Abstract
Fundamental-spatial mode diode lasers with an output power in the 1-W range are of interest for a variety of applications, including free-space optical communications and pumping of rare-earth doped single-mode fibres. This requires in particular a lateral waveguide that is narrow and defined by a small effective index step Aneff in order to cutoff the propagation of higher order modes. The narrow contact width of the device inherently limits the output power because of the small light-emitting area and the high optical intensity, which induces catastrophic optical damage. Furthermore, at high output powers carrier-induced index suppression, thermal lensing and spatial hole burning cause the appearance of higher order modes in the lasing emission. In order to stabilize the fundamental mode, lossy elements increasing the threshold of higher order modes have to be introduced into the waveguide.
© 2007 IEEE
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