title: Frequency-agile terahertz-wave parametric oscillator in a ring-cavity configuration.
abstract: We demonstrate a frequency-agile terahertz wave parametric oscillator (TPO) in a ring-cavity configuration (ring-TPO). The TPO consists of three mirrors and a MgO:LiNbO(3) crystal under noncollinear phase-matching conditions. A novel, fast frequency-tuning method was realized by controlling a mirror of the three-mirror ring cavity. The wide tuning range between 0.93 and 2.7 THz was accomplished. For first demonstration using the ring-TPO, terahertz spectroscopy was performed as the verification of the frequency-agile performance, measuring the transmission spectrum of the monosaccharide glucose. The spectrum was obtained within about 8 s in good comparison to those of Fourier transform infrared spectrometer.
authors.affiliation: Advanced Science Institute, RIKEN Sendai, Aramaki Aoba, Sendai 980-0845, Japan. minamide@riken.jp
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Minamide
authors.forename: Tomofumi
authors.initials: T
authors.lastname: Ikari
authors.forename: Hiromasa
authors.initials: H
authors.lastname: Ito