Coherent field transients below 15  THz from phase-matched difference frequency generation in 4H-SiC

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. Th...

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Bibliographic Details
Published in:Optics letters 2017-07, Vol.42 (14), p.2687-2690
Main Authors: Fischer, Marco P, Bühler, Johannes, Fitzky, Gabriel, Kurihara, Takayuki, Eggert, Stefan, Leitenstorfer, Alfred, Brida, Daniele
Format: Article
Language:English
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Summary: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.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.42.002687