Super-Broadband Noise-Like Pulse Erbium-Doped Fiber Ring Laser With a Highly Nonlinear Fiber for Raman Gain Enhancement

High-power fiber laser technology for wavelength conversion

“…In particular, fiber lasers based on rare-earth materials show outstanding performances in terms of efficiency and power scalability, so that they have frequently been being used as gain media for high-power laser applications [1][2][3][4][5][6][7][8][9][10]. In particular, ytterbium (~1.1 μm), neodymium (~0.9, ~1.1, and ~1.3 μm), erbium (~1.5 μm), and thulium (~2 μm) are among the most efficient gain materials used for high-power laser applications.…”

Dual-wavelength noiselike pulse generation via polarization rotation and stimulated Raman scattering in an erbium-doped fiber ring laser

“…The autocorrelation width of the RP pulses does not significantly change after saturation, as opposed to the behaviour reported by Vazquez-Zuniga and Jeong. 9 In their work, the existing NLPs take advantage of the excess of EDFA pump power and broaden temporally without sign of saturation. Again, the observed behaviour suggests an efficient transfer of power towards the Stokes pulses via SRS.…”

“…In a recent publication, Vazquez-Zuniga et al attained a record bandwidth of 135 nm in a ring cavity including a segment of highly nonlinear fiber (HNLF) in normal dispersion. 9 The flat supercontinuum formed by noiselike pulses in their cavity extends towards the long wavelengths up to 1650 nm via stimulated Raman scattering (SRS). Applications in low-coherence interferometry were demonstrated with the characterization of fiber Bragg gratings, 10, 11 optical data storage, 12 temperature distribution measurements, 13 as well as the generation of supercontinuum.…”

“…Stokes pulses are generated from a Raman effect at a wavelength of ∼1650 nm, corresponding to a 13.2 THz offset from the RP pulses. A cavity configuration presented by Vazquez-Zuniga et Jeong, 9 SRS is increased by the addition of a HNLF in normal dispersion, resulting in a flat supercontinuum. We demonstrate that the effect of SRS can be reinforced by taking advantage of a nonlinearity increased by a factor of 100.…”

Power-Scalable, Sub-Nanosecond Mode-Locked Erbium-Doped Fiber Laser Based on a Frequency-Shifted-Feedback Ring Cavity Incorporating a Narrow Bandpass Filter

“…However, in such sub-nanosecond regimes, the bound multiple-trailing pulses tend to have non-negligible splits among the internal pulses, giving rise to strong internal modulation across the whole group of pulses [9]. It should be noted that the mechanism of the bound multiple-trailing pulses in FSFL regimes is far different from that of bunching of random pulses in noise-like pulse regimes [13,14]. Here, we investigate an all-fiberized FSFL that can generate sub-nanosecond mode-locked pulses having no internal pulse-separations by means of incorporating a bandpass filter (BPF) of a narrow bandwidth.…”