A tandem optical parametric oscillator (OPO) is used to convert radiation from to the mid-infrared. Spectral bandwidth narrowing close to 80 times compared with a conventional cavity was achieved by using a bulk Bragg grating as an outcoupler in a near-degenerate periodically poled OPO. The narrowed radiation was subsequently used for pumping the OPO, which was tunable between 3.3 and . Pulse energies of and pump depletion close to 70% were obtained in the OPO. To our knowledge this is the first time the output from a near-degenerate type I PPKTP OPO has been used for OPO pumping.
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