Albrecht Steinkopff

Apr 14, 2023 | opg.optica.org | Albrecht Steinkopff |Andreas Maier |Stefan Kühn |Nicoletta Haarlammert

AbstractFrequency doubling of a Q-switched Yb-doped rod-type 4 × 4 multicore fiber (MCF) laser system is reported. A second harmonic generation (SHG) efficiency of up to 52% was achieved with type I non-critically phase-matched lithium triborate (LBO), with a total SHG pulse energy of up to 17 mJ obtained at 1 kHz repetition rate. The dense parallel arrangement of amplifying cores into a shared pump cladding enables a significant increase in the energy capacity of active fibers.