Er:YAG 2.94-µm lasers and Er:YLF 2.81-µm lasers were actively mode locked, with TeO2 as the acousto-optic modulator. The Er:YLF crystal generated shorter and more stable pulses, whereas the Er:YAG had a higher slope efficiency of 0.8% in free-running operation. Mode-locked pulse durations of < 700 ps were obtained with Er: YLF by applying 4 W of electrical driving power to the LiNbO3 transducer.
© 1992 Optical Society of America
H. J. Eichler, J. Albertz, F. Below, A. Kummrow, T. Leitert, A. A. Kaminskii, and L. Jakab, "Acousto-optic mode locking of 3-µm Er lasers," Appl. Opt. 31, 4909-4911 (1992)