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SPM-enabled spectral selection (SESS) constitutes a powerful fiber-optic technique to generate wavelength broadly tunable femtosecond pulses. In the current demonstration, the maximum tuning range is 400 nm and the energy conversion efficiency from the pump source to the outmost spectral lobes is ∼25%. In this submission, we apply the particle swarm optimization method to the generalized nonlinear Schrödinger equation to identify the optimal parameters that maximize both the tuning range and the conversion efficiency. We show that SESS in an optical fiber with the optimized dispersion can deliver SESS pulses tunable in one octave wavelength range and the conversion efficiency can be as high as 80%. We further show the feasibility of experimental implementation based on specially designed fibers or on-chip waveguides.

Pre-chirp managed amplification (PCMA) allows the generation of optical pulses with a duration well below 100 fs. However, the pulse peak power is limited to 30 times improvement in both pulse energy and peak power compared with current Yb-fiber PCMA systems.

We apply particle swarm optimization algorithm to optimize SPM-enabled spectral selection (SESS) and demonstrate highly efficient SESS which delivers MW peak-power femtosecond pulses with the wavelength tuning range exceeding one octave.

We demonstrate an Yb-fiber based pre-chirp managed amplification system that emits 50-MHz, 47-fs pulses with 101.2-W average power. Using chirped mirrors as a compressor, we achieve 98% throughput efficiency.

OSA continuum 3(7), 1988-1998 (2020). doi:10.1364/OSAC.392981, We incorporate two techniques into pre-chirp managed amplification (PCMA) to achieve high-energy ultrashort pulses with the duration well below 100 fs. Numerical simulations confirmed by our experimental results demonstrate that seeding PCMA with circularly polarized pulses instead of linearly polarized pulses can increase the amplified pulse energy by 1.5 times. We also employ high-dispersion chirped mirrors to compress the amplified pulses with the throughput efficiency as high as 98%. These two techniques allow us to demonstrate an Yb-fiber PCMA system that emits 50-MHz, 47-fs pulses with 101.2-W average power., Published by OSA, Washington, DC

We propose and analyze pre-chirp managed divided pulse amplification based on composite birefringent plates for pulse division and combination. Yb-fiber system using this technique can deliver

We incorporate circularly polarized seeding pulses and high-dispersion mirror compressor into pre-chirp managed amplification and obtain 50-MHz, 47-fs pulses with 101.2-W average power. The efficiency of the pulse compression is >98%.

We incorporate pre-chirp management into SPM enabled spectral selection to improve efficiency and reshape unfavorable input flat-top pulses. This new technique produces megawatt-level femtosecond pulses tunable in the wavelength range of 0.86-1.3 µm.

Post-pulse-compression is demanded to produce energetic few-cycle pulses. We propose pre-chirp-managed adiabatic soliton compression (ASC) in gas-filled pressure-gradient hollow-core fibers to suppress the detrimental pedestals and therefore significantly improve the compressed pulse quality. We show that two-stage ASC can compress 125 μJ, 130 fs pulses at 2 μm to a nearly two-cycle pulse 15 fs in duration. Our analytical analysis suggests that ASC is in favor of compressing pulses centered at a longer wavelength. As an example, a 280 μJ, 220 fs Gaussian pulse at 4 μm is compressed to 60 fs with minimal pedestals. We expect that the resulting high-quality, energetic few-cycle pulses will find important applications in high-field science.