Abstract
We demonstrated a pulse-to-pulse frequency-tunable LiNbO3 terahertz-wave parametric oscillator, pumped with a Q-switched Nd:YAG laser. Rapid tuning from 1 to 2 THz, with random frequency accessibility, was achieved by rotating the pump beam angle using an optical beam scanner and a telescope.
Highlights
The terahertz wave (THz-wave) region is spectroscopically significant, because it contains a large number of molecular rotation absorption lines
Terahertz time domain spectroscopy of propane-air flames has shown that panoramic terahertz absorption measurements provide complete flame characterization for determining species concentration and flame temperature [1]
We studied a THz-wave frequency (THz)-wave parametric oscillator (TPO) using noncollinear phase matching in a LiNbO3 crystal pumped with a Q-switched Nd:YAG laser[4]
Summary
The terahertz wave (THz-wave) region is spectroscopically significant, because it contains a large number of molecular rotation absorption lines. Terahertz time domain spectroscopy of propane-air flames has shown that panoramic terahertz absorption measurements provide complete flame characterization for determining species concentration and flame temperature [1]. In such analyses, frequency-agile THz-wave sources with continuous tunability over a broad spectral range are expected to improve the sensitivity, resolution, and speed of measurement. We describe a novel method of tuning a TPO using an optical beam scanner and a 1:1 telescope This produced a TPO that was a frequency-agile THz-wave source over a broad spectral range
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