The controlled coupling of a laser to plasma has the potential to address grand scientific
challenges,,,,–, but many applications have limited flexibility and poor control over the laser …

Transverse interferometric measurements are presented of the plasma channel formed in a
hydrogen-filled capillary discharge waveguide recently used to generate 1 GeV electrons in …

We present an in-depth analysis of De Laval nozzles, which are ideal for gas jet generation
in a wide variety of experiments. Scaling behavior of parameters especially relevant to laser …

We report the development of corrugated “slow-wave “plasma guiding structures with
application to quasiphase-matched direct laser acceleration of charged particles and …

We demonstrate through experiments and numerical simulations that low-density, low-loss,
meter-scale plasma channels can be generated by employing a conditioning laser pulse to …

An advanced focusing scheme, called a “flying focus,” uses a chromatic focusing system
combined with a broadband laser pulse with its colors arranged in time to propagate a high …

A hydrogen-filled capillary discharge waveguide operating at kHz repetition rates is
presented for parameters relevant to laser plasma acceleration (LPA). The discharge current …

Dramatic enhancement of optical-field-ionization collisional-excitation x-ray lasing is
achieved by using an optically preformed plasma waveguide. With a 9-mm-long pure …

We measured the parameter reproducibility and radial electron density profile of capillary
discharge waveguides with diameters of 650%. These variations explain only a small …

We report average powers exceeding 1 microwatt in laser transitions of Ne-like ions at
wavelengths near 30 nm. Gain-saturated operation was obtained at a repetition rate of 5 Hz …