Mode locking of an Yb-doped bulk laser in the 1 microm spectral range using a single-walled carbon nanotube saturable absorber (SWCNT-SA) is demonstrated for the first time, to our knowledge. Passive mode locking of an Yb:KLuW laser resulted in nearly transform-limited pulses as short as 115 fs at 1048 nm. In addition, the nonlinear response of the SWCNT-SA was measured, yielding a modulation depth of 0.25% and a relaxation time of 750 fs.
"Single-walled carbon nanotube saturable absorber (SWCNT–SA) can easily be produced in the form of thin films including three steps of nanotube growth, dispersion, and deposition processes. It exhibit fast recovery time, chemical stability, and broad spectral range, roughly between 1 and 2 mm     . More recently, vertical evaporation method was used to fabricate single-walled carbon nanotubes absorber for 1 mm mode locking solid-state lasers and the output power of the pulse laser is as high as 3.6 W  . "
[Show abstract][Hide abstract] ABSTRACT: We report the first demonstration, to our knowledge, of passive Q-switched mode-locking in a Tm3+:YAP laser, operating in the 2μm broadly spectral region formed with a compact Z-flod cavity. A transmission-type single-walled carbon nanotube saturable absorber (SWCNT–SA) is used for the initiation of the pulse generation. The repetition rate of the Q-switched envelope was 60kHz at the pump power of 8.6W. The mode-locked pulses inside the Q-switched pulse envelope had a repetition rate of ∼92MHz. A maximum average output power of 761mW was obtained. The dependence of the operational parameters on the pump power was also investigated experimentally.
[Show abstract][Hide abstract] ABSTRACT: We characterize the saturable absorption properties of the E11 and E22 transitions of the same highly-purified film of single-wall carbon-nanotubes, and compare the results in terms of modulation-depth, saturation-intensity and mode-locked fiber laser performance.
[Show abstract][Hide abstract] ABSTRACT: By using a piece of single-walled carbon nanotube saturable absorber, the performance of the passively Q-switched composite Nd:YVO4 laser has been demonstrated for the first time. The maximum average output power and the shortest pulse width are 1220 mW and 103 ns at the incident pump power of 5.04 W for a 10% transmission of the output coupler. The highest pulse repetition rate of 415.6 kHz and the largest single-pulse energy of 2.94 μJ are also obtained. The composite Nd:YVO4 crystal has more excellent laser performance than the normal Nd:YVO4 crystal at 1064 nm.
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