Optical up-conversion-based cross-correlation for characterization of sub-nanosecond terahertz-wave pulses

• DOI: 10.1364/oe.452310
• Publication Date: 2022-03-14T07:30:06Z
• Authors: Yuma Takida; Kouji Nawata; Takashi Notake; Taiichi Otsuji; Hiroaki Minamide
• Keywords: Optical parametric amplifier; Nanosecond; Photon Upconversion

Using a nonlinear optical mixing known as frequency up-conversion process, we demonstrate an cross-correlation technique for the detection and characterization of sub-nanosecond (sub-ns) terahertz (THz)-wave pulses. A monochromatic THz-wave pulse from injection-seeded parametric generator (is-TPG) was mixed with near-infrared (NIR) pump to generate NIR idler in trapezoidal-prism-shaped MgO-doped lithium niobate crystal under noncollinear phase-matching condition. By measuring pump-energy crystal-length dependencies, show that sub-ns pulses without subsequent amplification can be used sensitive intensity characterization, respectively. this technique, reveal temporal profile is-TPG driven by 351-ps 1064-nm laser has slightly-frequency-dependent width range 150-190 ps at full half-maximum tunable 0.95-2.00 THz.