Abstract

We report on the highly efficient generation of widely tunable femtosecond pulses based on intracavity second harmonic generation (SHG) and sum frequency generation (SFG) in a MgO-doped periodically poled LiNbO3 optical parametric oscillator (OPO), which is pumped by a Yb-doped large-mode-area photonics crystal fiber femtosecond laser. Red and near infrared from intracavity SHG and SFG and infrared signals were directly obtained from the OPO. A 2 mm β−BaB2O4 is applied for Type I (oo→e) intracavity SHG and SFG, and then femtosecond laser pulses over 610  nm∼668  nm from SFG and 716  nm∼970  nm from SHG are obtained with high efficiency. In addition, the oscillator simultaneously generates signal and idler femtosecond pulses over 1450  nm∼2200  nm and 2250  nm∼4000  nm, respectively.

© 2013 Optical Society of America

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