Entropy mode driven gas optics

TL;DR

This paper introduces a new method for creating gaseous diffractive optical elements using only entropy modes, avoiding acoustic oscillations, which enhances control, contrast, and operational flexibility of the optical structures.

Contribution

The work presents a novel approach that eliminates the need for acoustic modes in gaseous diffractive optics, enabling arbitrary structure creation and improved operational parameters.

Findings

Enables control of the lifetime and profile of gaseous optical elements.

Allows creation of arbitrary, non-periodic structures like chirped gratings or lenses.

Operates over a wider parameter space, including larger diffraction angles.

Abstract

We propose a novel class of gaseous diffractive optical elements created by imprinting an entropy mode in a gas. Previous approaches to gaseous diffractive optics relied on the simultaneous excitation of a standing acoustic wave and an entropy mode to produce one-dimensional periodic structures. However, the presence of acoustic oscillations in the gas imposes stringent constraints on some operational parameters of these optical elements, such as their lifetime and diffraction angle. In this work, we introduce a new approach that eliminates the acoustic mode, relying solely on the entropy mode. This enables control of the lifetime and temporal profile of gaseous optical elements, and also allows the creation of arbitrary structures with greater contrast, including non-periodic patterns such as chirped gratings or lenses. This approach should allow operation over a wider parameter space, including larger diffraction angles and compatibility with laser pulse durations ranging from femtoseconds to microseconds.