Terahertz spectrum analyzer based on a terahertz frequency comb

Precision frequency measurements of terahertz (THz) waves are required to establish metrology in the THz spectral region. However, frequency measurement techniques in this region are immature. We propose a THz spectrum analyzer to measure the absolute frequency and spectral shape of continuous-wave...

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Bibliographic Details
Published in:Optics express 2008-08, Vol.16 (17), p.13052-13061
Main Authors: Yokoyama, Shuko, Nakamura, Ryotaro, Nose, Masaki, Araki, Tsutomu, Yasui, Takeshi
Format: Article
Language:English
Subjects:
Equipment Design
Equipment Failure Analysis
Filtration - instrumentation
Microwaves
Spectrophotometry, Infrared - instrumentation
Spectrophotometry, Infrared - methods
Transducers
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Summary:Precision frequency measurements of terahertz (THz) waves are required to establish metrology in the THz spectral region. However, frequency measurement techniques in this region are immature. We propose a THz spectrum analyzer to measure the absolute frequency and spectral shape of continuous-wave THz waves. Based on a stable frequency comb generated in a photoconductive antenna, the absolute frequency of a sub- THz test source was determined at a precision of 2.8 x 10(-11). Furthermore, the spectral bandwidth of the THz spectrum analyzer can be extended over 1 THz, as demonstrated by measurement of a THz test source. This spectrum analyzer has the potential to become a powerful tool for THz frequency metrology.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.16.013052