Gouy-phase effects in the frequency combs of an optical parametric oscillator

TL;DR

This paper studies how transverse mode effects and Gouy-phase influence the frequency combs generated by a type-I optical parametric oscillator, revealing that structured light pumping can produce multiple combs and enable complex entanglement.

Contribution

It provides a detailed analysis of diffraction and mode effects in OPOs, showing the generation of multiple frequency combs with structured pump light, advancing understanding of spatiotemporal entanglement.

Findings

Structured pump light produces multiple frequency combs.

Diffraction effects significantly influence comb properties.

Potential for generating hybrid multipartite entanglement.

Abstract

We investigate the transverse mode effects on the frequency combs generated by a type-I optical parametric oscillator (OPO) below threshold. We take the diffraction effects fully into account, considering usual OPO architectures instead of the self-imaging design. Further, we show that an OPO pumped with structured light produces multiple frequency combs simultaneously, corresponding to different combinations of spatial modes in the downconverted fields. This result may apply to the production of hybrid multipartite entanglement in the spatiotemporal modes of a single OPO.