# Harmonic Generation in Molecular Ag2S Plasma

## TL;DR

This paper explores how laser-induced plasma from silver sulfide can generate stronger high-order harmonics in the extreme ultraviolet range compared to atomic plasma.

## Contribution

The study demonstrates that molecular Ag2S plasma produces significantly stronger harmonics than atomic Ag plasma.

## Key findings

- Harmonics from Ag2S LIP were 4 to 10 times stronger than those from Ag LIP.
- Up to the 59th harmonic order was achieved under optimal conditions with molecular plasma.

## Abstract

The molecular laser-induced plasma (LIP) produced during the ablation of silver sulfide (Ag2S) was used as a medium for high-order harmonic generation in the extreme ultraviolet range. The role of LIP formation, the plasma components, and the geometry of plasma in the harmonic conversion efficiency was analyzed. We also analyzed the influence of the driving pulses (chirp, single-color pump, two-color pump, and delay between heating and converting pulses) on the harmonic yield in Ag2S LIP. The application of molecular plasma was compared with the application of atomic plasma, which comprised similar metallic elements (Ag) as well as other metal LIPs. The harmonics from the Ag2S LIP were 4 to 10 times stronger than those from the Ag LIP. The harmonics up to the 59th order were achieved under the optimal conditions for the molecular plasma.