Abstract
High brightness laser diodes in the near infrared are devices of growing interest. Although broad area lasers offer high output power, their lateral beam quality suffers from filamentation and multi-mode operation. One key to a good beam quality is therefore lateral mode control which can be realized internally or externally. One possibility is the application of an external V-shaped unstable resonator which utilizes the double lobed far-field distribution of a gain-guided array amplifier structure [1]. One lobe is fed back into the amplifier to stabilise a single lateral array mode, resulting in a high lateral beam quality. The feedback is done by a grating for additional frequency stabilisation and line width narrowing.
© 2009 IEEE
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