# Fine-tuning of orbital angular momentum in an optical parametric oscillator

## TL;DR

This paper explores how orbital angular momentum can be fine-tuned in an optical parametric oscillator by adjusting crystal parameters, revealing different dynamical regimes and mode switching behaviors based on anisotropy effects.

## Contribution

It presents a novel investigation into the control of orbital angular momentum transfer in optical parametric oscillators through anisotropy manipulation.

## Key findings

- Fine-tuning of orbital angular momentum transfer achieved in weakly anisotropic regime.
- Abrupt mode switching observed under strong anisotropy.
- Different dynamical behaviors depend on medium anisotropy levels.

## Abstract

We investigate the dynamical properties of a type-II optical parametric oscillator pumped by a structured light beam carrying orbital angular momentum. Different dynamical regimes are theoretically derived and experimentally demonstrated, depending on the anisotropy effects imposed by the nonlinear medium. In a weakly anisotropic regime, fine-tuning of the orbital angular momentum transfer is obtained by adjusting the crystal parameters. Under strong anisotropy, orbital angular momentum transfer is not possible and a sharp dynamical behavior is observed, with abrupt switching between different transverse modes.