Open AccessDual-axis beam correction for an array of single-mode diode laser emitters using a laser-written custom phase-plate
Author(s) -
Natalia Trela,
H. J. Baker,
Jozef Wendland,
D. R. Hall
Publication year - 2009
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.17.023576
Subject(s) - optics , collimated light , laser , lens (geology) , focal length , optical axis , materials science , laser diode , laser beam quality , beam (structure) , physics , laser beams
A single optical component for a diode laser bar combines fast-axis smile and lens error correction with slow-axis collimation. Produced by laser-machining/polishing, it provides 0.9 mm focal length, 200 microm pitch slow-axis collimation on the same surface that corrects fast-axis errors. Custom fabrication enables fill-factor optimization for the 49 single-mode beams and gives parallel collimation with rms pointing errors of 3% and 6% of the far-field divergence for the fast- and slow-axis array respectively. Sub-micron pitch mismatch between the slow-axis lens and emitter arrays, and beam pointing changes by thermal expansion of the laser bar are detected.