Abstract

We demonstrated that by introducing an extra optical material with a high nonlinear refractive index into a conventional optical parametric oscillator (OPO) cavity and managing the intra-cavity dispersion, a chirped-pulse OPO (CPOPO) can be constructed, generating optical pulses with an instantaneous bandwidth much wider than the pump bandwidth. Experimentally, from a CPOPO pumped by a Yb-fiber laser system centered at 1058 nm with a pulse duration of 230 fs and a 20dB bandwidth of 8.7 THz, we obtained a signal wave with a 20dB bandwidth of 28.4 THz and an idler wave covering 2900–3960 nm with a 20dB bandwidth of 27.7 THz.

© 2018 Optical Society of America

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