Coherent beam combination of broad-area laser diode array using off-axis external cavity with double feedback |
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| Authors: | Zhouping Su Zhicheng Ji Lizhi Que and Zhuowei Zhu |
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| Institution: | 1 School of Science, Jiangnan University, Wuxi 214122, China 2 School of Internet of Things Engineering, Jiangnan University, Wuxi 214122, China |
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| Abstract: | In this letter, we demonstrate coherent beam combination of laser diode array using the external Talbot cavity with double feedback. The double feedback elements consist of grating and high-reflection plane mirror. Compared with single high-reflection plane mirror feedback, the external Talbot cavity with double feedback reduce the number of interference strips in the far-field pattern and narrow spectral line-width of the laser diode array. The results indicate that the application of the external Talbot cavity with double feedback produces a clear far-field interference pattern. In addition, line-width is reduced to 0.15 nm full-width at half-maximum (FWHM). |
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