Applied Physics B

, Volume 74, Issue 7, pp 745–748

Femtosecond third-harmonic generation:. self-phase matching through a transient. Kerr grating and the way to ultrafast computing

  • J. Reif
  • R.P. Schmid
  • T. Schneider
Article

DOI: 10.1007/s003400200847

Cite this article as:
Reif, J., Schmid, R. & Schneider, T. Appl Phys B (2002) 74: 745. doi:10.1007/s003400200847

Abstract.

The third harmonic of 810-nm 100-fs pulses at 130 μJ is generated very efficiently when ultrashort pulses from two noncollinear beams interfere in an optical medium to create an instantaneous transient grating via the optical Kerr effect. The grating couples two pathways for third-harmonic generation, each taking two photons from one beam and one photon from the other beam, respectively. The coupling enables self-phase matching in the complete process, resulting in a conversion efficiency of ≈3%. Scattering an independent beam at the transient grating confirms a lifetime limited by the pulse duration, with a reaction on the order of one optical cycle. Using the second harmonic of a Ti-sapphire laser at 405 nm, it is shown that the generation of the transient Kerr grating is a general feature, requiring less than 20 μJ/pulse. By introducing a third femtosecond beam we are able to emulate various digital logic units with femtosecond response.

PACS: 42.65.Sf; 42.65.Hw; 42.65.Ky

Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • J. Reif
    • 1
  • R.P. Schmid
    • 1
  • T. Schneider
    • 2
  1. 1.Brandenburgische Technische Universität Cottbus and JointLab BTU/IHP, Universitätsplatz 3–4, 03044 Cottbus, GermanyDE
  2. 2.Deutsche Telekom AG, Fachhochschule Leipzig, Gustav-Freytag-Str. 43/45, 04277 Leipzig, GermanyDE