Abstract
We report on a Kerr-lens mode-locked Yb:YSO lasers for the first time. Pumped by a single-mode fiber laser with high brightness and linear polarization, the Yb:YSO laser can deliver as high as 2 W average power with as short as 95 fs pulse duration at the repetition rate of 137.2 MHz, resulting in the single pulse energy of 14.8 nJ and the peak power of 155.7 kW. This work proves the potential on generation of sub-100 fs pulses with multi-watt level average power with the Yb doped oxyorthosilicates crystals.
Highlights
The generation of high power femtosecond pulses directly from a laser oscillator is currently one of the frontiers of ultrafast optics, as their extensive applications range from nonlinear microscopy [1] to ultrafast spectroscopy [2] as well as from frequency conversion [3] to high-field science [4]
Yb doped gain media with several merits including more than 90% quantum efficiency, allowing direct diode pumping, broad emission spectrum as well as long excited state lifetime are well known as optimal alternatives in high power femtosecond pulse generation with reduced heat deposition and thermal loading
An increasing attention has been paid to this family of gain media since last decade. Laser performances on both continuous wave (CW) and mode-locking have been demonstrated
Summary
The generation of high power femtosecond pulses directly from a laser oscillator is currently one of the frontiers of ultrafast optics, as their extensive applications range from nonlinear microscopy [1] to ultrafast spectroscopy [2] as well as from frequency conversion [3] to high-field science [4]. Yb-based femtosecond lasers delivering watt-level sub-100 fs pulses have been reported only in a few kinds of crystals such as Yb:CaF2 [12,13,14], Yb:CGA [15,16,17], Yb:CYA [18], Yb:KGW [19,20,21], Yb:KYW [22], Yb:YVO4 [22], and Yb:Lu2O3 [23] as well as Yb:LuAG ceramic [24] As high as 3.07 W average output power was directly generated from the SESAM mode-locked Yb:LYSO laser, while the pulse duration was 297 fs [28]
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