Improved output beam quality using hyperbolically flared semiconductor laser amplifier
Journal
Proceedings of SPIE - The International Society for Optical Engineering
Journal Volume
3419
Pages
382-387
Date Issued
1998
Author(s)
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.
SDGs
Type
conference paper