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Title: Terahertz-bandwidth pulses for coherent time-domain spectroscopy

Abstract

Ultrashort pulses of electromagnetic radiation propagating through free space are used to perform coherent time-domain spectroscopy by probing the complex index of refraction of various materials, in particular thin films of high-critical-temperature superconductors and the microwave substrates the support them. The terahertz beam system utilizes Hertz ion-dipole-like antennas consisting of a dc-biased photoconductive gap in a coplanar stripline as a transmitter, and an identical receiver with a photoconductive gap biased by the THz radiation. The transmitter is driven to produce the short radiation bursts by a 100-fs optical pulse from a Ti:sapphire self-mode-locked laser, while the receiver is synchronously gated by laser pulses split from the original beam. By performing measurements in the time domain and transforming data to the frequency domain, both the real and imaginary parts of the index of refraction of dielectrics and the conductivity of superconductors are determined over the entire range from {approximately}200 GHz to several terahertz. This technique allows the direct broadband determination of these quantities in the millimeter-wave and submillimeter-wave regimes from the measurement of only a few time-domain waveforms and without the need for Kramers-Kroenig analysis or complicated processing.

Authors:
; ;  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Center for Ultrafast Optical Science
Publication Date:
OSTI Identifier:
94444
Report Number(s):
CONF-940142-
ISBN 0-8194-1440-9; TRN: 95:018791
Resource Type:
Book
Resource Relation:
Conference: OE/LASE `94: conference on optics, electro-optics, and laser applications in science and engineering, Los Angeles, CA (United States), 22-29 Jan 1994; Other Information: PBD: 1994; Related Information: Is Part Of Nonlinear optics for high-speed electronics and optical frequency conversion. Proceedings, SPIE Volume 2145; Peygambarian, N.; Everitt, H.; Eckardt, R.C.; Lowenthal, D.D. [eds.]; PB: 366 p.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HIGH-TC SUPERCONDUCTORS; PHYSICAL PROPERTIES; SPECTROSCOPY; LANTHANUM OXIDES; ALUMINIUM OXIDES; BARIUM OXIDES; BISMUTH OXIDES; POTASSIUM OXIDES; ZIRCONIUM OXIDES; FOURIER TRANSFORM SPECTROMETERS; FAR INFRARED RADIATION; MICROWAVE RADIATION; EXPERIMENTAL DATA; SUBSTRATES; PENETRATION DEPTH; ELECTRIC CONDUCTIVITY

Citation Formats

Whitaker, J F, Gao, F, and Liu, Y. Terahertz-bandwidth pulses for coherent time-domain spectroscopy. United States: N. p., 1994. Web.
Whitaker, J F, Gao, F, & Liu, Y. Terahertz-bandwidth pulses for coherent time-domain spectroscopy. United States.
Whitaker, J F, Gao, F, and Liu, Y. 1994. "Terahertz-bandwidth pulses for coherent time-domain spectroscopy". United States.
@article{osti_94444,
title = {Terahertz-bandwidth pulses for coherent time-domain spectroscopy},
author = {Whitaker, J F and Gao, F and Liu, Y},
abstractNote = {Ultrashort pulses of electromagnetic radiation propagating through free space are used to perform coherent time-domain spectroscopy by probing the complex index of refraction of various materials, in particular thin films of high-critical-temperature superconductors and the microwave substrates the support them. The terahertz beam system utilizes Hertz ion-dipole-like antennas consisting of a dc-biased photoconductive gap in a coplanar stripline as a transmitter, and an identical receiver with a photoconductive gap biased by the THz radiation. The transmitter is driven to produce the short radiation bursts by a 100-fs optical pulse from a Ti:sapphire self-mode-locked laser, while the receiver is synchronously gated by laser pulses split from the original beam. By performing measurements in the time domain and transforming data to the frequency domain, both the real and imaginary parts of the index of refraction of dielectrics and the conductivity of superconductors are determined over the entire range from {approximately}200 GHz to several terahertz. This technique allows the direct broadband determination of these quantities in the millimeter-wave and submillimeter-wave regimes from the measurement of only a few time-domain waveforms and without the need for Kramers-Kroenig analysis or complicated processing.},
doi = {},
url = {https://www.osti.gov/biblio/94444}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {12}
}

Book:
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