By Majid Ebrahim-Zadeh, Irina T. Sorokina
Result of the NATO complex study Workshop on center Infrared Coherent assets (MICS) 2005, Barcelona, Spain, 6-11 November 2005.
Read Online or Download Mid-Infrared Coherent Sources and Applications (NATO Science for Peace and Security Series B: Physics and Biophysics) PDF
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Additional info for Mid-Infrared Coherent Sources and Applications (NATO Science for Peace and Security Series B: Physics and Biophysics)
Sample text
The feasibility of exciting stimulated emission on f-f transitions of RE3+ ions is most often reduced to the estimate of luminescence quantum yield for steadystate excitation. From the 1970’s until now comparatively simple semi-empirical methods for determination of the most important intensity characteristics of NEW MONOCRYSTALS WITH LOW PHONON ENERGY 21 intermanifold j → i radiative transitions of RE3+ ions in laser crystals have been developed and tested. The most important of these characteristics are the probability of spontaneous emission A ji and the probability of nonradiative transition W ji .
By equating ed,exp experimental and calculated oscillator strengths, f i,ed,calc = f i, j , and solvj ing the obtained set of equations for the intensity parameters t by the least square method, one can find the values of t . These parameters for RE:MPb2 Hal5 crystals are given in TABLE 9. With intensity parameters from TABLE 9, the theoretical oscillator strengths for the absorption bands f ied,calc were calculated for Nd [74] and Er [77] ions in j KPC matrix, and they are listed in TABLES 10 and 11 accordingly.
079:004. 013. 4 µ s, and for 4 F3/2 level 340 µs [50]. This means that the 4 F5/2 level in KPC host is practically quenched via multiphonon relaxation, the rate for the 4 F5/2 → 4 F3/2 multiphonon transition was estimated to be WNR = 3 × 105 s−1 (TABLE 13). In Nd-doped KPB and RPB crystals, there are intense emissions not only from 4 F3/2 level, but also from the 4 F5/2 level, under selective direct excitation at λexc = 821 nm into 4 F5/2 level [81]. That follows from comparison of fragments of emission spectra of Nd-doped KPC (Figure 19, curve 1) and KPB 42 LUDMILA ISAENKO ET AL.
