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Proceedings Paper

Improved output beam quality using a hyperbolically flared semiconductor laser amplifier
Author(s): Ching-Fuh Lin; Yu-Chia Chang; Jie-Wei Lai
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Paper Abstract

Filament formation is widely observed in semiconductor laser amplifiers (SLAs). In this work, we propose a new flared structure that could significantly eliminate the filaments.Conventional tapered amplifiers consist of a linearly tailored gain region that serves as the spherical expansion of wave front, which is not ideal due to the diffraction of the nonzero beam size. The proposed hyperbolically flared structure analogizes the expansion of a Gaussian beam and therefore is better for the beam expansion. We use a theoretical model to analyze the beam amplification. This model takes into account the phenomena involved in rate equation, optically induced refractive- index change, paraxial beam propagation. Improved output beam profiles are obtained for the hyperbolically flared SLAs.

Paper Details

Date Published: 22 June 1998
PDF: 0 pages
Proc. SPIE 3419, Optoelectronic Materials and Devices, 34191A (22 June 1998); doi: 10.1117/12.311032
Show Author Affiliations
Ching-Fuh Lin, National Taiwan Univ. (Taiwan)
Yu-Chia Chang, National Taiwan Univ. (Taiwan)
Jie-Wei Lai, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 3419:
Optoelectronic Materials and Devices
Marek Osinski; Yan-Kuin Su, Editor(s)

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