Polarization induced instabilities in external four-mirror Fabry-Perot cavities

Zomer, F.; Fedala, Y.; Pavloff, Nicolas; Soskov, V.; Variola, A.

doi:10.1364/ao.48.006651

Cited by 41 publications

(35 citation statements)

References 29 publications

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“…When the laser beam incidence corresponds to the designed incident angle of the coatings, the s and p waves are dephased by π and their reflection coefficients for the amplitude differ. However, with such coatings, and assuming stress-free mirror mounts, polarization ellipticity can be induced by angular misalignments [47] and by the very small birefringence that is currently measured in multilayer dielectric coatings [48].…”

Section: Laser and γ-Ray Beam Polarizationsmentioning

confidence: 99%

See 1 more Smart Citation

Design and optimization of a highly efficient optical multipass system forγ-ray beam production from electron laser beam Compton scattering

Dupraz

Cassou

Delerue

et al. 2014

Phys. Rev. ST Accel. Beams

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A new kind of nonresonant optical recirculator, dedicated to the production of γ rays by means of Compton backscattering, is described. This novel instrument, inspired by optical multipass systems, has its design focused on high flux and very small spectral bandwidth of the γ-ray beam. It has been developed to fulfill the project specifications of the European Extreme Light Infrastructure "Nuclear Pillar," i.e., the Gamma Beam System. Our system allows a single high power laser pulse to recirculate 32 times synchronized on the radio frequency driving accelerating cavities for the electron beam. Namely, the polarization of the laser beam and crossing angle between laser and electrons are preserved all along the 32 passes. Moreover, optical aberrations are kept at a negligible level. The general tools developed for designing, optimizing, and aligning the system are described. A detailed simulation demonstrates the high efficiency of the device.

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Section: Laser and γ-Ray Beam Polarizationsmentioning

confidence: 99%

“…We have computed the polarization transport in the recirculator taking into account its nonplanar geometry as described in [47]. We considered SiO 2 =Ta 2 O 5 multilayer coatings with a transmittance of ≈500 ppm (corresponding to 11 double layers) and we use the formalism of [49] to model it.…”

Section: Laser and γ-Ray Beam Polarizationsmentioning

confidence: 99%

Design and optimization of a highly efficient optical multipass system forγ-ray beam production from electron laser beam Compton scattering

Dupraz

Cassou

Delerue

et al. 2014

Phys. Rev. ST Accel. Beams

View full text Add to dashboard Cite

show abstract

“…The four mirrors resonator is mechanically stable, especially when small laser waist is foreseen. In the case where the ratio between the height of the cavity and its length becomes small, a planar 2D cavity can be chosen instead of a 3D cavity [18]. Moreover, to further reduce the horizontal aperture of the vacuum chamber in order to conserve a small interaction angle, we chose the 2D crossed geometry (see fig.…”

Section: Accelerator-laser Systemmentioning

confidence: 99%

ThomX: A high flux compact X ray source

Bruni

Artemiev

Roux

et al. 2011

UVX 2010 - 10e Colloque Sur Les Sources Cohérentes Et Incohérentes UV, VUV Et X ; Applications Et Développements Récents

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Abstract. In the field of application of X-rays, there is a strong need for high brightness, tunable beam. The synchrotron radiation sources meet this demand, but the access time is limited, and they are large and expensive facilities. In this framework, we develop a compact monochromatic high flux X-ray source. The principle lies in obtaining X-ray by Compton backscattering of photons by relativistic electrons. This facility is relatively compact (about 70 m 2 ) to be installed directly in a scientific laboratory, a hospital or an art museum. The backscattered photons are in the range of multi-keV energy, determined by the energy of the electrons and photons. Since there is a correlation between emission angle and energy of scattered photons, the spectral bandwidth of scattered photons can be controlled by simple collimation. The paper presents the ThomX X-ray source consisting of a 50 MeV small storage ring and a laser coupled to a high gain Fabry Perot cavity.

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“…The two-mirror cavities made of one concave reflector do not exhibit a very small beam-waist between the two mirrors, the small beam-waist is instead located on the flat mirror and thus cannot be used to some applications. These remarks rule out twomirror cavities [9]. Three-mirror cavities either consisting of three concave or two concave and one flat reflective surfaces can thus be considered.…”

Section: Introductionmentioning

confidence: 99%