Prism-based compensation of group delay dispersion in the components of a femtosecond laser resonator and analysis of the influence of prism configuration on laser radiation parameters

TL;DR

This paper presents a mathematical method for optimizing prism placement in femtosecond laser resonators to effectively compensate group delay dispersion, analyzing how prism configuration impacts laser performance.

Contribution

It introduces a novel algorithm for calculating optimal prism positions and depths for GDD compensation in femtosecond lasers, considering their influence on laser parameters.

Findings

Prism distance and insertion depth significantly affect GDD compensation.

Optimized prism configuration influences the laser's central wavelength and spectral width.

Experimental results confirm the theoretical predictions on laser performance changes.

Abstract

A mathematical algorithm is described for calculating the minimum distance between prisms and the allowable prism insertion depth into the laser beam when solving the general problem of intracavity group delay dispersion (GDD) compensation. GDD is caused by the optical elements of the master oscillator in a femtosecond laser system. The calculation was carried out using analytical and geometrical methods. The influence of changing the distance between the prisms and the depth of their insertion into the laser beam on the GDD compensation has been investigated. Under experimental conditions, this changes the Q-factor of the laser resonator, which determines the central wavelength of the radiation and its spectral width in a titanium-sapphire laser.