We demonstrate a regenerative amplifier incorporating alexandrite as the gain medium that is pumped by an alexandrite laser. Temperature-altered gain permitted the 728-nm alexandrite pump laser, operating at room temperature, to pump a 780–800-nm alexandrite laser that was maintained at elevated temperatures. 200-fs pulses from a Ti:sapphire oscillator were amplified to the millijoule level. This system also amplified femtosecond pulses from a frequency-doubled Er-doped fiber laser.
© 1996 Optical Society of America
Original Manuscript: September 7, 1995
Published: January 15, 1996
A. Hariharan, Jeff Squier, M. E. Fermann, M. L. Stock, and D. J. Harter, "Alexandrite-pumped alexandrite regenerative amplifier for femtosecond pulse amplification," Opt. Lett. 21, 128-130 (1996)