Abstract
Stepwise multiphoton excitation of the 4f 25d configuration of Nd 3+: YLF via intermediate levels in the 4f 3 configuration is investigated with nanosecond laser pulses. Strong UV and VUV fluorescence from the 4f 25d configuration is observed as a result of three-photon absorption of 532 nm laser pulses from a frequency doubled Nd: YAG laser. Excitation spectra from 520–536 nm show that the efficiency of the three-photon excitation of the 4f 25d configuration is maximized at 521 nm and 526 nm.
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