Direct Generation of 148 nm and 44.6 fs Pulses in an Erbium-Doped Fiber Laser

Abstract

This letter demonstrates an experimental realization of effective dispersion and nonlinearity optimization in an Er-doped fiber laser at a high repetition rate of larger than 200 MHz. The maximum power of the direct output pulse at an available pump power of 700 mW is 84.8 mW with a pulse duration of 56.5 fs, which exhibits a high transfer efficiency of 12.1%, single-pulse energy of 0.42 nJ, and pulse peak power of 7 kW. Evolution of the spectral characteristics of the direct output pulse is further studied by adjusting the waveplates and tuning the pump power. 44.6-fs ultrafast pulses with a flat full spectral width at half maximum of 148 nm are directly generated.

Ultrafast Fiber Lasers: An Expanding Versatile Toolbox

“…Especially as the repetition rate exceeds 1 GHz, the cavity fiber is less than 10 cm in length and therefore the active fiber must be highly doped to provide enough gain. Table 1 lists representative ultrafast Yb-doped and Erdoped fiber oscillators fundamentally mode-locked with the repetition rate beyond 150 MHz (Byun et al, 2010;Chen et al, 2007Chen et al, , 2012bCheng et al, 2017Cheng et al, , 2018Du et al, 2017;Huang et al, 2017;Ilday et al, 2005;Li et al, 2013Li et al, , 2014aLi et al, , 2014bLi et al, , 2015Liu et al, 2018;Ma et al, 2010;Martinez andYamashita, 2011, 2012;Song et al, 2019aSong et al, , 2019bWang et al, 2011Wang et al, , 2019Wu et al, 2015a;Xing et al, 2015;Yang et al, 2012;Zhang et al, 2016).…”

Dissipative soliton with sidebands on spectrum in an all-fibre laser

“…In the ultrafast optical field, the passively mode-locked fiber laser was an important technology facilitating the generation of ultrashort pulses [1][2][3][4]. Via the balance of negative groupvelocity dispersion (GVD) and self-phase modulation (SPM), conventional solitons (CS) could be generated in a fiber laser with anomalous dispersion [5].…”