Abstract
The polarised two-photon (IR) and one-photon (visible) luminescence excitation spectra of Nd3+ nanoclusters in CaF2 and SrF2 crystals are measured at 10 K using a :LiF colour centre laser tunable in spectral ranges 1090 — 1230 nm and 545 — 615 nm with an emission linewidth of ~0.02 — 0.03 cm-1, an average output power of ~55 mW, and a pulse repetition rate of 10 Hz. The two-photon excitation spectra at the 4I9/2 → 4G5/2 transition reveal the structure, which is absent upon one-photon excitation, which can be explained by different selection rules for some Stark — Stark transitions upon one- and two-photon absorption.
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