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Mateos, Xavier,Loiko, Pavel,Choi, Sun Young,Rotermund, Fabian,Aguiló,, Magdalena,Dí,az, Francesc,Griebner, Uwe,Petrov, Valentin IOP Publishing 2017 Laser physics letters Vol.14 No.9
<P>The superior performance of a saturable absorber (SA) based on randomly-oriented single-walled carbon nanotubes (SWCNTs) operating in the spectral region of their first fundamental transition E-11 over a graphene-SA containing several (n = 3) carbon layers and a commercial semiconductor SA (SESA) for passive Q-switching of bulk thulium solid-state lasers is demonstrated. Using SWCNT-SA in a compact diode-pumped Tm:KLuW laser, a maximum average output power of 1.36 W is achieved at 1932-1944 nm corresponding to a slope efficiency of 41% and pulse characteristics of 48 ns/5.5 mu J which are superior to that for graphene-SA (123 ns/3.1 mu J) and SESA (61 ns/1.1 mu J). SWCNT-SAs are promising for eye-safe miniature lasers at similar to 2 mu m generating nanosecond pulses in the MHz repetition frequency range.</P>
Choi, Sun Young,Kim, Jun Wan,Kim, Mi Hye,Yeom, Dong-Il,Hong, Byung Hee,Mateos, Xavier,Aguil?, Magdalena,D?az, Francesc,Petrov, Valentin,Griebner, Uwe,Rotermund, Fabian Optical Society of America 2014 Optics express Vol.22 No.13
<P>We report a diode-pumped Yb:KLu(WO(4))(2) (Yb:KLuW) laser passively mode-locked by employing a carbon nanostructure-based multi-functional saturable absorber mirror. Two types of carbon nanostructures, single-walled carbon nanotubes (SWCNTs) and graphene, were deposited on a single dielectric mirror and applied both for stable mode-locking of the Yb:KLuW laser near 1050 nm in a compact cavity configuration. The carbon nanostructure mode-locked laser delivers 157-fs pulses with output powers of up to 85 mW at a repetition rate of 500 MHz.</P>
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>
Femtosecond-laser-written Tm:KLu(WO_4)_2 waveguide lasers
Kifle, Esrom,Mateos, Xavier,de Aldana, Javier Rodrí,guez Vá,zquez,Ró,denas, Airan,Loiko, Pavel,Choi, Sun Yung,Rotermund, Fabian,Griebner, Uwe,Petrov, Valentin,Aguiló,, Magdalen The Optical Society 2017 Optics letters Vol.42 No.6
<P>Depressed-index channel waveguides with a circular and photonic crystal cladding structures are prepared in a bulk monoclinic Tm:KLu(WO4)(2) crystal by 3D direct femto-second laser writing. The channel waveguide structures are characterized and laser operation is achieved using external mirrors. In the continuous-wave mode, the maximum output power of 46 mW is achieved at 1912 nm corresponding to a slope efficiency of 15.2% and a laser threshold of only 21 mW. Passive Q-switching of a waveguide with a circular cladding is realized using single-walled carbon nanotubes. Stable 7 nJ/50 ns pulses are achieved at a repetition rate of 1.48 MHz. This first demonstration of similar to 2 mu m fs-laser-written waveguide lasers based on monoclinic double tungstates is promising for further lasers of this type doped with Tm3+ and Ho3+ ions. (C) 2017 Optical Society of America</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>