High stability white light generation in water at multi-kilohertz repetition rates.

[en] An efficient supercontinuum (SC) generation featuring high spectral intensity across a large bandwidth requires high peak powers of several megawatts from pulsed lasers. Under these conditions and at multi-kilohertz (kHz) repetition rates, the SC generated in most materials is unstable due to thermal effects. In this work, we leverage the superior dispersion properties of water to maximize the spectral width of the SC, while avoiding stability issues due to thermal loading by means of a constant laminar flow of the liquid. This flow is controlled by a differential pressure scheme that allows to precisely adjust the fluid velocity to an optimum value for maximum stability of the SC. This approach is successfully implemented for repetition rates of 50 kHz and 100 kHz and two different pump wavelengths in the visible (VIS) and near infrared (NIR) spectral region with stability of the SC signal only limited by the driving pulses. The resulting water SC spans more than one octave covering the VIS to NIR range. Compared to established materials, such as yttrium aluminum garnet (YAG) and sapphire, the spectral bandwidth is increased by 60% and 40% respectively. Our scheme has the potential to be implemented with other liquids such as bromine or carbon disulfide (CS2), which promise even wider broadening and operation up to the mid-infrared.

Disciplines :

Physics

Author, co-author :

KELLER, Kilian Richard ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)

Rojas-Aedo, Ricardo; Unilu - University of Luxembourg [LU] > Department of Physics and Materials Science (DPHYMS)

VANDERHAEGEN, Aline Inez Dominique ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)

LUDWIG, Markus ; Deutsches Elektronen-Synchrotron DESY

BRIDA, Daniele ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)

External co-authors :

yes

Language :

English

Title :

High stability white light generation in water at multi-kilohertz repetition rates.

Publication date :

06 November 2023

Journal title :

Optics Express

eISSN :

1094-4087

Publisher :

Optica Publishing Group, United States

Volume :

Issue :

Pages :

38400 - 38408

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://opg.optica.org/viewmedia.cfm?URI=oe-31-23-38400&seq=0

Funders :

European Research Council
European Regional Development Fund

Available on ORBilu :

since 06 December 2023

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