TITLE:
Frequency Stabilized GaP Continuous-Wave Terahertz Signal Generator for High-Resolution Spectroscopy
AUTHORS:
Tetsuo Sasaki, Tadao Tanabe, Jun-ichi Nishizawa
KEYWORDS:
Terahertz; Signal Generator; Spectrometer
JOURNAL NAME:
Optics and Photonics Journal,
Vol.4 No.1,
January
21,
2014
ABSTRACT: We constructed a GaP continuous-wave terahertz (CW-THz)
signal generator based on different frequency generation that can tune
automatically from 0.15 to 6.2 THz without mode-hopping. Independent frequency
feedback control for the seed laser and power feedback control for the optical
power amplifier realized higher accuracy and stability of the output THz-wave
at the same time. After constructing THz spectrometer with the GaP CW-THz
signal generator as a light source, we have confirmed frequency resolution to
be 15 MHz by the measurement of the Doppler width of water vapor absorptions in
vacuumed chamber, and frequency reproducibility to be within 5 MHz by comparing
with absorption frequency data.