Spatial Mode Filters for Control of Lateral Modes in High Power Semiconductor Lasers
Swint, Reuel Bennett
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https://hdl.handle.net/2142/80804
Description
Title
Spatial Mode Filters for Control of Lateral Modes in High Power Semiconductor Lasers
Author(s)
Swint, Reuel Bennett
Issue Date
2002
Doctoral Committee Chair(s)
Coleman, James J.
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Language
eng
Abstract
The central thesis of this work is that structures can be integrated into the laser that introduce optical loss to only high-order lateral modes and thus prevent them from lasing and degrading the beam quality. Several concepts for modifying the lateral waveguide to create filtering of the lateral modes are examined, including the use of waveguide bend loss, waveguide frustration, and the addition of scattering loss. Each of the concepts tested improves the stability of the beam and prevents the oscillation of high order modes. Stable single lateral mode output power is demonstrated in lasers over the entire range of drive currents tested when frustrating waveguide filters or frustrating scattering waveguide filters are incorporated into the devices. This improves the single lateral mode power output from 500 mW to 800 mW.
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