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Combining the configurations of collinear and small-angle noncollinear phase-matching,a mid-infrared(MIR) femtosecond optical parametric amplifier(OPA) with extended tunability is proposed and demonstrated.A tuning range from 2.0 μm to 4.7 μm is demonstrated by a two-stage LiNbO3-based femto-second OPA,which well exceeds the typical tuning range reported so far.MIR femtosecond pulses with energy up to 30 μJ are obtained.
Combining the configurations of collinear and small-angle noncollinear phase-matching, a mid-infrared (MIR) femtosecond optical parametric amplifier (OPA) with extended tunability is proposed and demonstrated. A tuning range from 2.0 μm to 4.7 μm is demonstrated by a two -stage LiNbO3-based femto-second OPA, which well exceeds the typical tuning range reported so far. MIR femtosecond pulses with energy up to 30 μJ are obtained.