Nickles, P. V., authorSandner, W., authorShlyaptsev, V. N., authorKalachnikov, M. P., authorBortolotto, F., authorRocca, Jorge J., authorJanulewicz, K. A., authorAmerican Physical Society, publisher2007-01-032007-01-032001Janulewicz, K. A., et al., Demonstration of a Hybrid Collisional Soft-X-Ray Laser, Physical Review. A 63, no. 3 (September 2001): 033803-1-033803-5.http://hdl.handle.net/10217/67494We report on a demonstration of x-ray-ultraviolet amplification following collisional excitation in a discharge-created plasma waveguide irradiated by a picosecond optical laser pulse. A capillary discharge was used to generate a sulfur plasma column with a large concentration of Ne-like ions and a radially concave electron density profile. The intense short laser pulse rapidly heated the electrons, producing amplification in the 3p 1S0-3s 1P1 transition of Ne-like S at 60.8 nm. The integrated gain-length product obtained exciting a 3-cm-long capillary with a 0.46-J short laser pulse is 6.8. The beam divergence was observed to decrease as a function of plasma column length, reaching 2.5 mrad for 30-mm-long capillaries. This hybrid laser pumping scheme could lead to a new generation of efficient tabletop soft-x-ray lasers.born digitalarticleseng©2001 American Physical Society.Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.Text