NDLI: Design and performance of the vegetation canopy Lidar (VCL) laser transmitter

Content Provider	IEEE Xplore Digital Library
Author	Coyle, D.B. Kay, R.B. Lindauer, S.J.
Copyright Year	2002
Description	Author affiliation: NASA Goddard Space Flight Center, Greenbelt, MD, USA (Coyle, D.B.)
Abstract	Design details of the vegetation canopy laser (VCL) for the NASA multi beam laser altimeter (MBLA) earth orbit mission are presented. The laser is a Nd:YAG Q-switched, diode side-pumped, zig-zag slab design producing 10 ns, 15 mJ pulses at 1064 nm. It employs an unstable resonator as well as a graded reflectivity output coupler with a Gaussian reflectivity profile. A cylindrical lens of undoped YAG collimates the 809 nm pump diode radiation and focuses it into a region /spl sim/ 1.5 mm wide down the 100 mm long Nd:YAG slab. In order to conserve power, a conductively cooled design is employed. The laser is designed to operate over a range of 25/spl deg/C without active thermal control. Passive cooling is achieved with a large thermal radiator panel consisting of heat-pipes and a change-of-state element. The laser is equipped with a 15/spl times/ beam expander to limit the output divergence to less than 60 /spl mu/rad. One discussion will explain the compensation of the thermal lens created in the side-pumped slab and the different treatments of the x and y portions of the z-directed beam in order to obtain an output beam of near circular symmetry. Paraxia modeling was used along with performance data to determine the optimum location of the thermal compensating lens, and how the slab's thermal lens changed with temperature. This is due to the change in inversion density resulting from the varying overlap of the pump radiation spectral profile with the location of the Nd:YAG pump bands. Performance data as a function of temperature are given. The total number of shots to date and any change in performance as a function of shot count are presented.
Sponsorship	IEEE Aerosp. & Electron. Syst. Soc
Starting Page	3
Ending Page	3
File Size	749869
Page Count	1
File Format	PDF
ISBN	078037231X
DOI	10.1109/AERO.2002.1035282
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-03-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical design Vegetation Laser radar Transmitters Slabs Lenses Laser beams Thermal lensing Pump lasers Diodes
Content Type	Text
Resource Type	Article

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