Long-range soliton interactions through gain-absorption depletion and recovery

Abstract

We report the interpulse dynamics in fiber soliton laser because of depletion and relaxation of gain and absorption. The soliton interaction range is shown to depend largely on the relaxation time of dissipative parameters while the compensation of the dynamical gain and absorption depletion leads to the formation of stationary soliton groups with unequal interpulse distances.

Revealing the Buildup Dynamics of Harmonic Mode‐Locking States in Ultrafast Lasers

“…The HML generated in passively mode-locked lasers attributes to the longrange interaction of pulses by means of the acoustic-wave (AW) effect, [16,31,32] the non-soliton component (i.e., the dispersive wave (DW) or continuous wave) of radiation in the cavity, [33][34][35] and the gain depletion and recovery (GDR) mechanism. [36][37][38] The passive HML phenomena have been demonstrated in a wide variety of theoretical and experimental configurations in mode-locked lasers. [39][40][41][42][43][44][45] A 285th HML laser was reported in 1993.…”

Rogue waves generation via nonlinear soliton collision in multiple-soliton state of a mode-locked fiber laser

“…As well known, there are several mode-locking states in fiber lasers. Soliton bunch is a state in which many solitons bound into a group [13][14][15]. This state provides the possibility to simplify the burst-mode amplifier systems [16,17].…”

Infiltrated bunch of solitons in Bi-doped frequency-shifted feedback fibre laser operated at 1450 nm

“…Soliton group dynamics are determined mainly by the dissipative parameters of the system – saturated gain and slow relaxing saturable absorption. The action of these parameters leads to the pulse drift into the region of the maximum gain, thereat the saturated gain contributes to mutual repulsion of pulses and the formation of harmonic mode-locking regime; saturable absorption, on the contrary, provides a contraction of pulse groups into tight bunches83334. The bunch build-up in the experiment shows the influence of slow relaxing saturable absorption in the Bi-doped fibre dominates over saturated gain.…”

“…As a result, the pulse envelope is shifted to the region of lower absorption and the i th soliton experiences an additional velocity drift proportional to Δ l i in the direction of t  → ∞. How soliton drift velocity changes under the influence of saturable and relaxing dissipative parameters is considered in greater detail in refs 33,34. In this work, we concentrate on the features of group dynamics in the system with relaxing slow saturable absorption.…”