8 September 1998 Mid-infrared multiwavelength source for lidar applications
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Abstract
Differential absorption lidars (DIAL) in the mid-infrared (2 - 5 micrometers ) are used to monitor various chemical species. Two wavelengths are required to perform the differential absorption measurement: an `on' line and an `off' line. Previously, the measurement has been made by sequentially tuning between the two lines. However, this can produce errors in the measured differential absorption, especially when a DIAL is used in a `look down' reflector mode from a high speed aircraft, because of variations in the Earth's reflectivity between laser pulses. To avoid this problem and to construct a high speed DIAL system, LaSen, Inc. has developed an intra-cavity `stacked' optical parametric oscillator/laser (OPOL), which is capable of producing simultaneous tunable outputs in the 2 - 5 micrometers region. This laser system utilizes a compact diode pumping scheme and an overlapped laser/OPO resonator design that produces multiple wavelength outputs and minimizes the number of optical components and optical path length. The decreased size of the OPOL system and increased ruggedness makes it ideal for man-portable and airborne operation.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Allen R. Geiger, Egor V. Degtiarev, William H. Farr, Richard D. Richmond, "Mid-infrared multiwavelength source for lidar applications", Proc. SPIE 3380, Laser Radar Technology and Applications III, (8 September 1998); doi: 10.1117/12.327180; https://doi.org/10.1117/12.327180
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