Difference-frequency generation between signal and idler of Yb-fiber laser synchronously pumped femtosecond and picosecond optical parametric oscillators (SPOPOs) operating at 53 and 80 MHz, respectively, is investigated in the wide bandgap chalcogenide crystal . Single pulse energies in excess of 1 nJ are demonstrated, and the continuous tuning extends from 5 to 12 μm.
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