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A coherent all-solid-state laser array using the Talbot effect in a three-mirror cavity

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5 Author(s)
Yuko Kono ; Dept. of Electr. Eng., Keio Univ., Kanagawa, Japan ; M. Takeoka ; K. Uto ; A. Uchida
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Lateral mode coupling in a diode-pumped Nd:YAG microchip laser array is demonstrated with a Talbot cavity for the first time. The relatively low laser gains of solid-state lasers compared with diode lasers and CO/sub 2/ lasers, to which the Talbot cavity has already been applied successfully, are solved by employing a novel auxiliary Talbot cavity configuration. A brighter twin-peak far-field pattern indicating an out-of-phase array mode, whose spot is 9.3 times smaller than that obtained by incoherent superposition of the individual microchip laser outputs, is obtained from the phase-locked microchip laser array with a mode-selecting slit. Without the mode-selecting slit, a far-field pattern with a single narrow peak is obtained, showing that the array is locked in an in-phase mode, presumably because of multiple reflections in the auxiliary Talbot cavity.

Published in:

IEEE Journal of Quantum Electronics  (Volume:36 ,  Issue: 5 )