Abstract
Optical gain on the 476.5 nm Ar II 4p−4s ion laser transition has been observed in argon-gas excited by 2.5 ns pulses of 90 MeV32S ions with a repetition rate of 4883 Hz. The energy per pulse was 23 μJ. The projectiles were stopped in the target at pressures between 5 and 20 kPa. Gain was determined from a measured transient increase of the intensity of a 476.5 nm probe laser beam sent along the ion beam axis and back reflected by an aluminum foil. The maximum gain observed was (0.4±0.1)×10−3 at a target-gas pressure of 5 kPa. Control experiments using krypton as target-gas were performed and yielded a null result. The optical gain observed in argon is consistent with the result from an analysis of spectroscopic studies of rare-gas targets excited by heavy ion beams.
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Dedicated to Prof. Dr. P. Kienle on the occasion of his 60th birthday. This work has been funded by the German Federal Ministry for Research and Technology (BMFT) under contract No. 06 TM 310 I, Gesellschaft für Schwerionenforschung (GSI), Darmstadt, and the Tandem accelerator laboratory, Munich
The authors thank the technicians at the accelerator for providing the intense ion beam and Mr. M. Münich and H. Hagn for lending us the 350 MHz filter.
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Ulrich, A., Wieser, J., Pfaffenberger, R. et al. Optical gain on the 476.5 nm Argon-ion laser line in a gas-target excited by a heavy ion beam. Z. Physik A - Hadrons and Nuclei 341, 111–115 (1991). https://doi.org/10.1007/BF01281282
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DOI: https://doi.org/10.1007/BF01281282