Color Centers Transient Absorption and Ultra-short Pulse Lasing from LiLu 0.7 Y 0.3 F 4 :Ce 3+ Active Medium

We have obtained the single pulse laser oscillation with 400±10 ps pulse duration at 311 nm from LiLu0.7Y0.3F4:Ce3+ crystal due to passive Q-switch by means of pump induced color centers absorption. In this work we discuss the role of intrinsic transient color centers on losses dynamics.