"Toward generation of μJ range sub-ps THz pulses by optical rectification
"B. Bartal, I. Z. Kozma, A. G. Stepanov, G. Almási, J. Kuhl, E. Riedle, and J. Hebling
Appl. Phys. B 86, 419 - 423 (2007)
Recently the possibility of scaling up the energy of sub-ps THz pulses generated in lithium-niobate by tilted pulse front excitation was demonstrated. Using 500 µJ energy pump pulses at 780 nm center wavelength, up to 240 nJ THz energy was achieved. In this article, results of calculations using a simple model predict the possibility of increasing the THz pulse energy above 1 µJ and the quantum efficiency up to 50 % by decreasing the temperature. The dependence of the THz pulse energy and the maximum achievable electric field on the crystal length and the pump pulse duration is also presented. According to the calculations, generation of the maximum THz energy needs a specific pump pulse duration, because of in-creasing dispersion and absorption with increasing frequency. Not only longer, but also shorter pulses lead to a degradation of the THz energy. Results of calculations for GaSe, GaP and ZnTe are also presented.
BMO authors (in alphabetic order):
Ida Zsuzsanna Kozma