Intensity detection of terahertz quantum cascade laser radiation using electro-optic sampling

Rungsawang, R.; Marshall, O.; Freeman, J. R.; Beere, H. E.; Malik, S.; Alton, J.; Barbieri, S.; Ritchie, D. A.
November 2008
Applied Physics Letters;11/10/2008, Vol. 93 Issue 19, p191111
Academic Journal
We demonstrate intensity detection of terahertz radiation from a 2 THz quantum cascade laser with nonsynchronized electro-optic (EO) sampling under crossed polarizers. The detection sensitivity is limited by the residual birefringence of the EO detection crystal. With 100 fs fiber laser pulses and a CdTe EO crystal, terahertz radiation with power less than 100 μW was detected. A femtosecond gating pulse provides an ultrashort detection response that is potentially very useful for analyzing temporal performance of short pulsed radiation or observing fast phenomena probed by terahertz pulses.


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