# Optimizing Laser Pulses for Narrowband Inverse Compton Sources in the High-Intensity Regime

## TL;DR

This paper presents a method to generate optimized laser pulses that compensate spectral broadening in high-intensity inverse Compton scattering, enabling narrowband gamma-ray production through a superposition of two oppositely chirped pulses.

## Contribution

The authors introduce a simple analytical model for designing two-pulse laser configurations that narrow the gamma-ray spectrum in high-intensity regimes, validated by simulations.

## Key findings

- Analytical model accurately predicts optimal pulse parameters.
- Optimized pulses significantly reduce spectral broadening.
- Numerical simulations confirm the effectiveness of the method.

## Abstract

Scattering of ultraintense short laser pulses off relativistic electrons allows one to generate a large number of X- or $\gamma$-ray photons with the expense of the spectral width---temporal pulsing of the laser inevitable leads to considerable spectral broadening. In this Letter, we describe a simple method to generate optimized laser pulses that compensate the nonlinear spectrum broadening, and can be thought of as a superposition of two oppositely linearly chirped pulses delayed with respect to each other. We develop a simple analytical model that allow us to predict the optimal parameters of such a two-pulse---the delay, amount of chirp and relative phase---for generation of a narrowband {\gamma}-ray spectrum. Our predictions are confirmed by numerical optimization and simulations including 3D effects.