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17 June 1993 Interactions governing the stationary 3-um laser emission of Er-doped crystals
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Proceedings Volume 1864, Solid State Lasers IV; (1993)
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States
The characteristics of energy processes in concentrated Er3+ system and their effects on the stationary three micron laser emission are discussed. It is shown that in certain conditions, valid for a broad range of concentrations, the laser equations could be solved analytically, the solution allowing to study the influence of various parameters on the laser emission. This revealed that a crucial role in determining a positive pump effect is played by a figure of merit that depends on the ratios of up-conversion rates from 4I11/2 and 4I13/2 levels and of the fractional thermal populations for the crystal field components involved in emission. In given pump conditions, the restrictions imposed on the figure of merit limit the emission wavelength range and the efficiency. The emission in Er3+ systems co-doped with Cr3+ is also discussed. Cr3+ co- doping not only improves the pump efficiency, but modifies the whole chain of energy transfer processes, leading to the extension of the laser wavelength range.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Voicu Lupei, Serban Georgescu, Aurelia Lupei, Ioan Ursu, and Mihai P. Dinca "Interactions governing the stationary 3-um laser emission of Er-doped crystals", Proc. SPIE 1864, Solid State Lasers IV, (17 June 1993);

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