Improved output beam quality using a hyperbolically flared semiconductor laser amplifier

Ching-Fuh Lin; Yu-Chia Chang; Jie-Wei Lai

doi:10.1117/12.311032

22 June 1998 Improved output beam quality using a hyperbolically flared semiconductor laser amplifier

Ching-Fuh Lin, Yu-Chia Chang, Jie-Wei Lai

Proceedings Volume 3419, Optoelectronic Materials and Devices; 34191A (1998) https://doi.org/10.1117/12.311032
Event: Asia Pacific Symposium on Optoelectronics '98, 1998, Taipei, Taiwan

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.

Citation Download Citation

Ching-Fuh Lin, Yu-Chia Chang, and Jie-Wei Lai "Improved output beam quality using a hyperbolically flared semiconductor laser amplifier", Proc. SPIE 3419, Optoelectronic Materials and Devices, 34191A (22 June 1998); https://doi.org/10.1117/12.311032

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