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- W173653504 abstract "This talk was divided into two independent parts: 1)New Non-Linear LaBGeO5 Crystals for Self-frequency Doubled Lasers Intensive spectral investigations have been carried out on trigonal3+ LaBGeO5 crystals. Studies were performed on crystals doped with Nd and Pr3+;the pure crystal was also studied. Absorption and luminescence spectra were studied to determine the Stark levels of the activator ions. Luminescence intensity characteristics and pulse stimulated emission parameters were studied for the Nd3+ ions at two intermanifold channels ( 4F3/2→4I11/2And4F3/2→4I13/2), and for the Pr3+ ions at the visible 3Po→3Hb transition. The Raman spectra and non-linear optical properties (including second harmonic generation) were also investigated. A preliminary theoretical analysis of the crystal fields at the activator ion sites has been carried out using a new many-electron semiempirical method, and all the observed transitions have been identified using this technique. From the studies we deduce that LaBGe0 5: Nd3+ is a promising material for designing a self-frequency doubled laser.2)Techniques for improving the effectiveness of crystalline lasers. We present two techniques to improve crystalline lasers. The first: in this lecture we shall discuss spectroscopic laser properties and the peculiarities of crystal containing fluorine and oxygen in adisordered structure. A discussion of the historical background will include the laws of crystal-field disorderness of Ln-activators (static and dynamic structural disorderness), the nature of the multicentricity,and the results of a search for new Ln3+laser crystals. Examples of disordered crystals with Nd3+ions will be given and compared to neodymium laser glasses. Perspectives shall be presented using disordered crystals in lasers, with laser-diode pumping, and in amplifiers of powerful laser machines. The second: at the present time lamp-pumped stimulated-emission excitation processes of laser crystals containing Ln3+ions rely on the populated Stark levels of the ground state of the activator. In a number of cases this method makes it difficult to obtain effective laser action in the system. A new ground-state lifting method can increase the absorption capability of the lasing crystals, and thus improve the laser action. In this lecture we shall discuss the physical basis of this technique, and possible applications of the technique to fluorine-and oxygen-containing crystals doped with Pr3+ions." @default.
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- W173653504 date "1992-01-01" @default.
- W173653504 modified "2023-09-27" @default.
- W173653504 title "New Crystals for Laser Applications" @default.
- W173653504 doi "https://doi.org/10.1007/978-1-4615-3044-2_18" @default.
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