Terahertz generation by beamlet superposition

TL;DR

This paper presents an analytical theory demonstrating that superposing beamlets enhances terahertz radiation's spatial homogeneity and efficiency, especially for large bandwidths and beam sizes, outperforming traditional tilted-pulse-front methods.

Contribution

It introduces a novel superposition of beamlets approach for terahertz generation, providing closed-form expressions and optimal conditions, improving upon existing tilted-pulse-front techniques.

Findings

Superposition of beamlets yields more homogeneous terahertz fields.

Enhanced efficiency for large bandwidths and beam sizes.

Derived conditions for optimal terahertz generation parameters.

Abstract

We analytically show how a superposition of beamlets produces terahertz radiation with greater spatial homogeneity and efficiency compared to tilted-pulse-fronts generated by diffraction gratings. The advantages are particularly notable for large pump bandwiths and beam sizes, alluding to better performance in the presence of cascading effects and higher energy pumping. A theory of terahertz generation using a superposition of beamlets is developed. It is shown how such an arrangement produces a distortion free tilted-pulse-front. Closed form expressions for terahertz spectra and transients in three spatial dimensions are derived. Conditions for obtaining performance parity and bounds for optimal parameters are furnished.