High-energy, sub-100 fs, all-fiber stretched-pulse mode-locked Er-doped ring laser with a highly-nonlinear resonator

Abstract

We report on ultra-short stretched pulse generation in an all-fiber erbium-doped ring laser with a highly-nonlinear germanosilicate fiber inside the resonator with a slightly positive net-cavity group velocity dispersion (GVD). Stable 84 fs pulses were obtained with a 12 MHz repetition rate at a central wavelength of 1560 nm with a 48.1 nm spectral pulse width (full width at half maximum, FWHM) and 30 mW average output power; this corresponds to the 29.7 kW maximum peak power and 2.5 nJ pulse energy obtained immediately from the oscillator.

High-order soliton evolution and pulse breaking-recovery in stretched ultrafast fiber lasers

“…Researchers proposed using dispersion management to make the pulse stretch and compress in the near zero-dispersion cavity [8,9], which can reduce the average pulse intensity as well as the nonlinear phase accumulation. Usually, the pulse energy output from a stretched fiber laser ranges from ~100pJ to ~3nJ [10][11][12][13][14] and generating higher pulse energy needs normal-dispersion [15,16] to obtain dissipative solitons or gain-guided solitons (GGSs). In the stretched fiber lasers, dispersion management dominates the pulse dynamics rather than the nonlinear processes.…”

“…Researchers tend to reduce the nonlinearity for high energy pulse generation, which might sacrifice the bandwidth and duration of the ultrashort pulse. The bandwidth directly output from stretched fiber lasers is usually ~50nm, which corresponds to a transform-limited pulse duration of ~100fs [10][11][12][13][14]. To obtain transform-limited pulse with ultra-broadband spectrum has potential in optical fiber communications and optical sampling.…”

Dissipative Soliton Resonance in an All-Polarization Maintaining Fiber Laser With a Nonlinear Amplifying Loop Mirror

“…Furthermore, due to the relatively low repetition rate and high main loop pump power, the energy of soliton is high, which means it is easy to split before it is transformed to DSR in the NALM loop. It is remarkable that the intervals of the sub-pulse: 9 . This suggests that the laser has possibility to operate in harmonic mode-locking (HML) in a dissipative soliton resonance (DSR) region [26], [27].…”

“…In order to refrain pulse breaking, a new dissipative soliton mechanism, dissipative soliton resonance (DSR), is proposed to achieve a higher energy output [3]- [8]. The DSR pulse can achieve tens of nanojoules energy which is much higher than conventional solitons [9]- [11]. Akhmediev et al firstly predicted the generation of ultra-high energy in theory as a certain solution of the complex cubic-quintic Ginzburg-Landau equation [12].…”

Focus issue introduction: Advanced Solid-State Lasers (ASSL) 2015

“…Dvoretskiy, Lazarev, Voropaev, Rodnova, Sazonkin, Leonov, Pnev, Karasik and Krylov [11] report on the generation of high-energy ultra-short pulses in an all-fiber erbium-doped ring laser with a highly-nonlinear germanosilicate fiber. With a slightly positive net cavity group velocity dispersion, they obtained stable trains of 84 fs pulses with a central wavelength of 1560 nm and a spectral width of 48.1 nm, at a 12 MHz repetition rate.…”