Open AccessHighly efficient Cherenkov-type terahertz generation by 2-μm wavelength ultrashort laser pulses in a prism-coupled LiNbO3 layer
Author(s) -
S. B. Bodrov,
Igor Ilyakov,
B. V. Shishkin,
М. И. Бакунов
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.036059
Subject(s) - optics , terahertz radiation , laser , optical rectification , materials science , femtosecond , prism , ultrashort pulse , wavelength , energy conversion efficiency , far infrared laser , optoelectronics , nonlinear optics , physics
Terahertz generation by optical rectification of femtosecond laser pulses propagating in a 40- μ m thick LiNbO 3 layer attached to an output Si prism has been experimentally investigated for different laser wavelengths from 800 to 2100 nm. For longer wavelengths, the saturation of the optical-to-terahertz conversion efficiency has been observed at higher laser pulse energies, thus enabling higher efficiencies. In particular, record high conversion efficiency of 1.3% has been achieved with 30- μ J laser pulse energy at 2100 nm.