Highly efficient Cherenkov-type terahertz generation by 2-μm wavelength ultrashort laser pulses in a prism-coupled LiNbO3 layer
- 25 November 2019
- journal article
- research article
- Published by Optica Publishing Group in Optics Express
- Vol. 27 (25) , 36059-36065
Abstract
Terahertz generation by optical rectification of femtosecond laser pulses propagating in a 40-$\mu$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-$\mu$J laser pulse energy at 2100 nm.Keywords
Funding Information
- Russian Science Foundation (18-19-00486)
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