Abstract.
A tunable mid-infrared continuous-wave (cw) spectroscopic source in the 3.4–4.5 μm region is reported, based on difference frequency generation (DFG) in a quasi-phase-matched periodically poled RbTiOAsO4 (PPRTA) crystal, DFG power levels of 10 μW were generated at approximately 4 μm in a 20-mm long PPRTA crystal by mixing two cw single-frequency Ti:Al2O3 lasers operating near 713 nm and 871 nm, respectively, using a laser pump power of 300 mW. A quasi-phase-matched infrared wavelength-tuning bandwidth (FWHM) of ∼12 cm-1 and a temperature tuning rate of 1.02 cm-1/°C were achieved. Experimental details regarding the feasibility of trace gas detection based on absorption spectroscopy of CO2 in ambient air using this DFG radiation source are also described.
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Received: 23 October 2000 / Revised version: 22 January 2001 / Published online: 27 April 2001
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Chen, W., Mouret, G., Boucher, D. et al. Mid-infrared trace gas detection using continuous-wave difference frequency generation in periodically poled RbTiOAsO4. Appl Phys B 72, 873–876 (2001). https://doi.org/10.1007/s003400100561
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DOI: https://doi.org/10.1007/s003400100561