21 fs Cr:LiSAF laser mode locked with a single-walled carbon nanotube saturable absorber

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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 660 nm diode-pumped, low-threshold extended-cavity Cr:LiSAF laser operating around 850 nm with a repetition rate of 47.9 MHz. The SWCNT-SA mode-locked Cr:LiSAF laser produced 21 fs pulses with a time-bandwidth product of 0.56 by using only 210 mW of pump power. Pump-probe spectroscopy measurements showed that the SWCNT-SA exhibited saturable absorption with slow and fast decay times of 2.7 ps and 0.4 ps. The single-pass modulation depth and saturation fluence of the SWCNT-SA were further determined as 0.3% and 45 mu J/cm(2) at the pump wavelength of 850 nm. (C) 2019 Optical Society of America
Publisher
OPTICAL SOC AMER
Issue Date
2019-10
Language
English
Article Type
Article
Citation

OPTICS LETTERS, v.44, no.19, pp.4662 - 4665

ISSN
0146-9592
DOI
10.1364/OL.44.004662
URI
http://hdl.handle.net/10203/268102
Appears in Collection
PH-Journal Papers(저널논문)
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