Estimates of population inversion for deep-UV transitions in Kr-like Y, Zr, Nb, and Mo in a high-current reflex discharge

Kevin B. Fournier; D. Stutman; Vlad Soukhanovskii; Michael Finkenthal; M. J. May; Vyacheslav N. Shlyaptsev; William H. Goldstein

doi:10.1117/12.366669

21 October 1999 Estimates of population inversion for deep-UV transitions in Kr-like Y, Zr, Nb, and Mo in a high-current reflex discharge

Kevin B. Fournier, D. Stutman, Vlad Soukhanovskii, Michael Finkenthal, M. J. May, Vyacheslav N. Shlyaptsev, William H. Goldstein

Author Affiliations +

Proceedings Volume 3776, Soft X-Ray Lasers and Applications III; (1999) https://doi.org/10.1117/12.366669
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

Kr-like ions are good candidates for FUV lasing since they can be produced in plasmas quite easily. We present results from a spectroscopic investigation of Y IV emission from a high current density, cold cathode reflex discharge. The Y II to Y V emission is recorded in the 200 - 3000 angstroms range using photometrically calibrated spectrometers, while the emission of trace aluminum ions serves for plasma diagnostics. The intensities of the Y IV 4d - 5p and 5s - 5p transitions strongly increase relative to lines from Y II and Y III with increasing plasma current. The spectra studied here are obtained at a current density of 1.75 A/cm². Experimental Y IV intensity ratios spanning several excited configurations are compared with collisional radiative predictions of the HULLAC atomic physics package. Good agreement is found for the measured and predicted ratios of 4p⁵5p to 4p⁵5s level populations per statistical weight. Finally, the response of the Kr-like system to a fast, transient excitation pulse is examined using the RADEX code. Large transient gains are predicted for several 5s - 5p transitions in Y IV, Zr V, Nb VI and Mo VII.

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Kevin B. Fournier, D. Stutman, Vlad Soukhanovskii, Michael Finkenthal, M. J. May, Vyacheslav N. Shlyaptsev, and William H. Goldstein "Estimates of population inversion for deep-UV transitions in Kr-like Y, Zr, Nb, and Mo in a high-current reflex discharge", Proc. SPIE 3776, Soft X-Ray Lasers and Applications III, (21 October 1999); https://doi.org/10.1117/12.366669

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