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Influence of the spatial pump distribution on the performance of high power vertical-external-cavity surface-emitting lasers

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13 Author(s)
Chernikov, A. ; Department of Physics and Materials Sciences Center, Philipps Universität Marburg, Renthof 5, D-35032 Marburg, Germany ; Herrmann, J. ; Scheller, M. ; Koch, M.
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The performance of a 1040 nm vertical-external-cavity surface-emitting laser is studied as function of the size and shape of the pumped area. The input-output characteristics of the device are monitored while simultaneously tracking the temperature in the active region. It is shown that the pump spot shape plays a crucial role in optimizing the laser output. Improvements up to a factor of 5 are found for a super-Gaussian in comparison to the standard Gaussian shape. For the large pump-spot sizes needed for high output powers, it turns out that the power-scalability breaks down due to the suppressed lateral heat flow.

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Applied Physics Letters  (Volume:97 ,  Issue: 19 )