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High peak-power mid-infrared ZnGeP2 optical parametric oscillator pumped by a Tm:fiber master oscillator power amplifier system

 
: Gebhardt, M.; Gaida, C.; Kadwani, P.; Sincore, A.; Gehlich, N.; Jeon, C.; Shah, L.; Richardson, M.

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Optics Letters 39 (2014), Nr.5, S.1212-1215
ISSN: 0146-9592
Englisch
Zeitschriftenaufsatz
Fraunhofer ILT ()

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.

: http://publica.fraunhofer.de/dokumente/N-283353.html