Open Access Paper
17 November 2017 Optical overview and qualification of the LLCD space terminal
C. E. DeVoe, A. D. Pillsbury, F. Khatri, J. M. Burnside, A. C. Raudenbush, L. J. Petrilli, T. Williams
Author Affiliations +
Proceedings Volume 10563, International Conference on Space Optics — ICSO 2014; 105630F (2017) https://doi.org/10.1117/12.2304194
Event: International Conference on Space Optics — ICSO 2014, 2014, Tenerife, Canary Islands, Spain
Abstract
In October 2013 the Lunar Laser Communications Demonstration (LLCD) made communications history by successfully demonstrating 622 megabits per second laser communication from the moon’s orbit to earth. The LLCD consisted of the Lunar Laser Communication Space Terminal (LLST), developed by MIT Lincoln Laboratory, mounted on NASA’s Lunar Atmosphere and Dust Environment Explorer (LADEE) spacecraft and a primary ground terminal located in New Mexico, the Lunar Laser Communications Ground Terminal (LLGT), and two alternate ground terminals.

This paper presents the optical layout of the LLST, the approach for testing the optical subsystems, and the results of the optical qualification of the LLST. Also described is the optical test set used to qualify the LLST. The architecture philosophy for the optics was to keep a small, simple optical backend that provided excellent boresighting and high isolation between the optical paths, high quality wavefront on axis, with minimal throughput losses on all paths. The front end large optics consisted of a Cassegrain 107mm telescope with an f/0.7 parabolic primary mirror and a solar window to reduce the thermal load on the telescope and to minimize background light received at the sensors.
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
C. E. DeVoe, A. D. Pillsbury, F. Khatri, J. M. Burnside, A. C. Raudenbush, L. J. Petrilli, and T. Williams "Optical overview and qualification of the LLCD space terminal", Proc. SPIE 10563, International Conference on Space Optics — ICSO 2014, 105630F (17 November 2017); https://doi.org/10.1117/12.2304194
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KEYWORDS
Telescopes

Space telescopes

Wavefronts

Near field optics

Optical testing

Sensors

Thermography

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