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Coherent amplification of XUV femtosecond pulses in plasmas
CNRS-Université Paris-Sud, Orsay
Optical Physics Plasma Physics 
Full Description:

Lasers in the XUV spectral region (wavelength ~ 5 - 50 nm) are now routinely generated from hot and dense plasmas, in which a strong population inversion is created. Until recently these XUV lasers were operated in single-pass amplification, with spontaneous self-emission of the plasma as a
seed of the laser effect. A more advanced operation mode is now investigated, in which the seed is an external ultrashort coherent pulse at the same wavelength but of low energy.

This advanced, so-called "seeded", operation mode is a promising way to upgrade the performances of XUV lasers significantly, in terms of beam quality and pulse peak power. This PhD thesis program will address one of the main current challenges of the field, which is to reduce the duration of the amplified XUV pulse to the femtosecond range. Such an ultrashort pulse duration is desired for a broad range of scientific applications.

To progress towards this goal requires a better theoretical understanding of the interaction between the injected ultrashort XUV pulse and the inverted plasma medium, as well as an accurate experimental characterization of the temporal and spectral properties of the seeded XUV laser pulse. The PhD candidate will be involved in both aspects of this project.

He/she will develop numerical simulations involving classical laser physics equations, although applied to the specific conditions of XUV lasers, where the amplifying medium is a highly ionized plasma with high density and high temperature. These numerical simulations will be used to guide the choice of the experimental parameters towards shorter XUV pulse duration, as well as to help the data interpretation.

He/she will participate to the design and set-up of a new instrument aimed at the measurement of the XUV pulse temporal structure with femtosecond resolution. The experiments will be performed at different high-power laser facilities, in France or abroad.

Posted on: 06 November 2014Deadline to apply: 01 March 2015Start Date: 01 October 2015 Duration: 36 months
The Fund category is Not Defined and the salary is Not Specified
Doctoral School is Waves and matter in the Ile-de-France Region.

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