Novel optical materials/structure and applications (3)

[ALPS8-04] The impact of Er/Tm impurities in Yb:YLF on anti-Stokes fluorescence cooling

*Stefan Pueschel¹, Christian Kränkel¹, Hiroki Tanaka¹ (1. Leibniz Institut für Kristallzüchtung (IKZ))

Energy transfer processes from Yb³⁺ to Er³⁺ and Tm³⁺ in YLF are investigated to quantify their influence on anti-Stokes fluorescence cooling. We revealed that Er³⁺ causes a significant intensity dependence on the laser cooling efficiency.