Abstract
We report the first observation of amplification of spontaneous emission at soft x-ray wavelengths by ions in the nickel-like sequence. The ions are created by high-intensity laser irradiation of a thin foil. Gains of order 1 are observed on J=0-1, 4d-4p transitions in at 65.83 and 71.00 Å. There is some evidence for amplification on the analogous lines at 50.26 and 56.09 Å in . The pumping mechanism is believed to be electron collisional excitation from the ground state. The scheme should be readily scalable to produce amplification in at 43.15 Å.
- Received 10 August 1987
DOI:https://doi.org/10.1103/PhysRevLett.59.2157
©1987 American Physical Society