Nanostructured intense-laser cleaner

TL;DR

This paper introduces a nanostructured target that significantly enhances laser contrast by effectively absorbing prepulses and creating a high-quality plasma mirror, improving performance for next-generation intense lasers.

Contribution

It proposes a nanostructured surface design that absorbs prepulses efficiently and transforms into a near-perfect plasma mirror, surpassing conventional methods.

Findings

Enhances laser contrast by about a hundredfold.

Effective for prepulse intensities above 10^14 W/cm2.

Works well with next-generation intense lasers.

Abstract

A nanostructured target is proposed to enhance an intense-laser contrast: when a laser prepulse irradiates a nanostructured solid target surface, the prepulse is absorbed effectively by the nanostructured surface. The nanostructure size should be less than the laser wavelength. After the prepulse absorption, the front part of the main pulse destroys the microstructure and makes the surface a flat plasma mirror. The body of the main pulse is reflected almost perfectly. Compared with conventional plasma mirrors, the nanostructured surface is effective for the absorption of the intense laser prepulse, whose intensity is higher than 10^14 W/cm2. The nanostructured laser cleaner improves the laser pulse contrast by about a hundredfold. The nanostructured laser cleaner works well for next-generation intense lasers.