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- Title
Straight and linearly tapered capillaries produced by femtosecond laser micromachining.
- Authors
WIGGINS, S. M.; REIJNDERS, M. P.; ABUAZOUM, S.; HART, K.; VIEUX, G.; WELSH, G. H.; ISSAC, R. C.; YANG, X.; JONES, D. R.; JAROSZYNSKI, D. A.
- Abstract
Gas-filled capillary discharge waveguides are a commonly employed medium in laser–plasma interaction applications, such as the laser wakefield accelerator, because they can simultaneously guide high-power laser pulses while acting as the medium for acceleration. In this paper, the production of both straight and linearly tapered capillaries using a femtosecond laser micromachining technique is presented. A tapered capillary is shown to possess a smooth variation in diameter (from 305 μm to 183 μm) along its entire 40 mm length, which would lead to a longitudinal plasma density gradient, thereby dramatically improving the laser–plasma interaction efficiency in applications. Efficient guiding with up to 82% energy transmission of the fundamental Gaussian mode of a low intensity, 50 fs duration laser pulse is shown for both types of capillary waveguide.
- Subjects
FEMTOSECOND lasers; MICROMACHINING; PLASMA waveguides; ELECTRIC discharges; LASER plasmas; PARTICLE acceleration; PLASMA density
- Publication
Journal of Plasma Physics, 2012, Vol 78, Issue 4, p355
- ISSN
0022-3778
- Publication type
Article
- DOI
10.1017/S0022377812000062