Spatial dispersion control with Laue-geometry photonic crystals.

Area of Science:

• Nonlinear optics
• Materials science
• Photonics

Background:

• Kerr self-focusing limits high-power nonlinear optical processes in solid-state materials.
• Controlling spatial dispersion is crucial for managing nonlinear effects.

Purpose of the Study:

• To propose and demonstrate an integrated method for suppressing Kerr self-focusing.
• To engineer spatial dispersion in a Laue-type photonic crystal (PhC) for nonlinearity management.

Main Methods:

• Designed a longitudinally chirped, constant-period Laue-type PhC using beam-propagation modeling.
• Fabricated the PhC in UV-fused silica via femtosecond direct laser writing with a Bessel beam.
• Characterized nonlinear transmission and output beam profiles as a function of input pulse energy.

Main Results:

• The dispersion-engineered PhC effectively counteracted self-focusing compared to bulk material and a reference structure.
• Achieved a 12% increase in the nonlinear absorption threshold.
• Demonstrated practical nonlinearity management through spatial dispersion control in a monolithic PhC.

Conclusions:

• This work presents the first practical demonstration of nonlinearity management using spatial dispersion control in a monolithic PhC.
• Offers a novel pathway to overcome power-scaling limitations in nonlinear optical processes.
• Highlights the potential of engineered photonic crystals for advanced optical applications.