Broadband light source device and method of creating broadband light pulses

Abstract

A broadband light source device () for creating broadband light pulses () comprises a hollow-core fiber () of non-bandgap type including a filling gas and being arranged for creating the broadband light pulses () by an optical nonlinear broadening of pump laser pulses (), wherein the hollow-core fiber () has an axial hollow light guiding fiber core (), which supports core modes of a guided light field, and an inner fiber structure (), which surrounds the fiber core () and which supports transverse wall modes of the guided light field, and a pump laser source device () being arranged for creating and providing the pump laser pulses () at an input side () of the hollow-core fiber (), wherein the transverse wall modes include a fundamental transverse wall mode and second and higher order transverse wall modes, the broadband light pulses () have a core mode spectrum being determined by a fiber length, a fiber core diameter, at least one pump pulse and/or beam parameter of the pump laser pulses () and at least one gas parameter of the filling gas, and the inner fiber structure () of the hollow-core fiber () is configured such that at least the second and higher order transverse wall modes and the core mode spectrum have a spectral displacement relative to each other. Furthermore, a method of creating broadband light pulses is described.