Comparison of CW THz Wave Spectrometer with Laser Diode Excitation and Pulsed THz Wave Spectrometer with Cr:forsterite Sources Based on Difference Frequency Generation of Near-infrared Lasers in GaP

We constructed two types of terahertz (THz) spectrometers with automatic scanning control based on the difference frequency generation method by the excitation of the phonon-polariton mode in GaP. The pulsed THz wave spectroscopic systems were based on an optical parametric oscillator and Nd: YAG la...

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Bibliographic Details
Published in:Journal of infrared, millimeter and terahertz waves millimeter and terahertz waves, 2010-10, Vol.31 (10), p.1164-1170
Main Authors: Ragam, Srinivasa, Tanabe, Tadao, Oyama, Yutaka, Watanabe, Kenta, Dezaki, Hikari
Format: Article
Language:English
Subjects:
Absorption spectra
Automatic control
Classical Electrodynamics
Construction
Continuous radiation
Deformation
Diodes
Electrical Engineering
Electronics and Microelectronics
Engineering
Excitation
Forsterite
Infrared lasers
Instrumentation
Laser diodes
Lasers
Neodymium lasers
Optical Parametric Oscillators
Parametric amplifiers
Polaritons
Polyethylene
Polyethylenes
Semiconductor lasers
Spectrometers
Spectroscopy
Terahertz frequencies
Tuning
Ultra high molecular weight polyethylene
YAG lasers
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Summary:We constructed two types of terahertz (THz) spectrometers with automatic scanning control based on the difference frequency generation method by the excitation of the phonon-polariton mode in GaP. The pulsed THz wave spectroscopic systems were based on an optical parametric oscillator and Nd: YAG laser sources having a frequency resolution of 1.5 GHz, and on Cr:fosterite sources with a resolution of 20 GHz. Following these, we recently constructed a continuous wave (CW) THz wave spectroscopic system with laser diode excitation. One of the advantages of the CW THz wave spectrometer is its wide frequency tuning range with fine frequency resolution of 
ISSN:1866-6892
1866-6906
DOI:10.1007/s10762-010-9692-2