Generating 84 fs, 4 nJ directly from an Yb-doped fiber oscillator by optimization of the net dispersion

Abstract

We reported a simple and compact Yb-doped fiber femtosecond oscillator, which is based on a dispersion management and nonlinear polarization evolution (NPE) technique. Here, 84 fs, 4 nJ at 1030 nm pulses were generated directly from the mode-locked fiber oscillator by optimization of the net dispersion of the cavity. Only a pair of gratings was used to compensate the positive dispersion caused by the fibers and other optics in the cavity. This is, to our knowledge, the shortest pulse duration directly from a fiber oscillator without any extra compressor outside the cavity.

Compact, Picosecond, Kw-Class Thin-Disk Laser Perla for Hi-Tech Industrial Applications

“…In case of the Perla lasers, ultrashort pulses are generated from a compact Yb-doped fiber oscillators emitting nJ femtosecond pulses in diffraction-limited laser beams. We developed the GoPico and the GoFemto (with a broader spectrum) [Chen 2019] compact oscillators with a nonlinear polarization rotation-based mode-locking scheme fitting well the Perla CPA systems. Generated pulses are stretched to a nanosecond time scale, their pulse repetition rate is reduced by an acoustooptics modulator to 1 MHz, and the pulses are pre-amplified in a system of Yb-fiber-based single-mode and double-clad polarization maintaining fiber amplifiers.…”

All polarization-maintaining passively mode-locked fiber-ring ytterbium-doped laser; from net-normal to net-anomalous dispersion

“…Above that wavelength, erbium is the common choice as a gain medium, whose narrow band performs this task in the form of a gain frequency filtering. On the contrary, when a fiber cavity is deliberatively designed to work in the soliton-like regime below 1.3 µm, it is necessary not only to provide artificially a mechanism to shift the average dispersion from net-normal to netanomalous −see [10], and references therein− but also some kind of frequency limiter, since ytterbium as a gain medium cannot perform this task, due to its broadband emission characteristics. An interesting solution to this trade-off was to take advantage of the possibilities offered by ytterbium-doped photonic crystal fibers in its different variations, which simultaneously provide gain, dispersion compensation, and spectral filtering, in a single element.…”