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High speed scanning of terahertz pulse by a rotary optical delay line
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic of the RODL reflector with six reflecting blades. In this illustration, reflector 1 is used as a reflecting blade, where is the rotating angle of the RODL and is the inner radius of the reflecting blade. The laser beam is indicated by the red arrow.

Image of FIG. 2.
FIG. 2.

Experimental setup for the generation of pulsed terahertz wave with a linear stage ODL and a RODL. The insert shows the photographs of the fast scanning RODL with six reflecting blades.

Image of FIG. 3.
FIG. 3.

Comparison of the terahertz spectra measured by the linear stage and the RODL in slow (2 Hz) and fast (50 Hz) scan operation modes. The positions of the absorption peaks of the water vapor coincide well between the two delay lines.

Image of FIG. 4.
FIG. 4.

Trains of the terahertz wave pulses measured by the RODL as a function of time when the scan repetition rate is changed from 50 to 400 Hz.

Image of FIG. 5.
FIG. 5.

SNR for terahertz pulses as a function of the scan repetition rate of the fast RODL. The insert shows variation in SNR for single scan waveform.


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Scitation: High speed scanning of terahertz pulse by a rotary optical delay line