Quarter-harmonic generation of femtosecond pulses at 4.18 μm from a mode-locked Yb:Fiber laser

摘要

We report generation of 104 mW of 110-fs pulses at 4.18 μm using two cascaded sub-harmonic PPLN-based optical parametric oscillators pumped by a 950-mW Yb:fiber mode-locked laser at 250 MHz with expected intrinsic phase-locking.