Study of Terahertz Intensity Dependence on Time Resolved Dynamic fringes in the Interferometric Autocorrelation Setup.

Terahertz signal is generated from Low temperature gallium arsenide photoconductive dipole antennas (gap =5μm, length = 20μm) by focusing 15 fs laser pulses and applying 12V DC across it. Terahertz intensity is detected by Pyroelectric detector (THZ1.5MB-USB). The collinear autocorrelation arrangement provides dynamic fringes which are allowed to be incident on photoconductive antennas to study the variation in terahertz intensity with respect to delay between laser pulses. Interestingly, the profile of THz intensity variation was similar to interferometric autocorrelation signal of laser pulses. The THz power attenuation with its propagation distance in atmosphere was measured. [ABSTRACT FROM AUTHOR]