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Better understanding the nature of work and labour within the globalised political economy is a focus of the 'Work, Labour & Globalisation Research Group'. This involves researching the effects of new forms of labour, its transnational character and the gendered aspects of contemporary migration. A Scottish perspective is provided by the Scottish Centre for Employment Research (SCER). But the research specialisms of the Department of Work, Employment & Organisation go beyond this to also include front-line service work, leadership, the implications of new technologies at work, regulation of employment relations and workplace innovation.

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Straight and linearly tapered capillaries produced by femtosecond laser micromachining

Wiggins, Mark and Reijnders, M. P. and Abu-Azoum, Salima Saleh and Hart, Kerri and Vieux, Gregory and Welsh, Gregor H. and Issac, Riju and Yang, Xue and Jones, David and Jaroszynski, Dino (2012) Straight and linearly tapered capillaries produced by femtosecond laser micromachining. Journal of Plasma Physics, 78 (specia). pp. 355-361. ISSN 0022-3778

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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.