Abstract-Shot noise reduced terahertz detection via spectrally postfiltered electro-optic sampling

http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-39-8-2435 Michael Porer, Jean-Michel Ménard, and Rupert Huber  »View Author Affiliations

Optics Letters, Vol. 39, Issue 8, pp. 2435-2438 (2014)
http://dx.doi.org/10.1364/OL.39.002435

In ultrabroadband terahertz electro-optic sampling (EOS), spectral filtering of the gate pulse can strongly reduce the quantum noise while the signal level is only weakly affected. The concept is tested for phase-matched electro-optic detection of field transients centered at 45 THz with 12 fs near-infrared gate pulses in AgGaS2. Our new approach increases the experimental signal-to-noise ratio by a factor of 3 compared to standard EOS. Under certain conditions an improvement factor larger than 5 is predicted by our theoretical analysis.

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