Chinese Optics Letters, 2009, 7 (9): 819, Published Online: Sep. 22, 2009
Dielectric coatings for optimized low-loss saturable absorbers for high-power ultrafast laser 
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半导体可饱和吸收反射镜 (SESAM) 电场分布 介质反射层 140.7090 Ultrafast lasers 140.4050 Mode-locked lasers 320.7080 Ultrafast devices
Abstract
With the development of high power ultrafast laser passively mode-locked by a semiconductor saturable absorber mirror (SESAM), the damage threshold and degeneration mechanism of the SESAM become more and more important. One way to reduce the maximum electric field inside the active part of the SESAM is the use of a dielectric coating on the top of the semiconductor structure. With Fresnel formula, optical transfer matrix, and optical thin film theory, the electric field distribution and reflectance spectrum can be simulated. We introduce the design principles of SESAM including the dependence of reflectance spectrum on dielectric function of absorber, and investigate the dependences of the electric field distribution, modulation depth, reflectance spectrum, and the relative value of incident light power at the top quantum well of SESAM on the number of SiO<sub>2</sub>/Ta<sub>2</sub>O<sub>5</sub> layers.
Liang Zhang, Farina K?nig, Joerg Neuhaus, Dominik Bauer, Thomas Dekorsy, Yafu Chen. Dielectric coatings for optimized low-loss saturable absorbers for high-power ultrafast laser[J]. Chinese Optics Letters, 2009, 7(9): 819.
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