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Passive mode locking of Yb:KLuW using a single-walled carbon nanotube saturable absorber.
Schmidt, Andreas,Rivier, Simon,Steinmeyer, Gü,nter,Yim, Jong Hyuk,Cho, Won Bae,Lee, Soonil,Rotermund, Fabian,Pujol, Maria C,Mateos, Xavier,Aguiló,, Magdalena,Dí,az, Francesc,Petrov, Va Optical Society of America 2008 Optics letters Vol.33 No.7
<P>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.</P>
Mode locking of a Cr:YAG laser with carbon nanotubes.
Bae Cho, Won,Schmidt, Andreas,Young Choi, Sun,Petrov, Valentin,Griebner, Uwe,Steinmeyer, Gü,nter,Lee, Soonil,Yeom, Dong-Il,Rotermund, Fabian Optical Society of America 2010 Optics letters Vol.35 No.16
<P>We report on mode locking of a bulk Cr:YAG laser by using a transmission-type single-walled carbon nanotube saturable absorber. Stable and self-starting laser operation in the picosecond and femtosecond regimes is obtained at wavelengths around 1.5mum. Tunable transform-limited sub-100fs pulses are generated at a repetition rate of 85MHz with an output power up to 110mW.</P>
Cho, W. B.,Yim, J. H.,Choi, S. Y.,Lee, S.,Schmidt, A.,Steinmeyer, G.,Griebner, U.,Petrov, V.,Yeom, D.-I.,Kim, K.,Rotermund, F. WILEY-VCH Verlag 2010 Advanced Functional Materials Vol.20 No.12
<P>Single-walled carbon-nanotube absorbers are experimentally demonstrated for laser mode-locking. A saturable absorber device is used to mode-lock three different bulk solid-state lasers in a 500 nm-wide wavelength interval. The devices exhibit a low saturation fluence of <10 mu J cm(-2), low scattering losses, and an exceptionally rapid relaxation, with time constants reaching <100 fs. The latter two properties are explained by a decreased curling tendency and increased tube-to-tube interactions of the nanotubes, respectively. These properties are the result of an optimized manufacturing procedure in combination with the use of a starting material with a higher microscopic order. The decreased scattering enables universal use of these devices in bulk solid-state lasers, which tend to be highly sensitive against non-saturable device losses as caused by scattering. The favorable saturable absorption properties are experimentally verified by mode-locking the three lasers, which all exhibit near transform-limited performance with about 100 fs pulse duration. The complete and unconditional absence of Q-switching side bands verifies the small saturation fluence of these devices.</P>
Passive mode-locking of a Tm-doped bulk laser near 2 μm using a carbon nanotube saturable absorber
Cho, Won Bae,Schmidt, Andreas,Yim, Jong Hyuk,Choi, Sun Young,Lee, Soonil,Rotermund, Fabian,Griebner, Uwe,Steinmeyer, Gü,nter,Petrov, Valentin,Mateos, Xavier,Pujol, Maria C.,Carvajal, Joan J.,Aguil The Optical Society 2009 Optics express Vol.17 No.13
<P>Stable and self-starting mode-locking of a Tm:KLu(WO(4))(2) crystal laser is demonstrated using a transmission-type single-walled carbon nanotube (SWCNT) based saturable absorber (SA). These experiments in the 2 microm regime utilize the E11 transition of the SWCNTs for nonlinear saturable absorption. The recovery time of the SWCNT-SA is measured by pump-probe measurements as approximately 1.2 ps. The mode-locked laser delivers approximately 10 ps pulses near 1.95 microm with a maximum output power of up to 240 mW at 126 MHz repetition rate.</P>
Sub-100 fs single-walled carbon nanotube saturable absorber mode-locked Yb-laser operation near 1 µm
Schmidt, Andreas,Rivier, Simon,Cho, Won Bae,Yim, Jong Hyuk,Choi, Sun Young,Lee, Soonil,Rotermund, Fabian,Rytz, Daniel,Steinmeyer, Gü,nter,Petrov, Valentin,Griebner, Uwe The Optical Society 2009 Optics express Vol.17 No.22
<P>Transmission- and reflection-type single-walled carbon nanotube saturable absorbers (SWCNT-SAs) were designed and fabricated for passive mode-locking of bulk lasers in the 1 microm spectral range. Mode-locked laser operation based on a diffusion-bonded Yb:KYW/KYW crystal was demonstrated, and pulses as short as 83 fs and 140 fs were achieved applying reflection-type and transmission-type SWCNT-SA, respectively. The nonlinear parameters of the absorbers were measured to be in close vicinity to those of a semiconductor saturable absorber mirror for the same wavelength range. Mode-locking performance with SWCNT-SAs and the SESAM was compared utilizing the same cavity, with the SESAM resulting in only slightly shorter pulses of 66 fs duration. The nearly identical performance indicates that well-optimized SWCNT-SAs can substitute SESAMs even in the 1 microm region.</P>