Measurement of the population density of the (2)E levels of Cr+(3) in ruby via excited state absorption.
Absorption of 6328-A radiation by Cr(+3) ions in the (2)E level is used to determine the population density of this level in a ruby crystal under optical pumping. This method allows a much more accurate and simple determination of the excited state population than has been available previously.
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Rochester Institute of Technology,Physics Department, P. 0. Box 3414, Rochester, New York14614, USA.