Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 32, Issue 6, Pages 1055-1062Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.32.001055
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Funding
- Aquitaine Region [COLA2 09010502, NASA 20101304005]
- CNRS [PICS06038]
- European Commission (EC) [GA-228334, GA-284464]
- French National Research Agency (ANR) [ANR-09-BLAN-0031-02, ANR-10-IDEX-03-02]
- RFBR [12-02-91059-NCNI a]
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We perform a postcompression of high-energy pulses by using optical-field ionization of low pressure helium gas in a guided geometry. We apply this approach to a terawatt (TW) chirped-pulse-amplification-based Ti: sapphire laser chain and show that spectral broadening can be controlled with both the input pulse energy and gas pressure. Under optimized conditions, we generate 10 fs pulses at the TW level directly under vacuum and demonstrate a high stability of the postcompressed pulse duration. These high-energy postcompressed pulses are thereafter used to perform high harmonic generation in a loose focusing geometry. The extreme ultraviolet (XUV) beam is characterized both spatially and spectrally on a single shot basis, and structured continuous XUV spectra are observed. (C) 2015 Optical Society of America
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