Developments of Optical Resonators and Optical Recirculators for Compton X/γ Ray Machines
Abstract
Optical resonators and optical recirculators are key elements of Compton X/γ ray machines. With regard to their use in laser physics or in time-frequency metrology, these devices have to obey severe constraints when implemented in the vaccum of an electron accelerator. Our group has developed both types of devices. In this proceedings an original recirculator design, that was developed within the European proposal to the ELI-NP γ ray source call for tender, is described. This is an aberration free device which allows reciculating 32 times a short and high intensity laser pulse. It also allows synchronizing each of the 32 passes with the electron RF cavities within 100 fs. The second topic of these proceedings is a description of our R & D on optical resonators dedicated to laser-electron interactions. We have locked two different picosecond laser oscillators to the highest cavity finesse F=30000 ever reached in pulsed regime. We also designed and build a new kind of non-planar cavity, tetrahedron shape, providing circularly polarized eigen modes. This cavity was installed in the ATF accelerator of KEK and successfully used to produce a high gamma ray flux. Thanks to an original fibre amplifier, we succeed in stacking 100 kW of average power inside the cavity.
- Publication:
-
Nuclear Physics and Gamma-Ray Sources for Nuclear Security and Nonproliferation - Proceedings of the International Symposium. Edited by HAYAKAWA TAKEHITO ET AL. Published by World Scientific Publishing Co. Pte. Ltd
- Pub Date:
- October 2015
- DOI:
- 10.1142/9789814635455_0013
- Bibcode:
- 2015npgr.conf..107M