Broadly tunable laser using some mixed centers in an LiF crystal for the 520–720 nm band

Combined excitation‐emission spectroscopy of colour centres in lithium fluoride crystals

“…Its spectral parameters correspond with those obtained in a previous paper regarding electron irradiated LiF crystals [13]. This band, tentatively attributed to the presence of impurities, like oxygen and magnesium, inside the crystal [11], proved to be very important because it has been used to obtain a yellow-orange laser emission at room temperature [14,15]. Measurements made on other irradiated LiF crystals demonstrate that the emission intensity of F 2 p centres grows proportionally with the concentration of F 2 centres.…”