Investigation of all-in-fiber Yb doped femtosecond fiber oscillator for generation of parabolic pulses in normal dispersion fiber amplifier

178 fs, 1.2 nJ pulses from an all-polarization maintaining fiber figure 8 laser based on 3 × 3 coupler at 1 μm

“…The corresponding pulse energies are respectively 9.6 pJ and 61 pJ. This is the typically average power delivered by ML regime based on SESAM [21]. So, our laser with this repetition rate and a low average power is already a good competitor to standard ML fiber laser without any required modification on the amplifier chains.…”

“…In order to reach these targeted values, the spectrum must be broaden while keeping the linear chirp. This can be obtained via parabolic evolution [21,22]. With this in mind, we spliced the PM980 fiber of the output 4 to a 15 m long PM nonlinear fiber with a mode field diameter (MFD) of 3.6 µm (coractive SCF-UN-3/125-PM).…”

Environmentally stable all‐fiber femtosecond laser for industrial application based on a SESAM mode‐locked ytterbium‐doped laser

“…The following references with fiber-pigtailed SESAM as mode locker is more similar with our experimental configurations. 15,[28][29][30][31] Zhang et al demonstrated a compact dissipative soliton ML fiber laser with simple configuration and generates ultrafast pulses with 24 ps. 15 The research 30 demonstrated a compact oscillator with a commercially filter embedded in the loop.…”

“…The research reported by Lv et al at 2018 31 has shown the narrow spectrum bandwidth of 4 nm and relatively wide pulse duration of 20.6 ps. As stated in the literature, 29,32,33 the excellent seeder of amplifiers has a few ideal characteristics. First, the full width of half maximum (FWHM) of the ultrafast laser is preferably greater than 15 nm.…”