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Trace gas monitor based on difference frequency generation at 4 μm using mass-production laser diodes as pump and signal light sources

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Abstract

New pump and signal laser sources for difference frequency generation (DFG) at 4 μm are described. A laser diode with a 980 nm fiber Bragg grating and a 785 nm Fabry-Perot (FP) laser diode were coupled into an optical fiber and mixed in a periodically poled Mg-doped lithium niobate (PPMgLN ) crystal, resulting in efficient mid-IR DFG. The DFG power was measured to be 0.23 μW for a pump power of 5 mW and a signal power of 50 mW with a slope efficiency of 0.92 mW/W2. A Doppler-broadened absorption spectrum of N2O at 2485.2 cm-1 (3.927 μm) was observed in a 0.1 m-long gas cell at a pressure of 133 Pa. The spectral linewidth of the DFG source was estimated to be 161 MHz (FWHM) for an averaging time of 700 ms. Real-time monitoring of N2O in a multipass cell with an optical path length of 36 m at a concentration level of 1 ppm was demonstrated.

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Correspondence to S. Yamaguchi.

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PACS

42.62.Fi; 42.72.Ai; 07.57.Hm

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Takahashi, M., Ohara, S., Tezuka, T. et al. Trace gas monitor based on difference frequency generation at 4 μm using mass-production laser diodes as pump and signal light sources. Appl Phys B 78, 229–233 (2004). https://doi.org/10.1007/s00340-003-1336-y

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  • DOI: https://doi.org/10.1007/s00340-003-1336-y

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