Description: Trace levels of lithium are detected on 100 ..mu..sec timescales using an electrooptically tuned cw dye laser, in conjunction with a high resolution 0.03 A spectrometer/optical multichannel analyzer. The spectra of Li/sup 7/ resonance lines at 6708 A are analyzed for their Zeeman splitting patterns, after unfolding the effects of intracavity absorption (ICA) on the lineshape. For these timescales, a sensitivity to approx.1 x 10/sup 7/ lithium atoms/cc at a level of ..delta..I/I approx.10% has been observed, corresponding to enhancement factors over single pass absorption of approx.1000X. Intracavity enhancement of the line structure in the wings of the line, and a weak blue shift asymmetry have also been observed, but always in the presence of a central absorption feature. The 0.1 A instantaneous laser linewidth is usually scanned over a 1 A range, at frequencies up to 30 kHz. Ultimately this detection system will enclose a hot, dense fusion plasma ... intersecting an 80 keV, 10 mA neutral lithium beam to probe the plasma internal magnetic field structure, in a non-intrusive fashion.
Date: January 1, 1985
Creator: Wurden, G.A.
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