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).
© 2012 Chinese Optics Letters
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