Grady J. Koch

TL;DR: A differential absorption lidar has been built to measure CO2 concentration in the atmosphere, using a pulsed single-frequency Ho:Tm:YLF laser at a 2.05-microm wavelength and a coherent heterodyne receiver to achieve sensitive detection.

TL;DR: In this article, a coherent Doppler lidar at 2 m wavelength has been built with higher output energy 100 mJ than previously available, based on diode-pumped Ho:Tm:LuLiF, a recently developed laser material that allows more efficient energy extraction.

TL;DR: A 2 microm wavelength, 90 mJ, 5 Hz pulsed Ho laser is described with wavelength control to precisely tune and lock the wavelength at a desired offset up to 2.9 GHz from the center of a CO(2) absorption line.

TL;DR: The signal-processing aspect of a 2-µm wavelength-coherent Doppler lidar system under development at NASA Langley Research Center in Virginia is investigated and the authenticity of NADSET is established by comparing the trend of wind parameters with and without NADSET applied to the long-period lidar return data.

TL;DR: A single-frequency Ho:Tm:YLF laser, operating at an eye-safe wavelength of 2 mum, has been developed with tuning characteristics optimized for spectroscopy of absorption features, an ideal injection seed source for a differential absorption lidar system for measurement of atmospheric gases.