Multiwavelength Terahertz Parametric Generation Using Higher Order Stokes Beams

To advance real-time spectroscopy based on terahertz (THz) parametric generation, we achieved the simultaneous generation of more than ten THz wavelengths. We used higher-order Stokes beams generated at multiple wavelengths via a cascaded process within a nonlinear optical crystal as both the pump and seed beams for THz parametric generation. This allowed concurrent generation of up to thirteen THz wavelengths. This facilitated real-time spectroscopy of various reagents. The ability to generate thirteen THz wavelengths in the 1–2 THz range simultaneously greatly aids in reagent identification despite the presence of obstructions, and holds significant potential for future spectroscopic applications.