Multi-Wavelength Terahertz Parametric Generator Using a Seed Laser Based on Four-Wave Mixing

Abstract

In this study, we developed a multi-wavelength terahertz-wave parametric generator that operates with only one injection seeding laser. Tunable lasers used as an injection seeder must be single-frequency oscillators, and conventional multi-wavelength terahertz-wave parametric generator requires basically the same number of lasers as the number of wavelengths. In order to solve this problem, we developed a new external cavity semiconductor laser that incorporates a DMD in its wavelength-selective mechanism. In this process, stable multi-wavelength oscillation from a single laser was made possible by efficiently causing four-wave mixing. This seed laser can be applied to practical real-time terahertz spectroscopy by arbitrarily switching the desired wavelength to be generated and the interval between multiple wavelengths.

Special Issue “Terahertz (THz) Science in Advanced Materials, Devices and Systems”

“…Studies in THz detectors and sources, including THz parametric generator [7], optical rectification [8,9], difference frequency generation [10], and metamaterial structures for THz detectors [11], are still active research fields. This progress in detectors and sources enables us to realize real-time THz spectroscopy and practical non-destructive tests.…”