Frequency conversion by means of Kerr nonlinearity is one of the most common and exploited nonlinear optical processes in the UV, visible, IR, and mid-IR spectral regions. Here we show that wave mixing of an optical field and a terahertz wave can be achieved in diamond, resulting in the frequency conversion of the terahertz radiation either by sum- or difference-frequency generation. In the latter case, we show that this process is phase matched and most efficient in a counterpropagating geometry.
© 2013 Optical Society of America
Original Manuscript: October 9, 2012
Revised Manuscript: November 26, 2012
Manuscript Accepted: December 12, 2012
Published: January 10, 2013
Matteo Clerici, Lucia Caspani, Eleonora Rubino, Marco Peccianti, Marco Cassataro, Alessandro Busacca, Tsuneyuki Ozaki, Daniele Faccio, and Roberto Morandotti, "Counterpropagating frequency mixing with terahertz waves in diamond," Opt. Lett. 38, 178-180 (2013)