TY - CHAP AU - Tkachuk, A. M. AU - Razumova, I. K. AU - Mirzaeva, A. A. AU - Novikov, G. E. AU - Orlov2, O. A. AU - Malyshev, Andrey AU - Gapontsev, V. P. PY - 2002 DO - 10.1117/12.475342 SN - 0-8194-4533-9 UR - https://hdl.handle.net/20.500.14352/61007 AB - Steady-state population of 7 lowest excited erbium. levels in LiY¬¬_(1-x)Er_xF_4 (YLF:Er^(3+) (x=0.003-1) crystals was studied under upconversion. CW InGaAs laser-diode pumping with varied power density. Theoretical and experimental concentration and... LA - eng PB - Spie-Int Soc Optical Engineering KW - Solid-state lasers KW - Energy transfer KW - Upconversion KW - Laser-diode pumping TI - Population of higher-energy levels in LiY_(1-x)Er_xF_4 (x=O.003 ÷1) crystals under CW IR laser-diode pumping TY - book part ER -