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Proceedings Paper

Generation of sub-30-fs pulses from a scaleable high-energy oscillator
Author(s): Alexander Fuerbach; Alma del Carmen Fernandez Gonzalez; Alexander A. Apolonski; Enikoe Seres; Takao Fuji; Ferenc Krausz
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Paper Abstract

We report on the generation of sub-30fs pulses from a mirror-dispersion-controlled (MDC) Ti:sapphire oscillator, containing a multiple-pass Herriott-cell for increasing the cavity length. Using that scheme, repetition rates down to some few MHz could be achieved. To avoid multiple pulsing instabilities, we operate the laser in a regime of slight positive group-delay dispersion (GDD) over a very broad wavelength range. This results in the formation of strongly chirped light pulses, reducing the otherwise very high peak-intensity inside the laser crystal, which would limit the maximum output energy. We have investigated the spectral phase associated with these pulses with the help of the well known SPIDER-technique, and, based on the results, have constructed an optimized compressor. When pumped with the full 10 W of a frequency-doubled Nd:YVO4 laser (Coherent Verdi V10), output energies well above 200 nJ could be obtained. As no signs of instabilities were observed, we believe, that our approach is scaleable to even higher energies if more powerful pump lasers are used. Thanks to the excellent beam profile, high-resolution micromachining of various materials, including transparent dielectrica could be demonstrated. Results on sub-micrometer surface modification of transparent materials will be presented.

Paper Details

Date Published: 1 June 2004
PDF: 8 pages
Proc. SPIE 5340, Commercial and Biomedical Applications of Ultrafast Lasers IV, (1 June 2004); doi: 10.1117/12.547982
Show Author Affiliations
Alexander Fuerbach, FEMTOLASERS Produktions GmbH (Austria)
Alma del Carmen Fernandez Gonzalez, Technische Univ. Wien (Austria)
Alexander A. Apolonski, Technische Univ. Wien (Austria)
Enikoe Seres, Technische Univ. Wien (Austria)
Takao Fuji, Technische Univ. Wien (Austria)
Ferenc Krausz, Technische Univ. Wien (Austria)

Published in SPIE Proceedings Vol. 5340:
Commercial and Biomedical Applications of Ultrafast Lasers IV
Joseph Neev; Christopher B. Schaffer; Andreas Ostendorf, Editor(s)

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