Design and Characteristics of a Population Inversion X-ray Laser Oscillator
Abstract
Oscillators are at the heart of optical lasers, providing stable transform limited pulses. In contrast, X-ray free electron lasers use self-amplified spontaneous emission (SASE), resulting in large stochastic intensity and spectral fluctuations. Amplified spontaneous emission (ASE) of the line has been recently observed for Ne gas, Cu compounds and Mn solutions at the LCLS and SACLA X-ray free electron lasers (XFELs), using an X-ray SASE pulse as a pump to create population inversion. Here we describe the physics and realization of an X-ray laser oscillator (XLO) based on periodically pumping a Cu compound gain medium in a tunable Bragg cavity with a SASE pulse train, generating intense ( 5 x 10 ph/pulse), fully coherent, transform limited 8 keV pulses with 48 meV spectral resolution. We also discuss extending these results to other elements to operate XLO from about 5 to 12 keV, improving X-ray-based research beyond current capabilities.
Cite
@article{arxiv.1912.03554,
title = {Design and Characteristics of a Population Inversion X-ray Laser Oscillator},
author = {A. Halavanau and A. Benediktovitch and A. A. Lutman and D. DePonte and D. Cocco and N. Rohringer and U. Bergmann and C. Pellegrini},
journal= {arXiv preprint arXiv:1912.03554},
year = {2020}
}