13 February 2001 Widely tunable 2-μm cw local/master oscillator lasers for wind and DIAL measurements
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Abstract
Advances in coherent lidar using eyesafe solid state lasers in recent years have driven the development of increasingly compact, high performance single frequency CW lasers for use as master oscillator and local oscillator sources. In addition to highly stable single-frequency operation for coherent detection, many applications require agile frequency tuning capability. Examples include space-based coherent lidar where the local oscillator must be tunable in order to compensate for the fast platform motion. For a 45 degree conical scan about nadir the 7.5 km/s platform velocity introduces a ± 5.3 GHz Doppler shift. We have recently developed a Tm;Ho:YLF master oscillator producing over 50mW of single frequency power that can quickly tune over 25 GHz in frequency using a PZT. Over 50 GHz of continuous mode-hop-free single frequency tuning has been demonstrated by temperature tuning. In this paper we review the status of master/local oscillator work at CTI. We also describe the application of this 2.05 ?m laser to column content measurements of atmospheric CO2 and water vapor using a direct detection colunm content DIAL technique.
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Sammy W. Henderson, Charley P. Hale, John W. Hobbs, Philip Gatt, James R. Magee, "Widely tunable 2-μm cw local/master oscillator lasers for wind and DIAL measurements", Proc. SPIE 4153, Lidar Remote Sensing for Industry and Environment Monitoring, (13 February 2001); doi: 10.1117/12.417033; https://doi.org/10.1117/12.417033
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