Low-repetition-rate all-fiber all-normal-dispersion Yb-doped mode-locked fiber laser

Abstract

We demonstrate a low-repetition-rate all-fiber allnormal-dispersion Yb-doped mode-locked fiber laser. Stable mode-locking is achieved by nonlinear polarization rotation and its spectral-filtering effect. Nanosecond pulses with steep edges spectrum at repetition rate 217.4 kHz are achieved. Our preliminary experiment shows that it is a promising seed for all-fiber amplifier system.

Mode-locked fiber lasers with significant variability of generation regimes

“…However, fiber lasers offer another important degree of freedom that can be used for designing novel generation regimes: resonator length. As was demonstrated by multiple groups [25][26][27][28][29][30][31][32][33], the cavity length has a substantial impact on the output pulse parameters in mode-locked fiber lasers. Specifically, it is possible to control the pulse energy and repetition rate by changing the laser cavity.…”

“…Nevertheless, experimentally generating strongly chirped pulses in a 1 km laser cavity with mode-locking due to a carbon nanotube saturable absorber was reported in [25,40]. The paper [28] reports lasing in 1.4 km long Yb-doped fiber laser with steep spectral edges, which are attributed to a ''conventional'', stable, single-pulse generation regime [18,19]. Therefore, in principle, mode-locked fiber master oscillators with long and ultra-long cavities may be used to generate pulses with relatively high energies without any additional amplification or Q-switching, at the same time as they exhibit a broader variety of operation regimes compared to lasers with ''short'' resonators (on the order of several meters).…”

Mode-Locked Fibre Lasers with High-Energy Pulses

“…Such comparative complication of the optical trains for the generation of high-energy pulses justifies the interest in the intra-cavity methods for increasing the pulse energy without any additional amplification stages. A method based on an increase in the cavity length was successfully employed in (Kobtsev et al, 2008a,c;Kong et al, 2010;Nyushkov et al, 2010;Kobtsev et al, 2010a, b, c). However, the experiments show that the stability of ultra-long lasers with nonlinear polarisation evolution (NPE) mode locking is lower compared to the stability of short lasers on the time scale of the round trip of the cavity and on longer time scales (about one hour).…”

Polarization-maintaining amplification of phase modulated pulse employing ytterbium-doped single-mode fiber amplifier

“…Picosecond or femtosecond laser pulse output is achieved in mode locked fiber lasers with novel con figurations or novel devices [1][2][3][4][5]. To maintain the shape of the broadband pulse laser, novel gain flat tened fiber laser configurations and methods have been proposed [6][7][8].…”