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Optimization of plasma mirror reflectivity and optical quality using double laser pulses
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Scott, G. G., Bagnoud, V., Brabetz, C., Clarke, R. J., Green, J. S., Heathcote, R. I., Powell, H. W., Zielbauer, B., Arber, T. D., McKenna, P. and Neely, D. (2015) Optimization of plasma mirror reflectivity and optical quality using double laser pulses. New Journal of Physics, 17 (3). 033027. doi:10.1088/1367-2630/17/3/033027 ISSN 1367-2630.
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Official URL: http://dx.doi.org/10.1088/1367-2630/17/3/033027
Abstract
We measure a record 96 ±2.5% specularly reflected energy fraction from an interaction with a plasma mirror (PM) surface preionized by a controlled prepulse and find that the optical quality is dependent on the inter pulse time delay. Simulations show that the main pulse reflected energy is a strong function of plasma density scale length, which increases with the time delay and reaches a peak reflectivity for a scale length of 0.3 μm, which is achieved here for a pulse separation time of 3 ps. It is found that the incident laser quasi near field intensity distribution leads to nonuniformities in this plasma expansion and consequent critical surface position distribution. The PM optical quality is found to be governed by the resultant perturbations in the critical surface position, which become larger with inter pulse time delay.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Journal or Publication Title: | New Journal of Physics | ||||||||
Publisher: | IOP Publishing | ||||||||
ISSN: | 1367-2630 | ||||||||
Official Date: | 12 March 2015 | ||||||||
Dates: |
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Volume: | 17 | ||||||||
Number: | 3 | ||||||||
Article Number: | 033027 | ||||||||
DOI: | 10.1088/1367-2630/17/3/033027 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) |
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