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Zhang, Yuangeng,Petrov, Valentin,Griebner, Uwe,Zhang, Xingyu,Choi, Sun Young,Gwak, Ji Yoon,Rotermund, Fabian,Mateos, Xavier,Yu, Haohai,Zhang, Huaijin,Liu, Junhai Optical Society of America 2014 Optics express Vol.22 No.5
<P>A diode-pumped Yb:CLNGG laser is mode-locked with a single-walled carbon nanotube saturable absorber (SWCNT-SA) for the first time. Pulse durations as short as 90 fs are obtained at ~1049 nm with 0.4% output coupler, the shortest pulses to our knowledge for a diode-pumped 1-?m laser applying SWCNTs as saturable absorber. Using 3% output coupler, the maximum average output power reached 90 mW at a repetition frequency of 83 MHz.</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>
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, Won Bae,Yim, Jong Hyuk,Choi, Sun Young,Lee, Soonil,Griebner, Uwe,Petrov, Valentin,Rotermund, Fabian Optical Society of America 2008 Optics letters Vol.33 No.21
<P>We report what we believe to be the first passive mode-locking of Cr:forsterite laser using a single-walled carbon nanotube saturable absorber (SWCNT-SA). The dispersion-compensated Cr:forsterite laser in a self-starting configuration produces nearly Fourier transform-limited pulses as short as 120 fs near 1.25 microm. The maximum average output power of 202 mW obtained with a 5% output coupler at a repetition rate of 79.1 MHz represents, to the best of our knowledge, the highest power level ever reported for SWCNT-SA mode locking of solid-state lasers.</P>
Agnesi, A.,Greborio, A.,Pirzio, F.,Ugolotti, E.,Reali, G.,Sun Young Choi,Rotermund, F.,Griebner, U.,Petrov, V. IEEE 2012 IEEE journal on selected topics in quantum electro Vol.18 No.1
<P>In this paper, single-mode 200-mW laser diodes have been demonstrated to be very effective pump devices for low-power Nd:glass lasers, yielding the remarkable continuous wave (cw) slope efficiency of 46.5% for silicate and 58.2% for phosphate glasses, respectively. Femtosecond operation has been investigated with both semiconductor saturable absorber mirrors (SESAMs) and a single-walled carbon nanotube SAM (SWCNT-SAM). Furthermore, a detailed comparison of the mode-locking performance with Nd:phosphate and Nd:silicate, employing either one of the SA devices is presented. Although not fully optimized for this particular application yet, SWCNT-SAs yielded sub-100-fs pulses for the first time in Nd:glass. With SESAM mode locking and a single-prism resonator for dispersion compensation, pulse duration as short as 92 fs has been measured, whereas shorter pulses down to 80 fs have been obtained with a two-prism resonator. Tuning range as broad as 30 nm and output power up to 55 mW have also been achieved, confirming the effectiveness of the proposed laser architecture.</P>
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>
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>