22 March 2013 The Lunar Laser OCTL Terminal (LLOT) optical systems
Author Affiliations +
Abstract
The Lunar Laser OCTL Terminal is an auxiliary ground station terminal for the Lunar Laser Communication Demonstration (LLCD). The LLOT optical systems exercise modulation and beam divergence control over six 10-W fiber-based laser transmitters at 1568 nm, which act as beacons for pointing of the space-based terminal. The LLOT design transmits these beams from distinct sub-apertures of the F/76 OCTL telescope at divergences ranging from 110 μrad to 40 μrad. LLOT also uses the same telescope aperture to receive the downlink signal at 1550 nm from the spacecraft terminal. Characteristics and control of the beacon lasers, methods of establishing and maintaining beam alignment, beam zoom system design, co-registration of the transmitted beams and the receive field of view, transmit/receive isolation, and downlink signal manipulation and control are discussed.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
W. Thomas Roberts, W. Thomas Roberts, Malcolm W. Wright, Malcolm W. Wright, } "The Lunar Laser OCTL Terminal (LLOT) optical systems", Proc. SPIE 8610, Free-Space Laser Communication and Atmospheric Propagation XXV, 86100P (22 March 2013); doi: 10.1117/12.2004415; https://doi.org/10.1117/12.2004415
PROCEEDINGS
9 PAGES


SHARE
RELATED CONTENT

Improved Stratospheric And Mesospheric Sounder
Proceedings of SPIE (September 18 1987)
Solar viewing interferometer prototype
Proceedings of SPIE (October 12 2004)
Active Pupil Geometry Control Of A Phased Array Telescope
Proceedings of SPIE (September 20 1989)
Some Design Aspects Of A Multiple-Mirror Telescope
Proceedings of SPIE (September 01 1972)
The Infra-Red Optical System Of ISAMS
Proceedings of SPIE (October 03 1988)

Back to Top