Applied Physics B

, Volume 74, Supplement 1, pp s237–s243

Sub-6-fs blue pulses generated by quasi-phase-matching second-harmonic generation pulse compression

  • L. Gallmann
  • G. Steinmeyer
  • G. Imeshev
  • J.-P. Meyn
  • M.M. Fejer
  • U. Keller
Article

Abstract.

We demonstrate a novel scalable and engineerable approach for the frequency-doubling of ultrashort pulses. Our technique is based on quasi-phase-matching and simultaneously provides tailored dispersion and nonlinear frequency conversion of few-cycle optical pulses. The method makes use of the spatial localization of the conversion process and the group velocity mismatch in a chirped grating structure. The total group delay of the nonlinear device can be designed to generate nearly arbitrarily chirped second-harmonic pulses from positively or negatively chirped input pulses. In particular, compressed second-harmonic pulses can be obtained. A brief summary of the underlying theory is presented, followed by a detailed discussion of our experimental results. We experimentally demonstrate quasi-phase-matching pulse compression in the sub-10-fs regime by generating few-cycle pulses in the blue to near-ultraviolet spectral range. Using this new frequency conversion technique, we generate sub-6-fs pulses centered at 405 nm by second-harmonic generation from a 8.6 fs Ti:sapphire laser pulse. The generated spectrum spans a bandwidth of 220 THz. To our knowledge, these are the shortest pulses ever obtained by second-harmonic generation.

PACS: 42.65.Ky; 42.65.Re; 42.79.Nv 

Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • L. Gallmann
    • 1
  • G. Steinmeyer
    • 1
  • G. Imeshev
    • 2
  • J.-P. Meyn
    • 3
  • M.M. Fejer
    • 2
  • U. Keller
    • 1
  1. 1.Ultrafast Laser Physics Laboratory, Institute of Quantum Electronics, Swiss Federal Institute of Technology, ETH Hönggerberg – HPT, 8093 Zürich, SwitzerlandCH
  2. 2.E.L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, USAUS
  3. 3.Fachbereich Physik, Universität Kaiserslautern, 67663 Kaiserslautern, GermanyDE

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