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Published on: March 31, 2016
Linewidth reduction in a large-smile laser diode array
C L Talbot1, M E J Friese, D Wang
1Centre for Biophotonics and Laser Science, University of Queensland, Queensland 4072, Australia. talbot@physics.uq.edu.au
Abstract:
We present theory and simulations for a spectral narrowing scheme for laser diode arrays (LDAs) that employs optical feedback from a diffraction grating. We calculate the effect of the so-called smile of the LDA and show that it is possible to reduce the effect by using a cylindrical lens set at an angle to the beam. The scheme is implemented on a 19-element LDA with smile of 7.6 microm and yields frequency narrowing from a free-running width of 2 to 0.15 nm. The experimental results are in good agreement with the theory.
