In this work, we present an all-polarization-maintaining, all-large-mode-area fiber laser oscillator passively mode-locked using a nonlinear optical loop mirror. The ytterbium-doped system, working in a Raman-free regime, operates at a central wavelength of 1.03 μ;m. The oscillator emits 12 nJ pulses at a repetition rate of 7.56 MHz. Positively chirped pulses from an all-normal-dispersion cavity can be externally compressed to the duration of 250 fs.
A simple scheme for nonlinear refractive index measurement via FROG reconstruction is presented. Samples are measured in weakly focused beam of uJ-level 200 fs pulses. Computing intensity profile and temporal phase for a situation with and without the sample in the beam path yields SPM-induced phase contribution. Through fitting of that phase to intensity profile, n2 of a measured material can be directly calculated.
Different optical materials have been measured (fused silica, calcite, YVO4, BiBO, YAG, CaF2) and are shown to agree well with literature.
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