The L4n is a nanosecond-kilojoule laser beamline that delivers temporally shapeable nanosecond pulses at a maximum energy of 1.2 kJ. It was recently commissioned at ELI Beamlines and offers unique opportunities for high-pressure, high-energy-density physics, and laser-plasma interaction experiments, particularly due to its high repetition rate of up to 1 shot per minute. Compared to other kJ-class laser systems worldwide, which offer much lower shot rates, the L4n driven experiments will enable significant improvements in collecting data statistics. The results gathered during the first L4n commissioning campaigns, demonstrate the laser capability to deliver hundreds of joules every three minutes with excellent repeatability and clearly show its potential to make significant contributions to the field of high-energy density physics in the coming decades.
Laser Induced Contamination (LIC) is one of the major issues in high energy high repetition rate laser systems. The growth of contamination during the operation of the laser influences the components spectral performance and can lead to the catastrophic damage. Several previous investigations indicate that LIC growth depends on the coatings material and even its deposition method. In our work, we investigate electron-beam deposited HR mirrors for the wavelength of 800 nm. Three different designs were tested in vacuum conditions under high repetition and high energy laser irradiation using femtosecond pulses. Two of the designs are based on quarter wavelength optical thickness (QWOT) layers: last layer of the first mirror is high refractive index film, hafnia in our case, and for the second mirrors the last layer was double QWOT of low refractive index film, silica in our case. For the last coating the E-field was modified by changing the last silica layer thickness. All samples were irradiated below the damage threshold level and LIC observed under confocal microscope. Analysis were obtained by comparing the influence of the last layer and E-field distribution within the multilayer coatings. Conclusions and recommendations for LIC reduction will be presented.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.