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Coherent detection of terahertz pulses based on two-photon absorption in a photodiode
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental setup for the coherent detection of terahertz pulses (indicated by a shade of gray), generated by optical rectification in a first DAST crystal (Ref. 14). The thin line represents the probe pulse that is focused by the terahertz electric field in the second DAST crystal through terahertz-induced lensing (TIL). The different intensity distribution on the Si diode leads to a change in the two-photon absorption within the Si photodiode that is proportional to the terahertz field. The InGaAs photodiode is used as a reference to correct for pulse energy fluctuations.

Image of FIG. 2.
FIG. 2.

(Color online) Typical terahertz wave form detected by terahertz-induced lensing, read out with two different methods. TPA, signal read out by two-photon absorption in a silicon photodiode as introduced in this letter. Central intensity, read out by measuring the intensity change in the center of the probe beam. Top: Signals in time domain. Bottom: Fourier spectra of the same signals.


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Scitation: Coherent detection of terahertz pulses based on two-photon absorption in a photodiode