Diagnosis of the Wavelength Stability of a Mid-Infrared Free-Electron Laser

TL;DR

This paper presents two methods, autocorrelation and sum-frequency mixing, for diagnosing the wavelength stability of a mid-infrared free-electron laser, crucial for its applications.

Contribution

It introduces and compares two novel diagnostic techniques specifically designed for assessing MIR FEL wavelength stability.

Findings

Autocorrelation method effectively measures pulse duration related to wavelength stability.

Sum-frequency mixing provides a direct measure of wavelength fluctuations.

The methods enable improved control and application of MIR FELs.

Abstract

Wavelength stability of free-electron lasers (FELs) is one of the important parameters for various applications. In this paper we describe two different methods to diagnose the wavelength stability of a mid-infrared (MIR) FEL. The first one is based on autocorrelation which is usually used to measure the pulse duration, and the second one is based on frequency upconversion through sum-frequency mixing (SFM).