Influence of the concentration quenching and of water on the energy characteristics of neodymium-activated glasses

Phosphate laser glasses (review)

“…In the GLS1 silicate glass containing 2 x 10 20 cm" 3 neodymium ions, the value of £ 0 is 2.5 J/cm 3 at the same pump energy. 29 Calculations 82 show that this value of E o is due to the lower-intensity Nd 3 * absorption bands compared with the phosphate glasses. In glasses containing more than 30% BPO 4 , the population inversion and energy E o are also slightly (by ~25%) reduced due to a decrease in the intensity of the absorption bands.…”

“…However, in glasses exhibiting very marked chemical differentiation, 23 for example, in boron phosphates, as a result of the formation of ionogenic zones with enhanced activator concentration, the spacing of the rare-earth ions decreases, resulting in increased concentration quenching. 29 In ultraphosphate glasses such as NdP 5 * in these crystals. Since the concentration quenching is also substantially reduced in glasses having a similar composition and the ratio of the optical transition intensities in the glasses is similar to that observed in the crystals, it may be postulated that the structure of these glasses is similar to that of the corresponding crystals and in this case, the departure of the Nd-Nd spacings from the average will also be small.…”

“…29 from the variation of the luminescence intensity during amplification of a single pulse and from the energy increase of this pulse. Since the luminescence intensity (1) is always proportional to the level population, we have Δ£/ 0 /(Λν 0 Δ/ν).…”