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Optical and Quantum Electronics

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01-05-2024

Stability improvement of high-power semiconductor laser diode regulators used in infrared solid-state laser applications

Authors: Mihnea-Antoniu Covaci, Ramona Voichița Gălătuș, Lorant Andras Szolga

Published in: Optical and Quantum Electronics | Issue 5/2024

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Abstract

Recent optoelectronics domain studies concluded the increased need to provide improved, stable, and efficient designs to operate high-power NIR (Near-infrared) laser diodes. The existing current regulators provide either stability or high efficiency, with the actual studied design representing a solution providing both advantages in a complex constant current driver. Therefore, this study covers the LTI (Linear Time-Invariant) analysis of a cascade feedback loop current regulator, aiming to achieve a constant current through a high transconductance load. Furthermore, this analysis also refers to such transconductance loads as NIR laser diode bars, having their emission spectrum closely matching one major absorption band of Nd:YAG (Neodymium-dopped Yttrium Aluminum Garnet) solid-state lasers, potentially providing an increased-stability solution to high power, continuous wave side-pumped applications, as well as various DPSS (Diode-Pumped Solid-State) laser prototypes. This design is a suitable solution for an infinite transconductance load, allowing the indefinite power increase in either direct diode or pumped laser applications while maintaining adequate stability. However, as it will be covered, multiple constraints occur for this hardware design.

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Title: Stability improvement of high-power semiconductor laser diode regulators used in infrared solid-state laser applications
Authors: Mihnea-Antoniu Covaci
Ramona Voichița Gălătuș
Lorant Andras Szolga
Publication date: 01-05-2024
Publisher: Springer US
Published in: Optical and Quantum Electronics / Issue 5/2024
Print ISSN: 0306-8919
Electronic ISSN: 1572-817X
DOI: https://doi.org/10.1007/s11082-024-06457-w

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