Abstract

We report a chirped-pulse optical parametric oscillator (CPOPO) based on a ${\rm KTiOAsO}_4$ (KTA) crystal. Due to the relatively low ratio between its second-order and third-order nonlinear susceptibility, a single KTA crystal could provide parametric gain and intra-cavity spectral broadening simultaneously in a CPOPO. Numerical simulations show that a signal-bandwidth of 390 nm can be obtained from a KTA-based CPOPO, and the pulses can be de-chirped with a width of ${\sim}{20}\;{\rm fs}$ outside the OPO cavity. Experimentally, from a fiber-laser-pumped OPO with a 3-mm-long KTA crystal, we obtained a signal wave covering 1332–1667 nm, with a ${-}{20}\;{\rm dB}$ bandwidth of 45.3 THz, around 12 times as much as the gain-bandwidth of the KTA crystal.

© 2020 Optical Society of America

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