Output signal spectrum of singly resonant femtosecond optical parametric oscillator (SPOPO) based on PPKTP crystal.
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Blue line – tuning of the output signal spectrum by varying the resonator length.
Red line – tuning of the output signal spectrum by varying the PPKTP period.

SPOPO based on PPKTP. Theoretically simulated intensity profile of the signal pulse and the dependence of the conversion efficiency on the round-trip number.
Parameters: l=-15, T=0.09. Pump pulse duration 90 fs.
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SPOPO based on BBO. Oscillations of the signal pulse vs round-trip number.
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