Electromagnetically-Induced-Transparency-Like Effect in the Degenerate Triple-Resonant Optical Parametric Amplifier

TL;DR

This paper experimentally demonstrates an EIT-like effect in a triple-resonant optical parametric amplifier, revealing a narrow transparency window and steep dispersion that can enable slow light, unlike in double-resonant configurations.

Contribution

It shows that EIT-like phenomena can be simulated in triple-resonant OPAs with narrower harmonic cavity linewidths, a feature not present in double-resonant setups.

Findings

Narrow transparency window observed in reflected field.

Steep dispersive profile enabling slow light.

EIT-like effect specific to triple-resonant configuration.

Abstract

We investigate experimentally the absorptive and dispersive properties of triple-resonant optical parametric amplifier OPA for the degenerate subharmonic field. In the experiment, the subharmonic field is utilized as the probe field and the harmonic wave as the pump field. We demonstrate that EIT-like effect can be simulated in the triple-resonant OPA when the cavity line-width for the harmonic wave is narrower than that for the subharmonic field. However, this phenomenon can not be observed in a double-resonant OPA. The narrow transparency window appears in the reflected field. Especially, in the measured dispersive spectra of triple-resonant OPA, a very steep variation of the dispersive profile of the subharmonic field is observed, which can result in a slow light as that observed in atomic EIT medium.