(Color online) Scheme of the V-TR configuration of the thermoreflectance experimental setup. The VECSEL chip clamped into a copper sample holder is mounted on the temperature stabilized heatsink, placed together with the pump optics and the external cavity on the motorized x-y-z stages.
(Color online) Maximal temperature increases for optical pumping VECSEL chips without a heatspreader (HS) and with SiC and diamond heatspreaders.
(Color online) (a) The temperature increases calculated assuming reflection from the sample’s surface (circles) and reflection and emission (triangles). For comparison, the results calculated without consideration ofthese processes are also included (inverted triangles). (b) Graphical representation of the heat balance of the optically pumped VECSEL.
(Color online) (a) Temperature distribution map for operating VECSEL without SiC heatspreader. (b) Comparison of radial temperature profiles for lasing and non-lasing device (right). tpulse = 0.5 ms, duty cycle = 25%, incident pump power = 3.6 W.
(Color online) (a) Temperature distribution map for operating VECSEL with SiC heatspreader. (b) Comparison of radial temperature profiles for lasing and non-lasing device. tpulse = 0.5 ms, duty cycle = 25% , incident pump power = 3.6 W.
(Color online) (a) Comparison of maximal temperature increases for operating and non-operating VECSEL without a heatspreader (circles) and for VECSEL with A SiC heatspreader (squares). In both cases black corresponds to non-lasing device. (b) Difference in the maximal temperature increases between lasing and non-lasing devices.
(Color online) Power conversion curve and registered temperature difference (ΔT = ΔToff − ΔTon) for a given pump power.
Thermal conductivities and layer thicknesses used in the simulations.
Summary of experimental and numerical results for VECSEL chips without and with a SiC heatspreader (HS).
Comparison of maximum temperature increases and FWHM of temperature profiles for VECSELs with and without an intracavity heatspreader (HS). FWHM_H and FWHM_V stand for horizontal and vertical profiles, and the observed asymmetry of their values is the result of pumping devices at an angle.
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