Valerii V. Ter-Mikirtychev, Faculty of Engin., Kyoto Sangyo Univ., Kyoto, Japan.
Pulsed room-temperature color center lasers based on F2+ and F2- centers in crystals are presently reliable sources of tunable radiation with fundamental frequencies in the 820-1340 nm spectral region. Ever since the discovery of Cr4+:forsterite and Ti3+:sapphire lasers, the LiF:F2+* and LiF:F2- color center tunable systems have attracted the attention of researchers.
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