Abstract
We report direct experimental observation of interesting pulse synchronization dynamics in a cavity-combined Er and Yb mode-locked fiber lasers by measuring the relative position between the two-color pulses in the shared fiber section. The influence of the 1.03 μm pulse on the 1.56 μm single pulse as well as bound soliton pairs can be clearly identified as an effective phase modulation through the XPM effect with the walk-off effect taken into account. For the 1.56 μm single pulse under synchronization, the dependence of the relative position variation and the center wavelength shift on the cavity mismatch detuning is found analogous to the typical characteristics of FM mode-locked lasers with modulation frequency detuning. Moreover, depending on the cavity mismatch, the passively synchronized 1.56 μm bound soliton pairs are found to exhibit two different dynamical behaviors, i.e., phase-locked (in-phase) as well as non-phase-locked. The physical origins for these two kinds of bound soliton pairs are investigated experimentally by disclosing their locations with respective to the copropagating 1.03 μm pulse.
Highlights
The technique of passive synchronization based on the combined effects of cross phase modulation (XPM) and anomalous group velocity dispersion (GVD) [1] has been demonstrated to be an effective method to generate synchronized two-color ultrashort modelocked pulse trains for many potential applications
The passive synchronization technique mentioned above has been successfully used in a variety of ultrafast laser systems [1, 8,9,10,11,12], most of the studies focused on the timing jitter reduction between the two-color pulses and only a few works paid attention to study the underlying two-color pulse dynamics in the passive synchronization by analyzing the relationship between the laser center wavelength shift and the cavity mismatch [1, 9]
We report direct experimental observation results of two-color pulse dynamics under passive synchronization by measuring their relative pulse position in the shared fiber section of the cavity-combined Er and Yb mode-locked fiber lasers
Summary
The technique of passive synchronization based on the combined effects of cross phase modulation (XPM) and anomalous group velocity dispersion (GVD) [1] has been demonstrated to be an effective method to generate synchronized two-color ultrashort modelocked pulse trains for many potential applications. These include the ultrafast optical parametric amplifier (OPA) [2, 3], coherent anti-Stokes Raman scattering (CARS) microscopy [4], and coherent optical pulse/frequency synthesis [5,6,7]. The origins of these two kinds of bound soliton pairs are investigated experimentally by disclosing their locations with respective to the copropagating 1.03 μm pulse
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