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Optics Communications

Visible superradiance of excited F2 colour centres in LiF single crystals

Tadeusz Kuliński, Franciszek K. Kaczmarek

Published Jan 1, 1979• 11 citations
Publisher
DOI
10.1016/0030-4018(79)90178-0

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Applied Physics Letters•Oct 8, 2001•8 citations
The polarised two-photon (IR) and one-photon (visible) luminescence excitation spectra of Nd 3+ nanoclusters in CaF 2 and SrF 2 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 4 I 9/2 → 4 G 5/2 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.
Luminescence and absorption spectra of LiF crystals with F2− color centers (CCs) were studied in the 14–300 K temperature range. The Huang–Rhys factors measured from absorption and emission spectra were equal in magnitude and calculated to be 3.2 and 2.72 at 77 and 300 K, respectively. It was shown that below 40 K inhomogeneous broadening of the zero phonon line of the F2− CC prevails over homogeneous broadening. Inhomogeneous broadening of the zero phonon line was observed to vary from 5 to 15 cm−1 for different crystal preparations. Persistent spectral hole burning stable at room temperature was realized in LiF:F2− crystals.