Flat-topped beam output from a double-clad rectangular dielectric waveguide laser with a high-index inner cladding |
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| Authors: | Hongxiang Kang Haitao Zhang Dongsheng Wang |
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| Institution: | a Center for Photonics and Electronics, State Key Laboratory of Tribology, Department of Precision Instruments, Tsinghua University, Chengfu Road 28#, Haidian, Beijing 100084, China
b Institute of Radiation Medicine, Academy of Military Medical Sciences, Beijing 100850, China |
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| Abstract: | A novel method to produce a flat-topped laser beam by using a double-clad rectangular waveguide laser with high-index inner cladding is presented. The waveguide dispersion equation for cosine mode was deduced, the condition for the flattened mode was given out, relative gains for guided modes were calculated numerically and analyzed. Results indicate that a gain advantage for the flattened mode is clear, a flat-topped laser beam can be achieved when the optical confinement factor, the gain intensity and the output coupler are chosen suitably. |
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| Keywords: | 42 55 Rz 42 60 Jf 42 79 Gn 42 82 Et |
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