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High power laser handbook
\"In-depth details on kilowatt level high-power lasers and their commercial, industrial, and military applicationsHigh Power Laser Handbook introduces the physics and engineering of high-power laser sources as well as their most relevant applications. This work provides a useful and up-to-date reference by compiling, in a single source, a description of the state of the art across a broad range of laser technologies. The book emphasizes phenomenology over first principles derivations to streamline the presentation and enable discussion of applications. High Power Laser Handbook Is edited by three engineers from industry leader Northrop Grumman Presents thorough physical principles of high-power lasers Includes all types of high-power lasers including gas lasers, chemical lasers, free electron lasers, semiconductor lasers, and SSL Covers typical performance parameters for each major class of lasers and what constitutes \"high power\" for a particular class Features examples of real-world applications The state of the art of high-power lasers: General Principles of Lasers; Gas Lasers; Chemical Lasers; Free Electron Lasers; Semiconductor Lasers; Solid State Lasers; Fiber Lasers; Beam Combining; Nonlinear Processes and Wavelength Conversion\"-- Provided by publisher.
Book
Petawatt and exawatt class lasers worldwide
In the 2015 review paper ‘Petawatt Class Lasers Worldwide’ a comprehensive overview of the current status of high-power facilities of${>}200~\\text{TW}$was presented. This was largely based on facility specifications, with some description of their uses, for instance in fundamental ultra-high-intensity interactions, secondary source generation, and inertial confinement fusion (ICF). With the 2018 Nobel Prize in Physics being awarded to Professors Donna Strickland and Gerard Mourou for the development of the technique of chirped pulse amplification (CPA), which made these lasers possible, we celebrate by providing a comprehensive update of the current status of ultra-high-power lasers and demonstrate how the technology has developed. We are now in the era of multi-petawatt facilities coming online, with 100 PW lasers being proposed and even under construction. In addition to this there is a pull towards development of industrial and multi-disciplinary applications, which demands much higher repetition rates, delivering high-average powers with higher efficiencies and the use of alternative wavelengths: mid-IR facilities. So apart from a comprehensive update of the current global status, we want to look at what technologies are to be deployed to get to these new regimes, and some of the critical issues facing their development.
Journal Article
10 PW peak power femtosecond laser pulses at ELI-NP
We report on the generation and delivery of 10.2 PW peak power laser pulses, using the High Power Laser System at the Extreme Laser Infrastructure – Nuclear Physics facility. In this work we demonstrate for the first time, to the best of our knowledge, the compression and propagation of full energy, full aperture, laser pulses that reach a power level of more than 10 PW.
Journal Article
High-energy hybrid femtosecond laser system demonstrating 2 × 10 PW capability
We report on a two-arm hybrid high-power laser system (HPLS) able to deliver 2 × 10 PW femtosecond pulses, developed at the Bucharest-Magurele Extreme Light Infrastructure Nuclear Physics (ELI-NP) Facility. A hybrid front-end (FE) based on a Ti:sapphire chirped pulse amplifier and a picosecond optical parametric chirped pulse amplifier based on beta barium borate (BBO) crystals, with a cross-polarized wave (XPW) filter in between, has been developed. It delivers 10 mJ laser pulses, at 10 Hz repetition rate, with more than 70 nm spectral bandwidth and high-intensity contrast, in the range of 1013:1. The high-energy Ti:sapphire amplifier stages of both arms were seeded from this common FE. The final high-energy amplifier, equipped with a 200 mm diameter Ti:sapphire crystal, has been pumped by six 100 J nanosecond frequency doubled Nd:glass lasers, at 1 pulse/min repetition rate. More than 300 J output pulse energy has been obtained by pumping with only 80% of the whole 600 J available pump energy. The compressor has a transmission efficiency of 74% and an output pulse duration of 22.7 fs was measured, thus demonstrating that the dual-arm HPLS has the capacity to generate 10 PW peak power femtosecond pulses. The reported results represent the cornerstone of the ELI-NP 2 × 10 PW femtosecond laser facility, devoted to fundamental and applied nuclear physics research.
