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Proceedings Paper

ICESat-2 laser Nd:YVO4 amplifier
Author(s): Nicholas W. Sawruk; Patrick M. Burns; Ryan E. Edwards; Viatcheslav Litvinovitch; Nigel Martin; Greg Witt; Elias Fakhoury; John Iskander; Mark S. Pronko; Elisavet Troupaki; Michael M. Bay; Charles C. He; Liqin L. Wang; John F. Cavanaugh; Babak Farrokh; Jonathan A. Salem; Eric Baker
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Paper Abstract

We report on the cause and corrective actions of three amplifier crystal fractures in the space-qualified laser systems used in NASA Goddard Space Flight Center’s (GSFC) Ice, Cloud, and Land Elevation Satellite-2 (ICESat-2). The ICESat-2 lasers each contain three end-pumped Nd:YVOO4 amplifier stages. The crystals are clamped between two gold plated copper heat spreaders with an indium foil thermal interface material, and the crystal fractures occurred after multiple years of storage and over a year of operational run-time. The primary contributors are high compressive loading of the NdYVO4 crystals at the beginning of life, a time dependent crystal stress caused by an intermetallic reaction of the gold plating and indium, and slow crack growth resulting in a reduction in crystal strength over time. An updated crystal mounting scheme was designed, analyzed, fabricated and tested. Thee fracture slab failure analysis, finite-element modeling and corrective actions are presented.

Paper Details

Date Published: 20 February 2018
PDF: 12 pages
Proc. SPIE 10513, Components and Packaging for Laser Systems IV, 105130X (20 February 2018); doi: 10.1117/12.2292256
Show Author Affiliations
Nicholas W. Sawruk, Fibertek, Inc. (United States)
Patrick M. Burns, Fibertek, Inc. (United States)
Ryan E. Edwards, Fibertek, Inc. (United States)
Viatcheslav Litvinovitch, Fibertek, Inc. (United States)
Nigel Martin, Fibertek, Inc. (United States)
Greg Witt, Fibertek, Inc. (United States)
Elias Fakhoury, Fibertek, Inc. (United States)
John Iskander, Fibertek, Inc. (United States)
Mark S. Pronko, Fibertek, Inc. (United States)
Elisavet Troupaki, NASA Goddard Space Flight Ctr. (United States)
Michael M. Bay, NASA Goddard Space Flight Ctr. (United States)
Charles C. He, NASA Goddard Space Flight Ctr. (United States)
Liqin L. Wang, NASA Goddard Space Flight Ctr. (United States)
John F. Cavanaugh, NASA Goddard Space Flight Ctr. (United States)
Babak Farrokh, NASA Goddard Space Flight Ctr. (United States)
Jonathan A. Salem, NASA Glenn Research Ctr. (United States)
Eric Baker, NASA Glenn Research Ctr. (United States)

Published in SPIE Proceedings Vol. 10513:
Components and Packaging for Laser Systems IV
Alexei L. Glebov; Paul O. Leisher, Editor(s)

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