Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 85, Issue 4, Pages 525-529Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-006-2390-z
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- Engineering and Physical Sciences Research Council [GR/S22400/01] Funding Source: researchfish
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We have investigated experimentally the energy transmission and spectral broadening of 30-fs, 700-mu J laser pulses in a neon-filled, 250-mu m inner diameter hollow fibre. We implement a differentially pumped fibre, where a vacuum is maintained at the fibre entrance, and compare this to a statically filled fibre. We obtain significantly higher transmission and increased spectral broadening in the differentially pumped case due to a reduction of ionisation defocusing at the fibre entrance. This arrangement provides a method for the generation of near-transform- limited pulses with smoothly varying pulse duration whilst maintaining constant pulse energy, by simple adjustment of the gas pressure. Compression of similar to 450-mu J pulses from the differentially pumped fibre to a duration of 6.5 fs has been achieved for pulses with spectra spanning 650-900 nm, by use of negatively dispersive chirped mirrors.
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