In a Nd-glass microspherical cavity the spontaneous enhancement and inhibition emission processes have been observed in the optical region. The rate of the enhanced spontaneous emission is larger than the free-space values for some transitions, so that some lasing lines of Nd-ion in glass have been observed, since the large enhancements of the transition rates may modify the decay processes in the multilevel system of the Nd-glass medium. A simple theoretical discussion is given to explain the possible mechanism of the lasing in the 740 nm and 810 nm wavelength regions. The micropherical cavity laser may be used in studies of Nd- glass microcavity spectroscopy and nonlinear optics.
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