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Polarization-selectable cavity locking method for generation of laser Compton scattered $$gamma$$-rays

Kosuge, Atsushi ; Mori, Michiaki; Okada, Hajime; Hajima, Ryoichi; Nagashima, Keisuke

Nowadays, generation of energy-tunable, monochromatic $$gamma$$-rays is needed to establish a nondestructive assay method of nuclear fuel materials. The $$gamma$$-rays are generated by collision of laser photons stored in a cavity and relativistic electrons. We propose a configuration of an enhancement cavity capable of performing polarization control fabricated by a combination of a four-mirror ring cavity with a small spot inside a cavity and a three-mirror of reflective optics as an image inverter for polarization-selectable $$gamma$$-rays. The image inverter introduces a phase shift of specific polarization which can be used to generate an error signal to lock an optical cavity at a resonance condition.

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