Abstract
We demonstrate passive mode locking based on the novel monoclinic double tungstate crystal Yb:KLu(WO4)2. We report the shortest pulses ever produced with an Yb-doped tungstate laser using a semiconductor saturable absorber. A pulse duration of 81 fs has been achieved for an average power of 70 mW at 1046 nm. We compare the performance of the polarization oriented parallel to the Nm- and Np-crystallo-optic axes. Results in the femtosecond and picosecond regime are presented applying either Ti:sapphire or diode laser pumping. The great potential of Yb:KLu(WO4)2 as an active medium for ultrashort pulses is demonstrated for the first time, to our knowledge.
Highlights
The increased attraction of Yb-doped lasers has been emphasized by establishing novel active materials with the Yb3+-ion as a dopant in the 1-μm spectral range [1]
Ytterbium based compact high-power femtosecond laser sources have developed rapidly over the past few years in a great number of hosts [2,3,4,5,6,7]. This is due to the promising peculiarities of the Yb3+– ion related to the very simple energy level scheme constituted of only two levels: the 2F7/2 ground state and the 2F5/2 excited state
The highly efficient laser performance with this novel Yb-doped monoclinic double tungstate was achieved with 2.2-2.8 mm thick, 5 and 10 at% Yb-doped KLuW samples oriented for polarization parallel to the crystallo-optic axis Nm
Summary
The increased attraction of Yb-doped lasers has been emphasized by establishing novel active materials with the Yb3+-ion as a dopant in the 1-μm spectral range [1]. The highly efficient laser performance with this novel Yb-doped monoclinic double tungstate was achieved with 2.2-2.8 mm thick, 5 and 10 at% Yb-doped KLuW samples oriented for polarization parallel to the crystallo-optic axis Nm. Output powers of the order of 1 W with pump efficiencies as high as 50% were obtained at room temperature [13]. From an Yb:KYW laser, pulse durations of 71 fs applying Kerr-lens mode locking [15] and 101 fs using a SAM [16] were demonstrated. For the latter, the highest average power from an Yb-. We demonstrate for the first time, to our knowledge, mode-locked operation of the Yb:KLuW laser achieving sub-100 fs pulses for polarization parallel to the Nm- and Npcrystallo-optic axes
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