Open AccessTerahertz difference-frequency generation by tilted amplitude front excitation
Author(s) -
М. И. Бакунов,
M. V. Tsarev,
E. A. Mashkovich
Publication year - 2012
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.028573
Subject(s) - optics , optical rectification , materials science , terahertz radiation , laser , femtosecond , tilt (camera) , grating , diffraction grating , wavefront , wavelength , optoelectronics , nonlinear optics , physics , mechanical engineering , engineering
To circumvent a velocity mismatch between optical pump and terahertz waves in electro-optic crystals, we propose to use dual-wavelength optical beams tilted with respect to their planes of equal amplitude. The tilt is achieved by transmission of a dual-wavelength laser beam through a diffraction grating placed on the crystal boundary. The proposed technique extends optical rectification of tilted-front femtosecond laser pulses to difference-frequency generation with longer (nanosecond) pulses. Our analysis of the technique for LiNbO(3) pumped at 1.3 μm and GaAs pumped at 1.55 μm shows its efficiency.