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Summary

This summary is machine-generated.

Researchers generated broadband femtosecond supercontinuum light with a dark core using thermal perturbation and a photonic crystal fiber. The dark core size is controllable by adjusting the pump beam power.

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Area of Science:

Nonlinear optics
Laser physics
Materials science

Background:

Supercontinuum generation is crucial for various spectroscopic applications.
Controlling the spatial properties of supercontinuum light, such as core formation, is an active research area.
Previous methods often require complex setups or specific material properties.

Purpose of the Study:

To demonstrate a novel method for generating broadband femtosecond supercontinuum (SC) light with a dark core.
To investigate the influence of thermal perturbation on SC generation in a highly absorbing medium.
To explore the tunability of the dark core diameter.

Main Methods:

Utilized a pump-probe geometry with a continuous wave pump laser and a highly absorbing medium.
Employed a photonic crystal fiber and a nanojoule (nJ) femtosecond oscillator for SC generation.
Performed numerical simulations using the Fresnel-Kirchhoff formula to model the system.
Conducted experimental studies to analyze the power dependence of the dark core diameter.

Main Results:

Successfully generated broadband femtosecond supercontinuum light featuring a distinct dark core.
Observed that a small thermal perturbation in a highly absorbing medium is key to dark core formation.
Experimental results for the dark core diameter showed excellent agreement with numerical simulations.
Demonstrated that the dark core size can be effectively controlled by varying the input power of the pump beam.

Conclusions:

A simple and effective method for generating femtosecond supercontinuum with a controllable dark core has been developed.
The findings provide a new pathway for tailoring supercontinuum properties for advanced applications.
The ability to control dark core size opens possibilities for novel optical device designs.