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Fast scanning of a pulsed terahertz signal using an oscillating optical delay line
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10.1063/1.2437764
/content/aip/journal/rsi/78/2/10.1063/1.2437764
http://aip.metastore.ingenta.com/content/aip/journal/rsi/78/2/10.1063/1.2437764
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Experimental setup for the fast measurement of a pulsed terahertz signal generated by a femtosecond laser and a photoconductive antenna using an oscillating optical delay line.

Image of FIG. 2.
FIG. 2.

Schematics for a measurement system of a pulsed terahertz signal (a) for the slow scan mode using a stepper motor optical delay line and a lock-in amplifier and (b) for the fast scan mode using an oscillating optical delay line and a preamplifier.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Voltage signal measured by using a preamplifier and DAQ board as a function of number of data, (b) a conceptual diagram of the sinusoidal motion of the retroreflector in the oscillating optical delay line, and (c) the corresponding displacement of the retroreflector as a function of time. The thick arrows indicate the moving direction of the retroreflector.

Image of FIG. 4.
FIG. 4.

Variation of the terahertz signals measured in the two periods of the retroreflector in the oscillating optical delay line (right) and the corresponding position of the retroreflector in the oscillating optical delay line (left).

Image of FIG. 5.
FIG. 5.

Comparison of the (a) temporal waveform and (b) frequency spectrum of the pulsed terahertz signal between the slow scan mode and the fast scan mode. The oscillation frequency and amplitude of the retroreflector are and , respectively.

Image of FIG. 6.
FIG. 6.

Measured pulsed terahertz signal with different oscillation frequency of the retroreflector (a) before the calibration and (b) after the calibration using the delay time considering the sinusoidal oscillating motion of the retroreflector in the oscillating optical delay line.

Image of FIG. 7.
FIG. 7.

Measured pulsed terahertz signal with different amplitude of the oscillation of the retroreflector (a) before the calibration and (b) after the calibration using the delay time considering the sinusoidal oscillating motion of the retroreflector in the oscillating optical delay line.

Image of FIG. 8.
FIG. 8.

Signal to noise ratio as a function of averaging numbers on the measured terahertz pulses in the fast scan mode.

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/content/aip/journal/rsi/78/2/10.1063/1.2437764
2007-02-05
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Fast scanning of a pulsed terahertz signal using an oscillating optical delay line
http://aip.metastore.ingenta.com/content/aip/journal/rsi/78/2/10.1063/1.2437764
10.1063/1.2437764
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