4 April 1997 Single-mode frequency-agile 9-11 um CO2 laser local oscillator
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A cw carbon-dioxide laser capable of being switched at a 30- Hz rate to different laser lines in the 9 - 11 micrometer spectral region has been developed as a single mode local oscillator for high-detection-sensitivity coherent lidar applications. Over sixty 12C16O2 laser lines (fifty lines for a 13C16O2 laser) with output power varying from 0.5 W to 5 W were obtained using a compact galvanometer controlled scanning mirror/fixed grating configuration; with a specially designed galvanometer-input voltage waveform digitially controlled through a 16-bit D/A converter, the laser frequency fluctuation was found using a heterodyne technique to have settled to about 0.3 MHz peak-to-peak in 25 ms following each line switching, which is adequate for our coherent lidar atmospheric sensing applications.
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Richard S. Eng, Richard S. Eng, James F. Cunningham, James F. Cunningham, Yu-Lin Wang, Yu-Lin Wang, Victor H. Hasson, Victor H. Hasson, "Single-mode frequency-agile 9-11 um CO2 laser local oscillator", Proc. SPIE 2987, Gas and Chemical Lasers and Applications II, (4 April 1997); doi: 10.1117/12.271573; https://doi.org/10.1117/12.271573

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