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DIODE-PUMPED TERAHERTZ PHOTOMIXING SPECTRAMETER

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/13885

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Title: DIODE-PUMPED TERAHERTZ PHOTOMIXING SPECTRAMETER
Creators: Van Rooij, J. M.; Pine, A. S.; Suenram, R. D.
Issue Date: 1997
Publisher: Ohio State University
Abstract: We previously demonstrated a high-resolution terahertz $spectrometer^{b}$ by mixing dye lasers in a fast low-temperature-grown (LTG)-GaAs photoconductor with submicron interdigital electrodes feeding a broadband complementary spiral antenna which radiates the coherent terahertz beat through a sample gas cell to a composite Si bolometer. We have upgraded the system efficiency, range and sensitivity by replacing the dye lasers with near-infrared diode,.lasers, using lower capacitance photomixers and detecting the far-ir radiation with a faster response hot-electron InSb bolometer. The fixed-tuned laser is a single-frequency $(\lambda \approx 852 nm)$ distributed-Bragg-reflector (DBR)GaAIAs diode, self-locked to a confocal interferometer and the tunable diode laser is a broadband quantum-well $(828 \leq \lambda \leq 858 nm)$ single-mode Littman-Metcalf external-cavity oscillator and a tapered planar amplifier, with precision linear piezoelectric tuning of up to 60 GHz and complete spectral coverage from 0.1 to 2 THz. Sample spectra will be given.
Description: $^{a}$Also, Department of Physics, Catholic University of Nijmegen, the Netherlands. $^{b}$A.S. Pine, R.D. Suenram E.R. Brown and K.A. Mulntosh J. Mo1. Spectrosc. \textbf{175}, 37(1996).
Author Institution: Optical Technology Division, National Institute of Standards and Technology
URI: http://hdl.handle.net/1811/13885
Other Identifiers: 1997-MI-07
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