Applied Physics B

, Volume 108, Issue 4, pp 821–826

Design of a contact grating setup for mJ-energy THz pulse generation by optical rectification

Authors

    • Institute of PhysicsUniversity of Pécs
  • János Hebling
    • Institute of PhysicsUniversity of Pécs
    • High-Field Terahertz Research GroupMTA-PTE
  • Gábor Almási
    • Institute of PhysicsUniversity of Pécs
    • High-Field Terahertz Research GroupMTA-PTE
Article

DOI: 10.1007/s00340-012-5201-8

Cite this article as:
Ollmann, Z., Hebling, J. & Almási, G. Appl. Phys. B (2012) 108: 821. doi:10.1007/s00340-012-5201-8

Abstract

According to the recent calculations, more efficient THz pulse generation is possible using relief grating on the front surface of the generating LiNbO3 (LN) crystal for tilted-pulse-front-excitation rather than imaging the pump spot on a reflection grating into the LN crystal. Very recently, it was shown that—compared to a free-standing LN surface-relief grating—significantly higher diffraction efficiency can be reached if the grating profiles are filled with fused silica. Since realisation of such a setup is technically very challenging, in the present paper, we analyse the case where the input side of the LN grating is immersed into a refractive index matching liquid (RIML) instead of a solid material. Our results showed that the diffraction efficiency remains above 90 % for a refractive index ranging 1.45–1.60 of the applied RIML, and it is as high as 99 % for using the RIML for BK7. For this case, we carried out detailed calculations for various grating parameters. We propose a practical setup applying tilted input and slightly tilted output surfaces resulting in low losses and high diffraction efficiency for the pump. We conclude that a contact grating setup using BK7 RIML is suitable for producing THz pulses even in the mJ-energy range.

Copyright information

© Springer-Verlag 2012