption DFB-QCL in the 7μm wavelength region. In this study, we developed a compact and low power consumption QCL module with Φ 15.4 mm To-CAN package. The QCL device, a thermoelectric cooler (TEC), a thermistor and a window were assembled in this package. The threshold power-consumption and the maximum output power were 0.97 W and 37 mW at 20°C, respectively under continuous wave driving. In addition, it maintained a single mode operation between 20°C and 80°C without a mode hopping. The performance of this QCL module as a light source for gas sensing was evaluated by measuring the mid-infrared absorption spectrum of the methane gas with a multi pass type gas cell. High sensitive methane gas detection was achieved, which was comparable to that of the conventional high heat load (HHL) packaged QCL module reported by other group. It is expected that a compact and low-cost MIR gas sensor with high-sensitivity can be realized with our QCL module.
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Makoto Murata, Makoto Murata, Hiroyuki Yoshinaga, Hiroyuki Yoshinaga, Masaki Migita, Masaki Migita, Hiroki Mori, Hiroki Mori, Yukihiro Tsuji, Yukihiro Tsuji, Takashi Kato, Takashi Kato, Jun-ichi Hashimoto, Jun-ichi Hashimoto, Mitsuru Ekawa, Mitsuru Ekawa, Yasuhiro Iguchi, Yasuhiro Iguchi, Tsukuru Katsuyama, Tsukuru Katsuyama, } "Compact and low power-consumption MIR DFB-QCL with To-CAN package for portable sensor", Proc. SPIE 10540, Quantum Sensing and Nano Electronics and Photonics XV, 105401O (26 January 2018); doi: 10.1117/12.2287696; https://doi.org/10.1117/12.2287696

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