Two-step photoconductivity in LiYxLu1 – xF4:Ce,Yb crystals

详细

Photoconductivity of LiY_xLu_1–xF₄:Ce,Yb (x = 0–1) crystals is measured under one- and two-step excitation. It is established that the photoconductivity is due to intra-center transitions from excited states of Ce³⁺ ions. The position of the ground 4 f-state of Ce³⁺ ion relative to the bottom of the conduction band is determined. The choice of pumping conditions to obtain the lasing on the 5d–4f transitions of trivalent cerium in these active media is substantiated.