Search

Efficient dual-wavelength continuous-wave (CW) and passively Q-switched laser operation of Nd:(Gd 0.3 Y 0.7 ) 2 SiO 5 crystal were investigated for the first time to our knowledge. Maximum CW output power of 2.3 W was obtained under the absorbed pump power of 4.6 W, corresponding to the slope efficiency of 55%. Dual-wavelength CW laser with respective wavelengths around 1074 nm and 1078 nm were achieved. With Cr 4+ :YAG as the saturable absorber, passive Q-switched performance was obtained. The slope efficiency of passively Q-switched operation was 45%. The shortest pulse width, the corresponding pulse energy and peak power were calculated to be 13.1 ns, 50.2 μJ and 3.8 kW, respectively. [ABSTRACT FROM AUTHOR]

Abstract: Absorption spectrum from 400 to 2000nm and upconversion fluorescence spectra under 940nm pumping of YAG single crystal codoped with 5at.% Yb3+ and 4at.% Tm3+ were studied at room temperature. The blue upconversion emission centered at 483nm corresponds to the transition 1G4 → 3H6, the emission band around 646nm corresponds to the transition 1G4 → 3F4 of Tm3+. Energy transfer from Yb3+ to Tm3+ is mainly nonradiative and the transfer efficiency was experimentally assessed. The line strengths, transition probabilities and radiative lifetimes of 1G4 level were calculated by using Judd–Ofelt theory. Gain coefficient calculated from spectra shows that the upconversion corresponding with transitions 1G4 → 3H6 in YAG doped with Yb3+ and Tm3+ is potentially useful for blue light output. [Copyright &y& Elsevier]

We report on a femtosecond semiconductor saturable absorber mirror (SESAM) mode-locked Yb:LuYAG laser. Pumped by a 976 nm single-mode fiber laser, a self-starting mode-locked Yb:LuYAG laser was demonstrated, delivering a 618-mW output power with 140-fs pulses and a 95.4-MHz repetition rate. The output spectrum is centered at 1053 nm with a spectral width of 10.4 nm. To the best of our knowledge, this is the shortest pulse ever generated from a mode-locked Yb:LuYAG laser. [ABSTRACT FROM AUTHOR]

A multilayer black phosphorus, as a novel two dimensional saturable absorber, has superb saturable absorption properties for a Er:CaF 2 solid-state pulse laser. The pulse laser is realized at mid-infrared region with the passively Q-switched technology by a diode-pumping. The high-quality black phosphorus saturable absorber is fabricated by liquid phase exfoliation method. The pulse laser generates the pulses operation with the pulse duration of 954.8 ns, the repetition rate of 41.93 kHz, the pulse energy of 4.25 μ J and the peak power of 4.45 W. Our work demonstrates that black phosphorus could be used as a kind of efficient mid-infrared region optical absorber for ultrafast photonics. [ABSTRACT FROM AUTHOR]

We report diode-pumped Nd:LuYAG mixed crystal lasers around 1.06 μm. In free running mode, single wavelength laser at 1063.88 nm is obtained with maximum output power of 8.71 W and slope efficiency of 60.4%. The laser result represents the best laser performance of Nd:LuYAG laser so far. Using an undoped YAG thin plate to act as intracavity etalon, four simultaneous dual-wavelength lasers can be yielded, i.e. 1064.12 and 1060.95 nm with maximum output power of 4.32 W and slope efficiency of about 31.6%, 1064.37 and 1072.89 nm with maximum output power of 2.06 W and slope efficiency of about 15.0%, 1063.88 and 1052.41 nm with maximum output power of 1.82 W and slope efficiency of about 14.4%, as well as 1063.88 and 1068.26 nm with maximum output power of 1.51 W and slope efficiency of about 13.1%. These dual-wavelength lasers are all generated for the first time to our knowledge in Nd:LuYAG crystal. The multiple peak structure of the Nd:LuYAG mixed crystal like Nd:YAG single crystal could be a potential laser source for THz wave generation. [ABSTRACT FROM AUTHOR]

Abstract: We report on the sub-100fs pulse generation in a diode pumped Yb3+:Sc2SiO5 (Yb:SSO) laser. Pumped by a 976nm single emitter diode and mode-locked with a SESAM, the laser generated stable mode locked pulses with 71fs duration, 89MHz repetition rate, and an average power of 38mW at 1044.6nm under the incident pump power of 6.5W. To the best of our knowledge, this is the shortest pulse ever produced from an Yb3+ doped orthosilicate crystal laser. [Copyright &y& Elsevier]

Antiphase dynamics has been observed experimentally for the laser modes operation in a laser-diode-pumped Q-switched microchip Yb:YAG laser with GaAs as a saturable absorber in the presence of spatial hole-burning. The Q-switched pulses sequences of two modes at different pump power have been obtained. The experimental results have shown that the pulses sequences displayed classic antiphase dynamics. [Copyright &y& Elsevier]

In this paper, we have demonstrated a continuous-wave (CW) dual-wavelength Yb:LuYAG laser which works at 1029.41 and 1047.16 nm simultaneously. The laser operation state of dual-wavelength can be adjusted continuously by change the angle of the cavity mirror. And passively Q-switched operation of the crystal Yb:LuYAG was proceeded at the wavelength of 1028.99 nm using the MoS 2 saturable absorber. The pulse duration and maximum repetition rate were 293 ns and 251.27 kHz, respectively. [ABSTRACT FROM AUTHOR]