Multiple mode-locked regimes of an Er/Yb double-clad fiber laser based on NPR

Abstract

In this paper, we experimentally demonstrate generation of diverse structures of robust optical pulses obtained with a ring cavity passively mode-locked fiber laser based on a double-clad erbium-ytterbium doped fiber, and operating at net-anomalous cavity dispersion. A half-wave and a quarter-wave retarder plates allow adjustable saturable absorbing action by the nonlinear polarization rotation technique. Pulsed laser operation in quasi- continuous wave, molecules of solitons, and single-wavelength noise-like pulses (NLPs) regimes is obtained by properly adjusting the wave retarders. In the soliton and NLPs operating regimes, the central laser wavelength lies in the 1540 nm region. The obtained NLPs exhibit narrow peak coherence of ∼231 fs.

All-fiber all-normal-dispersion passively mode-locked neodymium-doped fiber laser operation at 1064 nm

“…Up to now, a lot of studies have been focused on the applications and expansions of passively mode-locked fiber lasers. Nonlinear polarization rotation (NPR) [13,14], nonlinear amplification loop mirrors [15,16], nonlinear optical loop mirrors [17,18] and some new types of saturable absorbers [19][20][21] have been used in passively mode-locked fiber lasers. NPR is a popular technology to generate ultrafast pulse duration in fiber lasers because of its unique advantages including simple structure, self-starting, low cost and high damage threshold [22,23].…”