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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>
175 fs Tm:Lu2O3 laser at 2.07 ?m mode-locked using single-walled carbon nanotubes.
Schmidt, Andreas,Koopmann, Philipp,Huber, G?nter,Fuhrberg, Peter,Choi, Sun Young,Yeom, Dong-Il,Rotermund, Fabian,Petrov, Valentin,Griebner, Uwe Optical Society of America 2012 Optics express Vol.20 No.5
<P>Single-walled carbon nanotube saturable absorbers were designed and fabricated for passive mode-locking of bulk lasers operating in the 2 μm spectral range. Mode-locked lasers based on Tm:Lu2O3 single crystals containing different Tm3+-doping concentrations were studied. Nearly transform-limited pulses as short as 175 fs at 2070 nm were generated at 88 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>
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>
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 Cr:YAG laser mode-locked by monolayer graphene saturable absorber.
Davide Di Dio Cafiso, Samuele,Ugolotti, Elena,Schmidt, Andreas,Petrov, Valentin,Griebner, Uwe,Agnesi, Antonio,Cho, Won Bae,Jung, Bo Hee,Rotermund, Fabian,Bae, Sukang,Hong, Byung Hee,Reali, Giancarlo,P Optical Society of America 2013 Optics letters Vol.38 No.10
<P>We report on mode-locking of a Cr:YAG laser at 1516 nm using a monolayer graphene-based saturable absorber of transmission type generating 91 fs pulses with a Fourier product of 0.38 at an average output power exceeding 100 mW. Stable single-pulse mode-locked operation without any sign of Q-switching instabilities or multiple pulses is achieved.</P>
( Predrag Sikiric ),( Ki-baik Hahm ),( Alenka Boban Blagaic ),( Ante Tvrdeic ),( Katarina Horvat Pavlov ),( Andrea Petrovic ),( Antonio Kokot ),( Slaven Gojkovic ),( Ivan Krezic ),( Domagoj Drmic ),( 대한간학회 2020 Gut and Liver Vol.14 No.2
We reviewed again the significance of the stable gastric pentadecapeptide BPC 157 as a likely mediator of Robert’s stomach cytoprotection/adaptive cytoprotection and organoprotection and as novel mediator of Selye’s stress coping response to reestablish homeostasis. Specific points of BPC 157 therapy and the original concept of Robert’s cytoprotection/adaptive cytoprotection/organoprotection are discussed, including the beneficial effects of BPC 157. First, BPC 157 protects stomach cells and maintains gastric integrity against various noxious agents (Robert’s killing cell by contact) and is continuously present in the gastric mucosa and gastric juice. Additionally, BPC 157 protects against the adverse effects of alcohol and nonsteroidal anti-inflammatory drugs on the gastric epithelium and other epithelia, that is, skin, liver, pancreas, heart (organoprotection), and brain, thereby suggesting its use in wound healing. Additionally, BPC 157 counteracts gastric endothelial injury that precedes and induces damage to the gastric epithelium and generalizes “gastric endothelial protection” to protection of the endothelium of other vessels (thrombosis, prolonged bleeding, and thrombocytopenia). BPC 157 also has an effect on blood vessels, resulting in vessel recruitment that circumvents vessel occlusion and the development of additional shunting and rapid bypass loops to rapidly reestablish the integrity of blood flow (ischemic/reperfusion colitis, duodenal lesions, cecal perforation, and inferior vena caval occlusion). Lastly, BPC 157 counteracts tumor cachexia, muscle wasting, and increases in pro-inflammatory/procachectic cytokines, such as interleukin-6 and tumor necrosis factor-α, and significantly corrects deranged muscle proliferation and myogenesis through changes in the expression of FoxO3a, p-AKT, p-mTOR, and p-GSK-3β (mitigating cancer cachexia). (Gut Liver 2020;14:153-167)