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Advanced LIDT testing station in the frame of the HiLASE Project

Authors: Jan Vanda; Laura Gemini; R. Svabek; Tomas Mocek; G. Cheriaux;

Advanced LIDT testing station in the frame of the HiLASE Project

Abstract

ABSTRACT Nowadays, more powerful and challenging laser systems are built to meet the need of evolving technology. In this context, the aim of the HiLASE project [1] is to develop a multi-joule picosecond laser system working in kHz repetition rate regime. The outputs of the project will provide not only unique source for both scientific and industrial applications, but also great challenge for supporting technologies. The key parameter of all optical components in laser and beam delivery structure is the laser induced damage threshold, which limits intensities manageable by the system. The following paper presents results of LIDT test of mirrors intended to use in laser system built within the HiLASE project as well as advanced LIDT test station desi gn, which will use HiLASE laser as source. Keywords: LIDT, ISO 21254, laser, laser damage 1. INTRODUCTION Pulsed lasers operating in picosecond an d femtosecond regime have evolved rapidly in the past years, mainly regarding the intensity and repetition rate. Purely scientific setups, designed for fundamental research, have extended into application in many fields, as metrology, machining or medical devices. Apparent achievements in laser physics and progress in engineering and material science gave a rise to cutting-edge projects, as ELI-Beamlines [2] or PETAL. Utilizing of gathered knowledge and state-of-the-art then allows construction of compact devices in applied research, which can reach substantial output powers and energy densitie s. Parallel application projects, as for example HiLASE, has important role in providing engineering background for the fundamental research as well as transfer scie ntific results into application level. For this purpose, HiLASE is developing three kW class thin-disk laser lines, delivering 1-2 picosecond pulses of energy up to 1 Joule with repetition rate of 1 kHz and beam diameter 15 mm, and one multislab system delivering 2-10 nanosecond pulses of energy 100 Joules with repetition rate up to 10 Hz and beam diameter 45 mm. Due to the fast evolution of laser systems and consequent increase of the output powers, requirements on laser system components are now more demanding. Research and development of novel materials and novel measurement methods for optical coatings, mirrors, crystals and other components is highly desirable. Output parameters described above can be unattainable by common industrial lasers. Consequently, there is a significant demand for the beam time at the high power, high repetition rate devices, both fr om research laboratories and industrial companies. However, such lasers are in majority designed for scientific experiments, requiring complicated set-up to fit particular workplace, than for "test-and-go" approach. One of the main goals of application program in HiLASE project will be to remove this deficit and provide valuable workplaces allowing fast set-up and exposure variety of samples. In particular, design of highly advanced station for measuring laser induced damage threshold, utilizing HiLASE lasers, will be described further. This station will be in compliance with series of ISO 21254 standards, fully computer controlled and offering beams with parameters described in previous paragraph. Station design will employ also online detecting devices, allowing precise control of damage threshold measurement as well as observation of non-damaging effects occurring under the high-energy beams. Further, particular measurements of mirrors intended for beam delivery system in HiLASE will be presented. These measurements are focused on LIDT and effects occurred after 10

Subjects by Vocabulary

Microsoft Academic Graph classification: Beam diameter Engineering business.industry Electrical engineering Joule Context (language use) Laser science Laser law.invention Metrology law Picosecond Femtosecond Electronic engineering business

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    2
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
2
Average
Top 10%
Average