title: Linewidth reduction in a large-smile laser diode array.
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.
authors.affiliation: Centre for Biophotonics and Laser Science, University of Queensland, Queensland 4072, Australia. talbot@physics.uq.edu.au
authors.forename: C L
authors.initials: CL
authors.lastname: Talbot
authors.forename: M E J
authors.initials: ME
authors.lastname: Friese
authors.forename: D
authors.initials: D
authors.lastname: Wang
authors.forename: I
authors.initials: I
authors.lastname: Brereton
authors.forename: N R
authors.initials: NR
authors.lastname: Heckenberg
authors.forename: H
authors.initials: H
authors.lastname: Rubinsztein-Dunlop