We report a novel wedge-shaped saturable absorber structure based on commercial semiconductor-doped glasses. By use of several different semiconductor-doped glasses, fast saturable absorber passive mode locking of a Ti:Al<sub>2</sub>O<sub>3</sub> laser was demonstrated, which generated pulse durations as short as 2 ps in the 780–860-nm range. These saturable absorbers were also used to start Kerr-lens mode locking, and transform-limited 52-fs pulses were generated. Photodarkening effects in the semiconductor-doped glasses have been observed and characterized on a femtosecond time scale.
© 1999 Optical Society of America
I. P. Bilinsky, R. P. Prasankumar, and J. G. Fujimoto, "Self-starting mode locking and Kerr-lens mode locking of a Ti:Al2O3 laser by use of semiconductor-doped glass structures," J. Opt. Soc. Am. B 16, 546-549 (1999)