title: Low-threshold, narrow-line THz-wave parametric oscillator with an intra-cavity grazing-incidence grating.
abstract: We report a low-threshold, narrow-line THz-wave parametric oscillator with an intra-cavity grazing-incidence grating and a 1-mm thick, 45-mm long lithium-niobate planar waveguide. When pumped by an actively Q-switched Nd:YAG laser, the threshold energy and intensity of the parametric oscillator were about 2.2 mJ and 70 MW/cm(2), respectively. The linewidths of the output THz wave were 12 and 134 GHz with and without the intra-cavity grating, respectively.
authors: Department of Electrical Engineering, Institute of Photonics Technologies, National Tsinghua University, Hsinchu 30013, Taiwan.
authors: T D
authors: TD
authors: Wang
authors: Y Y
authors: YY
authors: Lin
authors: S Y
authors: SY
authors: Chen
authors: A C
authors: AC
authors: Chiang
authors: S T
authors: ST
authors: Lin
authors: Y C
authors: YC
authors: Huang
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D007259:Infrared Rays; D053844:Lasers, Solid-State; D008872:Microwaves; D055095:Optics and Photonics / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*