It was demonstrated that the amount of Ce3+ ions in centers with luminescence in the shorter wavelength region decreases and with luminescence in the longer wavelength increases upon transition from LiSrAlF6 to the LiCaAlF6 matrix. In this case, the longer wavelength edge of the excitation band corresponds to the luminescence of longer wave centers in the LiCaAlF6 matrix, while the opposite is observed for the LiSrAlF6 matrix. The picture also changes with an increase in the concentration of Ce3+ ions, namely, an increase in the luminescence intensity of longer-wave centers is observed; It is shown that mixed crystals at a low concentration of Ce3+ ions are characterized by a higher gain. In this case, the effect of the formation of color centers and induced absorption appears for LiSrAlF6 crystals and mixed LiSrxCa1-xAlF6 with an increase in the concentration of Ce3+ ions.
In the present work prototype of laser gas analyzer of differential absorption technique on the basis of pulsed tunable Ce:LiCaAlF6 laser is discussed. By means of wavelength tuning concentrations of NO2, SO2 and O3 in the atmosphere of Kazan city were measured. The measured detection threshold appeared to be 2,52·10-6 g/m3 for NO2, 0,30·10-6 g/m3 for SO2, 0,03·10-6 g/m3 for O3.
The preliminary data of studying optical gain properties of active media using the open aperture z-scan technique without an additional probe beam are demonstrated. The prospects of evaluating pump induced photodynamic processes parameters in UV solid-state active media on the pumping and lasing wavelengths: excited-state absorption and photoionization cross-sections of active ions, effective absorption and ionization cross-sections of color centers and recombination rates are discussed.
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