A long-wavelength injection method is proposed that will yield a broad amplified spectrum in a femtosecond terawatt Ti:sapphire laser. By injecting a seed pulse on the red side of the gain peak and amplifying it to a saturated fluence level, we could significantly compensate for the spectral narrowing that is due to the gain-narrowing effect by use of the amplifying characteristics of a positively chirped pulse in a gain-saturated regime, and 20-fs, 3-TW pulses could be demonstrated from a Ti:sapphire laser with two multipass amplifiers.
© 1999 Optical Society of America
(140.3280) Lasers and laser optics : Laser amplifiers
(140.3590) Lasers and laser optics : Lasers, titanium
(140.7090) Lasers and laser optics : Ultrafast lasers
(320.1590) Ultrafast optics : Chirping
Yong Ho Cha, Young Il Kang, and Chang Hee Nam, "Generation of a broad amplified spectrum in a femtosecond terawatt Ti:sapphire laser by a long-wavelength injection method," J. Opt. Soc. Am. B 16, 1220-1223 (1999)