The ABCD matrix for parabolic reflectors and its application to astigmatism free four-mirror cavities

Dupraz, Kevin; Cassou, K.; Zomer, F.

doi:10.1016/j.optcom.2015.05.021

Cited by 14 publications

(13 citation statements)

References 29 publications

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“…A very high finesse optical cavity, typically above 20000 is of major interest to reduce the average power delivered by the laser amplifier in a cost reduction strategy. The mechanical design must be stable while providing enough flexibility to adjust the cavity round-trip length, which leads to the choice of four-mirror geometries [21,22].…”

Section: Introductionmentioning

confidence: 99%

Modal instability suppression in a high-average-power and high-finesse Fabry–Perot cavity

et al. 2019

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An experimental method to remove modal instabilities induced by thermoelastic deformation in optical high finesse resonators is presented and experimentally investigated. The method is found suitable for multi-mirror folded monolithic and compact cavities as those used in particle accelerator environment. It is also suitable for very large stacked average power. Stable operation at 200 kW intracavity average power is experimentally demonstrated.

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Section: Introductionmentioning

confidence: 99%

Modal instability suppression in a high-average-power and high-finesse Fabry–Perot cavity

et al. 2019

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“…Low noise oscillators recently available enable the use of a high-finesse cavity in order to reduce the cost of high average power laser amplifiers. Eventually, to avoid mirror damage and to optimize the laser beam shape at the Compton IP, various cavity geometry and boundary shapes have been proposed [375][376][377][378][379].…”

Section: Photon Beam Systemsmentioning

confidence: 99%

International workshop on next generation gamma-ray source

Howell¹,

Ahmed²,

Afanasev³

et al. 2021

J. Phys. G: Nucl. Part. Phys.

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A workshop on The Next Generation Gamma-Ray Source sponsored by the Office of Nuclear Physics at the Department of Energy, was held November 17-19, 2016 in Bethesda, Maryland. The goals of the workshop were to identify basic and applied research opportunities at the frontiers of nuclear physics that would be made possible by the beam capabilities of an advanced laser Compton beam facility. To anchor the scientific vision to realistically achievable beam specifications using proven technologies, the workshop brought together experts in the fields of electron accelerators, lasers, and optics to examine the technical options for achieving the beam specifications required by the most compelling parts of the proposed research programs. An international assembly of participants included current and prospective γ-ray beam users, accelerator and light-source physicists, and federal agency program managers. Sessions were organized to foster interactions between the beam users and facility developers, allowing for information sharing and mutual feedback between the two groups. The workshop findings and recommendations are summarized in this whitepaper.

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“…Thus, in enhancement cavities employing spherical mirrors, the peak intensity is limited to the 10 15 W/cm 2 -level assuming a damage threshold of 10 11 W/cm 2 . Higher intensities might be obtained using parabolic reflectors [126] or by increasing the beam divergence, e.g. by employing Gauss-Bessel beams [80,127,128].…”

Section: Spherical Aberrationsmentioning

confidence: 99%

“…This might be possible with mirrors with an even lower absorption (for cw lasers at 1064 nm a value of 0.2 ppm has been reported [157]), by employing a grating-based reflective input coupler on a ULE substrate [138], or if superior materials such as diamond become available in the future [57,110]. Spherical aberrations can be avoided using parabolic reflectors [126]. However, it is yet to be demonstrated if the delicate adjustment of parabolas is possible in enhancement cavities with several kilowatt of average power.…”

Section: Power Scaling Of Enhancement Cavities For Inverse-compton Scmentioning

confidence: 99%

Enhancement Cavities for the Generation of Extreme Ultraviolet and Hard X-Ray Radiation

Carstens

2018

Springer Theses

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There are no lasers operating in the extreme ultraviolet or x-ray spectral region. Here, the only possibility to obtain coherent radiation in a laboratory scale is frequency conversion from lasers operating at other wavelengths. These processes are in general very inefficient. Thus, it is advantageous to recycle the non-converted light in an enhancement cavity. This thesis is about the scaling of average power and intensity in ultrashort pulse enhancement cavities. Here, pulses from a modelocked laser are continuously coupled into an external optical resonator, allowing for a pulse energy enhancement of orders of magnitude. The main applications are on the one hand the generation of high harmonics of the near infrared light into the extreme ultraviolet spectral region, and on the other hand the generation of hard x-ray radiation via inverse Compton scattering (also known as Thomson scattering). For both applications intensities ranging from 10 13 −10 15 W/cm 2 with several kilowatt of average power are required. In this regime, avoiding damage of the cavity mirrors is difficult. To this end, the circulating beam must have a large cross section on all cavity optics. In this work, design criteria aiming at this are developed and its implementation, in particular regarding the misalignment sensitivity, is investigated and demonstrated. Furthermore, the optimization of the resonator's thermal properties is necessary for fulfilling the target parameters. Here, this is achieved both by proper choice of the cavity geometry, and by custom mirrors with reduced absorption and improved thermal deformation. This allowed for average powers of several 100s of kilowatts with ultrashort pulses. This power regime is in particular interesting for inverse Compton scattering. These finding were used for the enhancement of 30-fs pulses to 10 kW of average power. This allowed for the generation of high harmonics with photon energies exceeding 100 eV at 250 MHz repetition rate. In this experiment, for the first time the photon flux was sufficient for experiments aiming at the study of dynamics on surfaces using photo electron emission microscopy (PEEM). Danksagung Diese Arbeit war nur durch die Unterstützung vieler Menschen möglich, denen ich hiermit danken möchte. Zuallererst möchte ich Ferenc danken, dass er die Arbeit betreut hat und ich in der Gruppe arbeiten konnte. Ich habe durch das tolle Umfeld viel gelernt! Außerdem möchte ich meinem direkten Betreuer Ioachim herzlich danken. Im Rahmen der Doktorarbeit ist ein tolles Team rund um die Cavities entstanden, was wesentlich Dir zuzuschreiben ist. Danke für die Unterstützung, von der Laborarbeit bis zum Verbessern meiner Schreibkunst! Als ich angefangen habe, bestand das Team neben Ioachim nur aus Simon und Herrn Fill, der inzwischen ins Mid-IR Team gewechselt ist. Kurz darauf stieß Niko zu uns, zunächst als HiWi, dann als Masterand und inzwischen als Doktorand. Vielen Dank für die tolle Zeit! Inzwischen ist das Team um Tobi, Maxi, Christina und Stephan gewachsen. Auch euch danke ic...

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The ABCD matrix for parabolic reflectors and its application to astigmatism free four-mirror cavities

Cited by 14 publications

References 29 publications

Modal instability suppression in a high-average-power and high-finesse Fabry–Perot cavity

Modal instability suppression in a high-average-power and high-finesse Fabry–Perot cavity

International workshop on next generation gamma-ray source

Enhancement Cavities for the Generation of Extreme Ultraviolet and Hard X-Ray Radiation

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