Concept information
Preferred term
LASE
Definition
- The Lidar Atmospheric Sensing Experiment (LASE) program was initiated as an effort to produce an autonomous system for measuring water vapor levels from airborne and spaceborne platforms using LIDAR technology. The LASE Instrument: The transmitter consists of a Ti:sapphire laser pumped by a double pulsed Nd:YAG laser. The frequency of the Ti:sapphire laser is controlled by injection seeding using a diode laser that is frequency locked to a water vapor line in the 815-nm region. The "on" and "off" wavelengths are separated by less than 70 pm. The laser pulses are sequentially transmitted with about 400 microseconds separation. This permits the use of the same avalanche photodiodes (APD) for detecting the lidar returns. The use of low and high light level APD's provides linear response to atmospheric and cloud/ground returns, respectively. Lidar returns at 5 Hz are digitized and recorded, and when possible, the data are telemetered to the LASE ground station for real-time processing and experiment control. Operation with strong and weak absorption regions of a preselected water vapor line can be made during the mission to optimize the measurement of water vapor in different altitude regions. The LASE system has proven to be a reliable, accurate, and sensitive water vapor profiler with the ability to measure water vapor mixing ratios over a large dynamic range (0.01 g/kg to 20 g/kg). Aerosol backscatter ratios can be measured from ground to 20 km with a vertical resolution of 30 m and a horizontal resolution of 40 m. Additional information available at "http://asd-www.larc.nasa.gov/lase/ASDlase.html" [Summary provided by NASA] (en)
Broader concept
URI
https://gcmd.earthdata.nasa.gov/kms/concept/f53da431-a1cd-4151-9df9-9d82745797d0
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