1.
Coherent field transients below 15 THz from phase-matched difference frequency generation in 4H-SiC.
Opt Lett
; 42(14): 2687-2690, 2017 Jul 15.
Article
in English
| MEDLINE
| ID: mdl-28708144
ABSTRACT
We experimentally demonstrate tunable, phase-matched difference frequency generation covering the spectral region below 15 THz using 4H-SiC as a nonlinear crystal. This material combines a non-centrosymmetric lattice and strong birefringence with broadband transparency at low optical frequencies. Thorough refractive index measurements in the terahertz spectral range allow us to calculate phase-matching conditions for any near-infrared pump laser source. 4H-SiC is also exploited as a detector crystal for electro-optic sampling. The results allow us to estimate the effective second-order nonlinear coefficient.