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Proceedings Paper

Test results of a diffraction grating beam combiner
Author(s): Jonathan A. R. Rall; Paul L. Spadin; Robert K. Zimmerman Jr.; William L. Maynard
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Paper Abstract

A laser diode beam combiner employing diffraction gratings has been fabricated and tested. The Grating Laser Beam Combiner (GLBC) uses two holographic diffraction gratings to incoherently combine the first order diffraction components of four 35 mW AlGaAs lasers. The grating rhomb design minimizes the transmitter sensitivity to the inherent frequency instability of laser diodes. The overall throughput of the combiner is 74 percent. Each laser was temperature controlled to 0.1 C and modulated with 110 Mbps QPPM data. Two lasers under modulation were coaligned to within 76 microrad with a combined average power of 45 mW.

Paper Details

Date Published: 1 July 1990
PDF: 12 pages
Proc. SPIE 1218, Free-Space Laser Communication Technologies II, (1 July 1990); doi: 10.1117/12.18194
Show Author Affiliations
Jonathan A. R. Rall, NASA/Goddard Space Flight Ctr. (United States)
Paul L. Spadin, NASA/Goddard Space Flight Ctr. (United States)
Robert K. Zimmerman Jr., NASA/Goddard Space Flight Ctr. (United States)
William L. Maynard, NASA/Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 1218:
Free-Space Laser Communication Technologies II
David L. Begley; Bernard D. Seery, Editor(s)

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