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Experimental setup for the spatially resolved temperature measurement in the active area of the VECSEL device.
Output-power-density of the VECSEL for two different widths of the pump spot. The inset shows the spectral profile of the laser emission for the spot and a pump power density of .
Temperature distribution in the active region of the VECSEL chip for a (a) super-Gaussian and (b) Gaussian pump spots. Corresponding profiles are shown by the gray areas. The solid lines represent super-Gaussian fits with . The FWHM of the pumped area is and the pump power is set to 60 W. (c) Input-output characteristics of the laser are plotted for the super-Gaussian and Gaussian profiles by circles and triangles, respectively.
Temperature distribution in the active region for the pump spots with the FWHM of (a) and (c) at intermediate (full circles) and high (empty circles) pump densities; corresponding simulation results are plotted in (b) and (d), respectively. The numbers give the respective temperature drop across the FWHM of the pump profiles, shown as gray-shaded areas.
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