Journal Article
Cryogenic nanosecond and picosecond high average and peak power (HAPP) pump lasers for ultrafast applications
Using cryogenic laser technology, it is now possible to design and demonstrate lasers that have concomitant high average and peak powers, with near-diffraction-limited beam quality. We refer to these new laser systems as HAPP lasers. In this paper, we review important laser crystal materials properties at cryogenic temperature, with an emphasis on Yb lasers, and discuss the important design considerations, including the laser-induced damage threshold, nonlinear effects and thermal effects. A comprehensive model is presented to describe diode pulsed pumping with arbitrary duration and repetition rate, and is used with the Frantz–Nodvik equation to describe, to first order, the performance of HAPP laser systems. A computer code with representative results is also described.
Journal Article
Water jet guided high-power laser energy transmission loss analysis
Water jet-guided laser is a novel machining technique. With the continuous emergence of high-hardness, high-strength materials and the increasing demand for efficient processing, the coupling of waterjet with high-power lasers has become an inevitable trend in developing water-guided lasers. However, the coupling and transmission of high-power laser energy with a water jet during the processing process introduce a series of issues, including transmission losses, which will emerge as crucial challenges limiting the development of this technology. Therefore, it is imperative to investigate the transmission losses of high-power laser energy guided by water jets. This study addresses this issue by employing the finite element method (FEM) to solve Maxwell's equations numerically, conducting wave optics simulations of the propagation of high-power lasers in water jets, and obtaining the electric field distribution of the laser beam within the water jet. Simultaneously, an investigation into the relationship between different laser beam diameters, waterjet diameters, lengths, and the energy loss of the laser is conducted to analyze the transmission losses of high-power lasers in waterjets. Finally, transmission efficiency measurements of laser coupled with a water jet are conducted utilizing a self-designed water-guided laser experimental platform. The effectiveness of the model is validated by comparing experimental results with simulations. The research findings will provide valuable insights into regulating the transmission efficiency of high-power lasers within water jets.
Journal Article
High Power Laser Science and Engineering Editorial – a celebration of ultra-high-power lasers
In 2019 we published the extensive review paper ‘Petawatt and exawatt class lasers worldwide’ in High Power Laser Science and Engineering . We are delighted that the review has achieved over 1000 citations on Google Scholar and over 750 on Web of Science. We take this opportunity to reflect on the current state of the field.
Journal Article
Self-organized electromagnetic field structures in laser-produced counter-streaming plasmas
Stable structures can self-assemble in plasmas flowing at supersonic speeds, as evident in many astronomical objects. But now it is also seen in the laboratory using two plasmas travelling in opposite directions, each created by ablating a plastic disc with high-power lasers.
Self-organization
1
,
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occurs in plasmas when energy progressively transfers from smaller to larger scales in an inverse cascade
3
. Global structures that emerge from turbulent plasmas can be found in the laboratory
4
and in astrophysical settings; for example, the cosmic magnetic field
5
,
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, collisionless shocks in supernova remnants
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and the internal structures of newly formed stars known as Herbig–Haro objects
8
. Here we show that large, stable electromagnetic field structures can also arise within counter-streaming supersonic plasmas in the laboratory. These surprising structures, formed by a yet unexplained mechanism, are predominantly oriented transverse to the primary flow direction, extend for much larger distances than the intrinsic plasma spatial scales and persist for much longer than the plasma kinetic timescales. Our results challenge existing models of counter-streaming plasmas and can be used to better understand large-scale and long-time plasma self-organization.
Journal Article
Radiation Spectra and Assessing the Quality of a High-Power Laser Diode upon Entering the Operating Mode
The authors propose a way of assessing the quality of the heterostructure of a high-power 200 mW laser diode based on measuring spectra of radiation intensity in the over-the-threshold mode of generation. The procedure is based on fixing and analyzing groups of generation modes related to spatial radiation channels. The spectra are measured at different pumping currents lower than the standard for short (no more than 30 min) time intervals.
Journal Article