Difference-frequency terahertz-wave generation from 4-dimethylamino-N-methyl-4-stilbazolium-tosylate by use of an electronically tuned Ti:sapphire laser

Abstract

Among nonlinear materials, the organic ionic salt crystal 4-dimethylamino- N -methyl-4-stilbazolium-tosylate (DAST) is known for its large nonlinearity. We generated a coherent terahertz (THz) wave, using DAST, from the difference frequency between two oscillating wavelengths of an electronically tuned Ti:sapphire laser. In LiNbO(3), LiTaO(3), KTiOPO(4), and GaP crystals, THz-wave generation was not observed under the same experimental conditions. This result proves the high efficiency of DAST crystals for generation of difference-frequency THz waves.

Organic Broadband TeraHertz Sources and Sensors

“…[64][65][66] By tuning the wavelength of one pump beam, THz radiation can be tuned too. In this way, a wide range of THz frequencies were achieved from a DAST crystal and multiple THz absorption bands were identified.…”

Synthesis and terahertz-wave generation of mixed crystals composed of 1-methyl-4-{2-[4-(dimethylamino)phenyl]ethenyl}pyridinium p-toluenesulfonate and p-chlorobenzenesulfonate

“…The first terahertz-wave generation from DAST was observed by using the optical rectification effect induced by 150 fs laser pulses [7]. Later, difference frequency generation (DFG) was applied for tunable terahertz-wave generation from DAST [8]. In a series of our recent studies, we have found that tunable and coherent terahertz waves could be efficiently obtained by DFG when DAST was irradiated by two beams generated from a dual-wavelength OPO pumped by a nanosecond Nd:YAG SHG laser [9][10][11][12].…”

Terahertz Frequency Metrology for Spectroscopic Applications: a Review

“…These organic crystals are ideal for ultrawide band operation, and include 4-dimethylamino-N-methyl-4-stilbavolium tosylate (DAST) [88][89][90][91][92] or N-benzyl-2-methyl-4-nitroaniline (BNA) [93,94].…”