Open AccessBeam quality improvement of laser diode array by using off-axis external cavity
Author(s) -
Zhouping Su,
Qihong Lou,
Junhang Dong,
Jun Zhou,
Runrong Wei
Publication year - 2007
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.15.011776
Subject(s) - optics , laser beam quality , materials science , laser , aperture (computer memory) , beam (structure) , optical axis , laser diode , beam parameter product , m squared , diode , vertical cavity surface emitting laser , spatial filter , semiconductor laser theory , laser beams , optoelectronics , physics , lens (geology) , acoustics
A novel off-axis external cavity is designed for laser diode array to improve the beam quality. In this external cavity, a circle aperture with variable size is used as a spatial filter. The diameter of aperture is optimized to 1.2mm and the off-axis angle of external cavity is optimized at 2.6 deg. In the optimal case, the beam parameter product (BPP) of laser diode array is reduced to 121 mm.mrad from 1050 mm.mrad with external cavity optical efficiency of 81%.