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Proceedings Paper

Single Mode Wavelength Control Of Modulated AIGaAs Lasers With External And Internal Etalon Feedback
Author(s): William L. Maynard
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Paper Abstract

Control of the longitudinal mode of a laser diode is necessary in any wavelength dependent beam combining system. External and internal etalons can provide periodic optical feedback to a laser diode which modifies the laser diode gain curve, resulting in improved control of the lasing mode. We have obtained single mode lasing without mode hops for VSIS and CSP laser diodes with an external etalon attached to the laser's front facet for up to an 8°C range CW and a 4°C range pulsed, with .07 nm/°C tuning. Our tests of thin tapered-thickness (TT I) laser diodes show CW and pulsed single mode lasing over 10°C and 2°C ranges, respectively, with .08 nm/°C tuning. An analysis of the TTT structure reveals the equivalent of an internal etalon. The time resolved pulsed behavior for both types of lasers show single mode lasing within the proper temperature ranges with minor modes present only early in the optical pulse, if at all. The external etalon produces noticeable interference fringes in the farfield pattern, while those of the TTT lasers are smooth. Ongoing CW lifctest results indicate stability to within one longitudinal mode after a few hundred hours of operation, along with at least several thousand hours lifetime.

Paper Details

Date Published: 11 July 1989
PDF: 8 pages
Proc. SPIE 1044, Optomechanical Design of Laser Transmitters and Receivers, (11 July 1989); doi: 10.1117/12.951281
Show Author Affiliations
William L. Maynard, NASA/Goddard Space Flight Center (United States)

Published in SPIE Proceedings Vol. 1044:
Optomechanical Design of Laser Transmitters and Receivers
Bernard D. Seery, Editor(s)

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