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Up-conversion of long, 3-50-μs, pulses imitating input signals of CO2 laser differential absorption lidars was investigated experimentally. Efficiency of 1 to 2% has been acheived when using 1.06-μm Nd:YAG pump emission and 3.9 mm ZnGeP2 crystal that is characterized by absorption coefficient equal to 2.0 cm-1 at this wavelength and 2.5cm-1 at up-converted 0.9548 μm one. When using a silicon avalanche photodiode operating in photon counting mode operation, 450 times increase in signal-to-noise ration can be realized in comparison with dirct detection of the CO2 laser lidar signals by MCT photodiode.© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only. |
