Mechanical stress in dielectric mirrors: towards a fine control of the flatness

Bégou, Thomas; Lumeau, Julien

doi:10.1117/12.2296090

Cited by 1 publication

(2 citation statements)

References 7 publications

(8 reference statements)

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“…It has been shown that systematic macro- scopic surface error on the MPS mirror significantly limits the LBC performances [30]. In the pursue of reducing this defect, Institut Fresnel developped a process [40] to compensate for the coating stress and also to randomize the focus surface errors corresponding to the Zernike coefficient Z 0 2 in the Zernike decomposition of the mirror surface [39]. Each substrate has been controlled with NewView Zygo TM 7300 [41].…”

Section: Mirror Pair Systemmentioning

confidence: 99%

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Low power commissioning of an innovative laser beam circulator for inverse Compton scattering γ -ray source

Ndiaye¹,

Cassou²,

Cornebise³

et al. 2019

Phys. Rev. Accel. Beams

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We report on the optical commissioning of the high power laser beam circulator (LBC) for the high brightness Compton γ-ray source Extreme Light Infrastructure for Nuclear Physics. Tests aiming at demonstrating the optical performances of the LBC have been realized with a low-power pulsed laser-beam system and without electron beam. We show that, with the developed alignment and synchronization methods coming from the LBC design study presented in the Dupraz et al. paper [1], the LBC enhances the laser-beam power available at the interaction point (IP) by a factor in excess of 25. This corresponds to a potential of bringing the average laser-beam power in excess of 1 kW when the LBC is injected with the interaction point laser-beam pulse energy of 400 mJ at 100 Hz.

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Section: Mirror Pair Systemmentioning

confidence: 99%

“…Each substrate has been controlled with NewView Zygo TM 7300 [41]. The back-coating compensation is then calculated after calibration studies have been made [40]. The mirrors have been coated with a Leyblod TM Optics Helios [42,43] at Institut Fresnel.…”

Section: Mirror Pair Systemmentioning

confidence: 99%