Nearly four decades ago H-like and He-like resonantly photo-pumped laser schemes were proposed for producing X-ray
lasers. However, demonstrating these schemes in the laboratory has proved to be elusive because of the difficulty of
finding a strong resonant pump line. With the advent of the X-ray free electron laser (X-FEL) at the SLAC Linac
Coherent Light Source (LCLS) we now have a tunable X-ray laser source that can be used to replace the pump line in
previously proposed laser schemes and allow researchers to study the physics and feasibility of resonantly photo-pumped
laser schemes. In this paper we use the X-FEL at 1174 eV to photo-pump the singly excited 1s2p state of Helike
Ne to the doubly excited 2p3p state and model gain on the 2p3p-2p2s transition at 175 eV and the 2p3p-1s3p
transition at 1017 eV. One motivation for studying this scheme is to explore possible quenching of the gain due to strong
non-linear coupling effects from the intense X-FEL beam. We compare this scheme with photo-pumping the He-like Ne
ground state to the 1s3p singly excited state followed by lasing on the 3p-2s and 3d-2p transitions at 158 and 151 eV.
Experiments are being planned at LCLS to study these laser processes and coherent quantum effects.
Focusing an x-ray free electron laser (XFEL) pulse into a gas target, a plasma of transiently core excited ions can
be created within a few fs, building a pathway to an inner-shell keV x-ray laser. Varying the XFEL parameters, a
wide variety of pulse structures can be created with comparable peak-intensities to XFELs: isolated pulses of subfs
duration, trains of pulses with increased temporal coherence, and trains of fs pulses of different wavelengths.
We present self-consistent gain and amplification calculations, tailored to predict first experiments on lasing in
neon pumped by the Linac Coherent Light Source at Stanford.
Conference Committee Involvement (2)
X-Ray Free-Electron Lasers: Beam Diagnostics, Beamline Instrumentation, and Applications II
18 August 2014 | San Diego, California, United States
X-Ray Free-Electron Lasers: Beam Diagnostics, Beamline Instrumentation, and Applications
14 August 2012 | San Diego, California, United States