Max-planck-gesellschaft Zur F&#xf6;rderung Der Wissenschaften E. V.

Asml Netherlands B.v.

Philip Russell

Patrick Sebastian Uebel

Sebastian Thomas Bauerschmidt

Michael Henoch Frosz

Amir Abdolvand

Shangran Xie

Abhinav Sharma

Federico Belli

John Travers

Richard Zeltner

A hollow-core anti-resonant-reflecting fibre (HC-AF) includes a hollow-core region, an inner cladding region, and an outer cladding region. The hollow-core region axially extends along the HC-AF. The inner cladding region includes a plurality of anti-resonant elements (AREs) and surrounds the hollow-core region. The outer cladding region surrounds the inner cladding region. The hollow-core region and the plurality of AREs are configured to provide phase matching of higher order hollow-core modes and ARE modes in a broadband wavelength range.

Hollow-core fibre and method of manufacturing thereof

A particle testing apparatus, being configured for investigating particles in a fluid medium, includes a waveguide device having a hollow optical waveguide with an input end and an output end, an irradiation device including a laser source being arranged for optically trapping at least one particle at the input end of the optical waveguide and propelling the particle through the optical waveguide toward the output end thereof, and a measuring device being arranged for sensing the at least one particle in the optical waveguide, wherein the measuring device is arranged for measuring an optical transmission of the optical waveguide. Furthermore, a particle testing apparatus is described.

Apparatus and methods for particle testing

A hollow-core fiber () of non-bandgap type comprises a hollow core region () axially extending along the hollow-core fiber () and having a smallest transverse core dimension (D), wherein the core region () is adapted for guiding a transverse fundamental core mode and transverse higher order core modes, and an inner cladding region () comprising an arrangement of anti-resonant elements (AREs) (A,B) surrounding the core region () along the hollow-core fiber (), each having a smallest transverse ARE dimension (d) and being adapted for guiding transverse ARE modes, wherein the core region () and the AREs (A,B) are configured to provide phase matching of the higher order core modes and the ARE modes and the ARE dimension (d) and the core dimension (D) are selected such that a ratio of the ARE and core dimensions (d/D) is approximated to a quotient of zeros of Bessel functions of first kind (u/u), multiplied with a fitting factor in a range ofto, with m being the m-th zero of the Bessel function of first kind of order, said zeros of the Bessel functions describing the LPARE modes and LPhigher order core modes, respectively. Furthermore, an optical device () including the hollow-core fiber () and a method of manufacturing the hollow-core fiber are described.

A method of spectrally broadening light pulses includes the steps of providing the light pulses with a laser source, said light pulses having a pulse duration below 1 ps, in-coupling the light pulses into a hollow optical waveguide device, and spectrally broadening the light pulses propagating along the pulse guiding medium by subjecting them to a Raman nonlinearity via excitation of a Raman polarization having a first Raman period, wherein the optical waveguide device subjects the light pulses to anomalous group velocity dispersion which combines with the spectral broadening of the light pulses to result in a Raman-enhanced self-compression of the light pulses, and the light pulses further propagate along the optical waveguide device such that the Raman-enhanced self compression results in a further excitation of a Raman polarization having a second Raman period which is faster than the first Raman period.

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Roettenbach, Germany

Philip Russell