Enhancement of terahertz emission during single-color filamentation by chirping laser pulse

TL;DR

This study experimentally investigates how laser pulse duration affects terahertz emission during single-color filamentation, revealing optimal durations for different frequencies and showing that longer pulses can significantly enhance low-frequency terahertz generation.

Contribution

It demonstrates the existence of optimal laser pulse durations for maximal terahertz emission and shows that longer pulses can increase low-frequency terahertz yield despite lower peak power.

Findings

Optimal pulse durations vary with terahertz frequency.

Longer pulses enhance low-frequency terahertz emission.

Terahertz yield can be increased over threefold with pulse chirping.

Abstract

An experimental study of laser pulse duration influence on the terahertz emission during single-color filamentation is carried out. It is shown that for each terahertz frequency there is an optimal laser pulse duration providing maximal generation at constant pulse energy. It is demonstrated that longer pulses are required for stronger low-frequency terahertz emission, thus despite considerable laser peak power decreasing the terahertz radiation yield can be increased by more than 3 times.