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Thermo-optic detection of terahertz radiation from a quantum cascade laser

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6 Author(s)
van Kolck, A. ; Institute for Quantum Electronics, ETH Zürich, Wolfgang-Pauli-Strasse 16, 8093 Zürich, Switzerland ; Amanti, M. ; Fischer, M. ; Beck, M.
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We investigate the asynchronous detection of terahertz radiation from a quantum cascade laser using an electro-optic sampling apparatus. The signal does not vary substantially upon rotating the detection crystal, while a characteristic angle dependence is exhibited for synchronized time-domain pulses from a photoconductive emitter. Upon increasing the electrical modulation frequency of the cascade laser the unsynchronized signal decreases in good agreement with a thermal detector. Rather than being electro-optic in origin, we therefore ascribe the unsynchronized signal to a thermo-optic modulation of the refractive index. A simple model is in good agreement with the effect’s frequency dependence.

Published in:

Applied Physics Letters  (Volume:97 ,  Issue: 25 )