W. Lenth, R. M. MacFarlane, and A. J. Silversmith
The advent of powerful near infrared GaAlAs diode lasers has stimulated interest in the development of visible laser sources that are pumped by semiconductor diode lasers. One approach uses intra-cavity second harmonic generation in Nd3+ lasers pumped by high-power GaAlAs diode lasers. We have recently demonstrated another approach, that of laser-pumped upconversion lasers where nonlinear pumping excites green laser emission using two-step absorption or cooperative energy transfer.
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