Abstract

The theory presented here considers the generation of THz-radiation via optical rectification of near infrared fs pulses in periodically poled nonlinear materials under an arbitrary angle between the near infrared pump beam and the generated THz beam including forward and backward direction, emission perpendicular to the surface and Cherenkov radiation. This type of THz-gen- eration has proven to be very efficient for the generation of tunable narrowband THz pulses¹'⁵ which can easily be tuned by various methods. In particular, the emission of THz-radiation perpendicular to the propagation of the near infrared pump pulse allows for efficient generation as the influence of any strong absorption of THz- radiation in the nonlinear material can be reduced considerably.

© 2002 Optical Society of America