Electro-Optic Sampling of Femtosecond Electric-Field Transients Generated in a Synchronously-Pumped Optical Parametric Oscillator

Ultrabroadband electro-optic sampling (EOS) provides direct access to phase-locked electric-field transients in the mid infrared. So far, these waveforms were generated by single-pass optical rectification [1] or ultrafast electronic transport [2]. Here, we exploit EOS to characterize the intense output generated by a system with feedback – an optical parametric oscillator (OPO) operating in the subharmonic regime.