Abstract
We report the shortest femtosecond pulses directly generated from a solid-state laser that is mode locked by using a single-walled carbon nanotube saturable absorber (SWCNT-SA). In the experiments, we used a 660nm diode-pumped, low-threshold extended-cavity Cr:LiSAF laser operating around 850nm with a repetition rate of 47.9MHz. The SWCNT-SA mode-locked Cr:LiSAF laser produced 21fs pulses with a time-bandwidth product of 0.56 by using only 210mW of pump power. Pump-probe spectroscopy measurements showed that the SWCNT-SA exhibited saturable absorption with slow and fast decay times of 2.7ps and 0.4ps. The single-pass modulation depth and saturation fluence of the SWCNT-SA were further determined as 0.3% and 45 μJ/cm2 at the pump wavelength of 850nm.
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