Modeling of semiconductor saturable absorber mirrors using dynamic mode analysis

Christoph Pflaum; Zhabiz Rahimi

doi:10.1117/12.2004005

22 February 2013 Modeling of semiconductor saturable absorber mirrors using dynamic mode analysis

Christoph Pflaum, Zhabiz Rahimi

Proceedings Volume 8600, Laser Resonators, Microresonators, and Beam Control XV; 86000V (2013) https://doi.org/10.1117/12.2004005
Event: SPIE LASE, 2013, San Francisco, California, United States

Abstract

Semiconductor saturable absorber mirrors (SESAMs) are used to produce passively Q-switched ultrashort pulsed lasers. Numerical modeling of physical effects of SESAM is required to effectively design this type of lasers. For this purpose, simulations are performed to study the dynamic behavior of Gauss modes, gain of modes and saturation of the saturable absorber mirror. The laser beam quality has to be good enough in order to avoid chaotic laser behavior. We extended our dynamic mode analysis (DMA) algorithm to calculate laser beam quality. This simulation technique is based on rate equations for a set of Gauss modes and population inversions. Gain of each mode can be calculated separately by solving the corresponding set of rate equations. We have assumed that the reflectivity of the mirror is spatially invariant in the SESAMs model. An additional rate equation is required to include the saturation of SESAM. This equation considers parameters such as modulation depth, saturation fluence and relaxation time. Simulation results show that our model can predict pulse energy and non-chaotic behavior of the laser.

Citation Download Citation

Christoph Pflaum and Zhabiz Rahimi "Modeling of semiconductor saturable absorber mirrors using dynamic mode analysis", Proc. SPIE 8600, Laser Resonators, Microresonators, and Beam Control XV, 86000V (22 February 2013); https://doi.org/10.1117/12.2004005

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KEYWORDS

Mirrors

Laser crystals

Semiconductors

Crystals

Optical simulations

Thermal effects

Semiconductor lasers

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