Open AccessHigh beam quality in two directions and high efficiency output of a diode laser array by spectral-beam-combining
Author(s) -
Zhihong Zhu,
Gou Long,
Menghua Jiang,
Hui Yang,
Hong Lei,
Qiang Li
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.017804
Subject(s) - optics , laser beam quality , m squared , beam parameter product , beam divergence , beam (structure) , beam expander , beam diameter , laser , materials science , diode , semiconductor laser theory , physics , optoelectronics , laser beams
Improvement is made in the traditional spectral beam combining structure by adding beam shaping element, namely Beam Transformation System (BTS). Spectral beam combination is performed in a horizontal direction by the external cavity after beam shaping. The effect of smile and the divergence of the slow axis are reduced. A standard semiconductor laser array is used in this experiment. A CW output power of 58.8 W and an electro-optic conversion efficiency of 51% are achieved. The spectral line-width is 12.7 nm. M(2) of 1.3 × 11.6 in horizontal and vertical directions are obtained. The beam quality of the output is close to that of a single emitter of the array in two directions.