Note: Femtosecond laser micromachining of straight and linearly tapered capillary discharge waveguides

Wiggins, S. M.; Reijnders, M. P.; Abuazoum, S.; Hart, K.; Welsh, G. H.; Issac, R. C.; Jones, D. R.; Jaroszynski, D. A.
September 2011
Review of Scientific Instruments;Sep2011, Vol. 82 Issue 9, p096104
Academic Journal
Gas-filled capillary discharge waveguides are important structures in laser-plasma interaction applications, such as the laser wakefield accelerator. We present the methodology for applying femtosecond laser micromachining in the production of capillary channels (typically 200-300 μm in diameter and 30-40 mm in length), including the formalism for capillaries with a linearly tapered diameter. The latter is demonstrated to possess a smooth variation in diameter along the length of the capillary (tunable with the micromachining trajectories). This would lead to a longitudinal plasma density gradient in the waveguide that may dramatically improve the laser-plasma interaction efficiency in applications.


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