Two-photon absorption of F–2 color centers in LiF crystal at 1906 nm

✍ Scribed by V. V. Fedorov; A. V. Fedorov; D. Martyshkin; J. F. Donegan; S. B. Mirov

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 152 KB
• Volume: 1
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.200410043

✦ Synopsis

We report room-temperature two-photon induced
fluorescence of the F~2~
^-^ color centers in LiF crystal in
the ∼960-1300 nm spectral range. The fluorescence spectra and
kinetics were measured using the first (1.906 μm) and second
harmonics (0.953 μm) of a H~2~–Raman Shifted single
frequency Nd:YAG laser. The fluorescence spectra and kinetics
under two-photon (1.906 μm) and one-photon (0.953 μm)
excitation were identical. A nonlinear dependence of the
fluorescence intensity versus excitation energy of 1.906 μm
radiation was demonstrated. The two-photon absorption cross
section of F~2~
^-^ color center was measured to be (0.9±
0.4) × 10^-49^ cm^4^ sec at 1.906 μ m.