Neodymium Random Lasers: Experimental Studies of Stimulated Emission

E. I. Galant, Yu. N. Kondrat’ev, Alexander K. Przhevuskii +3 more

Nikolai N Il'ichev, A. A. Maliutin, O. V. Skoptsov

V. M. Podgoretskii, A. N. Chernets

E. I. Galant, Valery N Kalinin, Sergei G. Lunter +5 more

A calculation is reported of the energy parameters of stimulated emission of λ = 1.54 μ. radiation from glasses activated with Yb 3+ and Er 3+ ions and pumped with neodymium laser radiation. The calculation allows for the influence of the induced absorption at the pump wavelength and for the quenching of the excited levels of the Yb 3+ and Er 3+ ions. The kinetics and magnitude of the induced absorption are investigated for glasses of various compositions containing Yb 3+ and Er 3+ . The calculated values of the energy parameters are compared with the experimental results. Some features of the stimulated emission spectra of erbium-activated phosphate glasses are considered.

Aleksander A. Makovetskii, R. P. Tishchenko

An analysis is made of the problem of kinetics of the superradiance decay in the case of nonlinear quenching of excited centers in four-level active media. A method is proposed for estimating the initial axial gain and of the stimulated emission cross sections of active media: it is based on a simultaneous analysis of the normalized superradiant flux and integrated population of the active medium. The proposed method is not sensitive to nonlinear quenching. A qualitative analysis is made of the decay of excitation in neodymium pentaphosphate crystals after pulsed excitation with laser radiation of the 0.538 μ wavelength and stimulated emission cross sections are estimated for the 4 F 3/2 → 4 I 11/2 transition in Nd 3+ resulting in lasing at 1.051 μ and at some other wavelengths of this transition.

Sergey V. Gaponenko, Hilmi Volkan Demir