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Proceedings Paper

Design Of A Complete Laser Diode Transmitter Package For Space Communications.
Author(s): Martin D. Roberts; Ray Ogden
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Paper Abstract

A Laser Diode Transmitter Package [LDTP] has been designed to collimate,align and shape the beam from a semi-conductor laser with the following optical beam characteristics: a far-field beam divergence [to the 1/e2 intensity points] of ± 30°, a beam aspect ratio of 3:1, astigmatism varying from 6-10um and wavelength range of 1500-1550nm. The optical package consists of a collimator, null lens, beam anamorphosers and alignment wedges. The optical collimator is based upon a simple Kingslake-type configuration. A detailed study of the collimator has been undertaken analysing the variation of RMS WFE performance with field angle, focal shift, and astigmatism.In addition the manufacturing tolerances have been predicted based upon a maximum allowed RMS wavefront error of X/20. Finally a package integration study has been undertaken which is largely concerned with the integration of the Laser diode block and the collimating lens. This includes an analysis of assembly technique with regard to achieving the extremely tight positioning tolerances required to achieve a X/20 RMS WFE performance.Considerations are also given to the problems of thermal stability, hermeticity, and the effect of ambient to vacuum pressure changes.

Paper Details

Date Published: 1 April 1990
PDF: 8 pages
Proc. SPIE 1191, Optical Systems for Space and Defence, (1 April 1990); doi: 10.1117/12.969706
Show Author Affiliations
Martin D. Roberts, Pilkington Optronics (United Kingdom)
Ray Ogden, Plessey Research Caswell (United Kingdom)

Published in SPIE Proceedings Vol. 1191:
Optical Systems for Space and Defence
Alan H. Lettington, Editor(s)

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