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We optimized pre-chirp in an Nd-doped fiber amplifier to achieve high-quality femtosecond 920 nm pulses. The in vivo zebrafish imaging proves the laser amplifier an ideal source in two-photon microscopic imaging.
Plane-wave expansion calculations show that a broad higher-order bandgap can be formed in all-solid honeycomb photonic bandgap fibers, different from fibers based on the typical triangular lattice. Both density of states plots and Bloch-mode field distributions reveal that the higher-order bandgap results from a re-ordering of the linearly polarized modes that form the cladding states, that is, those...
We demonstrate high repetition rate (up to 225 MHz) all-normal dispersion Yb:fiber ring laser. The average output power is 280 mW at a pump power of 6 00 mW. The dechirped pulse is 93 fs.
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