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We investigate cavity length detuning in a picosecond synchronously pumped optical parametric oscillator based on an aperiodically poled nonlinear crystal. A strong dependence on the sign of the quasi-phase matching period chirp is observed.
It is demonstrated, both theoretically and experimentally, that employing tightly focused Gaussian beam is possible to engineer the efficiency profiles and suppresses ripples in the second-harmonic response of a 30-nm-bandwidth chirped aperiodically poled lithium niobate.
A prototype single-crystal device efficiently converts a μJ-energy near-IR OPA pulse to the mid-IR by adiabatic frequency conversion, generating an octave-spanning pulse covering the 2–5-μm range and suggesting wide applicability to existing laser systems.
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