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
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.2010) Lasers and laser optics : Diode laser arrays
(140.3410) Lasers and laser optics : Laser resonators
(140.3298) Lasers and laser optics : Laser beam combining
Lasers and Laser Optics
Zhouping Su, Zhicheng Ji, Lizhi Que, and Zhuowei Zhu, "Coherent beam combination of broad-area laser diode array using of f-axis external cavity with double feedback," Chin. Opt. Lett. 10, 101402-101402 (2012)