Z-scan technique to study gain properties and pump-induced processes in Ce:LiCAF UV active medium

© 2018 SPIE. 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

Luminescence kinetics of an Y0.8Yb0.2F3:Tm3+ solid solution crystal

© 2014, Pleiades Publishing, Inc. Upconversion luminescence kinetics of Tm3+ doped Y0.8Yb0.2F3 solid solution crystal was studied for various values of pulse excitation parameters: pulse duration, wavelength and excitation power. Analysis of obtained results allowed a conclusion about the presence of transient processes. The transient processes found in upconversion luminescence kinetics are characterized by duration commensurate with lifetime of the excited energy levels of the activator ions. Upon completion of these processes a stable equilibrium state is established between the processes of population and spontaneous decay of the excited energy levels of Tm3+ ions. Conditions under which the equilibrium state can be maintained have been considered

Laser-like effects and upconversion fluorescence temporal dynamic in Tm3+, Yb3+ doped YF3 single crystals

© Published under licence by IOP Publishing Ltd. A new way of managing fluorescence features in doped bulk and nanosized materials by variation of excitation temporal characteristics is demonstrated. Random laser-like effect on 3H4-3F4 transitions of Tm3+ ions in Yb,Tm:YF3 single crystal was revealed under rectangular pulse train excitation in 930-980 spectral domain

Analysis of nonlinear optical materials properties by simple powder technique

© Published under licence by IOP Publishing Ltd. The article describes a simple technique for comparative analysis of the second harmonic generation properties of new samples and etalon materials by their powders. The effectiveness of the method was tested and and measuring of nonlinear coefficient and damage threshold of the well known materials: KDP, LiIO3, m-nitroaniline was demonstrated. The parameters of the new promising nonlinear material DNPAP were measured

Dynamics of the UV-Induced Absorption of Laser Light by Color Centers in Crystalline KY3F10:Ce3+,Yb3+

© 2014, Springer Science+Business Media New York. A pump-probe method is used to study the dynamics of the destruction of color centers in KY3F10:Ce3+ and KY3F10:Ce3+,Yb3+ crystals by continuous UV radiation and to measure its parameters. The effect of Yb3+ ions in crystalline KY3F10:Ce3+,Yb3+ on the rate of bleaching of color centers in it under exposure to the probe light is studied. Irradiation of KY3F10:Ce3+ and KY3F10:Ce3+,Yb3+ crystals at a wavelength corresponding to an absorption band of a color center accelerates the destruction of the color centers and the reduction of Yb2+ ions to the trivalent state in proportion to the density of the radiation. A model is constructed for the bleaching mechanism that can be used to estimate the ionization cross section of the color centers

Z-scan technique to study gain properties and pump-induced processes in Ce:LiCAF UV active medium

© 2018 SPIE. 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

Luminescence kinetics of an Y0.8Yb0.2F3:Tm3+ solid solution crystal

© 2014, Pleiades Publishing, Inc. Upconversion luminescence kinetics of Tm3+ doped Y0.8Yb0.2F3 solid solution crystal was studied for various values of pulse excitation parameters: pulse duration, wavelength and excitation power. Analysis of obtained results allowed a conclusion about the presence of transient processes. The transient processes found in upconversion luminescence kinetics are characterized by duration commensurate with lifetime of the excited energy levels of the activator ions. Upon completion of these processes a stable equilibrium state is established between the processes of population and spontaneous decay of the excited energy levels of Tm3+ ions. Conditions under which the equilibrium state can be maintained have been considered

Up-conversion luminescence of LaF3:Pr3+ crystal

© Published under licence by IOP Publishing Ltd. LaF3:Pr3+ crystal is proposed as a promising media for an infrared quantum counter in the mid-infrared spectrum range. In this paper it has been shown that this crystal can work as an infrared quantum counter in the range of spectra of about 3 μm at the temperatures 170 K and 210 K with the efficiency of about 5%

Analysis of nonlinear optical materials properties by simple powder technique

© Published under licence by IOP Publishing Ltd. The article describes a simple technique for comparative analysis of the second harmonic generation properties of new samples and etalon materials by their powders. The effectiveness of the method was tested and and measuring of nonlinear coefficient and damage threshold of the well known materials: KDP, LiIO3, m-nitroaniline was demonstrated. The parameters of the new promising nonlinear material DNPAP were measured

Luminescence kinetics of an Y0.8Yb0.2F3:Tm3+ solid solution crystal

© 2014, Pleiades Publishing, Inc. Upconversion luminescence kinetics of Tm3+ doped Y0.8Yb0.2F3 solid solution crystal was studied for various values of pulse excitation parameters: pulse duration, wavelength and excitation power. Analysis of obtained results allowed a conclusion about the presence of transient processes. The transient processes found in upconversion luminescence kinetics are characterized by duration commensurate with lifetime of the excited energy levels of the activator ions. Upon completion of these processes a stable equilibrium state is established between the processes of population and spontaneous decay of the excited energy levels of Tm3+ ions. Conditions under which the equilibrium state can be maintained have been considered