title: High peak-power mid-infrared ZnGeP₂ optical parametric oscillator pumped by a Tm:fiber master oscillator power amplifier system.
abstract: We report on the utilization of a novel Tm:fiber laser source for mid-IR ZnGeP2 (ZGP) optical parametric oscillator (OPO) pumping. The pump laser is built in a master oscillator power-amplifier configuration delivering up to 3.36 W of polarized, diffraction limited output power with 7 ns pulse duration and 4 kHz repetition rate. This corresponds to a peak power of ∼121  kW and a pulse energy of ∼0.84  mJ. With this source, we generated 27.9 kW of total mid-IR peak power in a doubly resonant oscillator (DRO) configuration. This is, to the best of our knowledge, the highest ever demonstrated mid-IR peak power from a directly Tm:fiber laser pumped ZGP OPO. Moreover, a DRO output with about 284 μJ of total mid-IR pulse energy was demonstrated using 100 ns pump pulses. The wavelength tuning of the idler was extended to 6 μm with lower output power in another OPO experiment.
authors.forename: Martin
authors.initials: M
authors.lastname: Gebhardt
authors.forename: Christian
authors.initials: C
authors.lastname: Gaida
authors.forename: Pankaj
authors.initials: P
authors.lastname: Kadwani
authors.forename: Alex
authors.initials: A
authors.lastname: Sincore
authors.forename: Nils
authors.initials: N
authors.lastname: Gehlich
authors.forename: Cheonha
authors.initials: C
authors.lastname: Jeon
authors.forename: Lawrence
authors.initials: L
authors.lastname: Shah
authors.forename: Martin
authors.initials: M
authors.lastname: Richardson