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Dielectric coatings for optimized low-loss saturable absorbers for high-power ultrafast laser

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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.

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收稿日期:2009-04-13

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网络出版日期:0001-01-01

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张靓:Department of Physics, Changchun University of Science and Technology, Changchun 130022, ChinaDepartment of Physics and Center of Applied Photonics, University of Konstanz, 78457 Konstanz, Germany
Farina K?nig:Department of Physics and Center of Applied Photonics, University of Konstanz, 78457 Konstanz, Germany
Joerg Neuhaus:Department of Physics and Center of Applied Photonics, University of Konstanz, 78457 Konstanz, Germany
Dominik Bauer:Department of Physics and Center of Applied Photonics, University of Konstanz, 78457 Konstanz, Germany
Thomas Dekorsy:Department of Physics and Center of Applied Photonics, University of Konstanz, 78457 Konstanz, Germany
陈亚符:Department of Physics, Changchun University of Science and Technology, Changchun 130022, China

备注:This work was supported by the Ministry of Science, Research and Arts of Baden-W¨urttemberg State of Germany and the Chinese Scholarship Council.

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引用该论文

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," Chinese Optics Letters 7(9), 819-822 (2009)

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