Multiple vertical mode high power 975 nm diode lasers restricted to single vertical mode operation through use of optical facet coatings

Published in:
Electron. Lett., vol. 45, no. 1, pp. 51-53 (2009).
© The Institution of Engineering and Technology 2009. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Institution of Engineering and Technology 2009.

Abstract:
A new design approach has been developed for facet coating of high power diode lasers, that is shown to preferentially suppress higherorder guided optical modes, without any degradation in device performance. Repeated optical coating of reference lasers is found to controllably transform the vertical far field from a three-peaked higher-order mode to a single-peaked fundamental mode, in good agreement with simulations. 975 nm devices with such coatings reach power conversion efficiency of 65%.

Full version in pdf-format.