Two-photon cavity solitons in active optical media

Area of Science:

• Photonics
• Laser Physics
• Nonlinear Optics

Background:

• Broad-area cascade lasers are crucial for high-power light generation.
• Understanding localized structures in optical systems is key to developing novel photonic devices.
• Previous research has focused on different laser types or intracavity elements.

Purpose of the Study:

• To investigate the spontaneous formation of localized structures in broad-area cascade lasers without absorbing intracavity elements.
• To characterize the nature and properties of these novel optical structures.
• To explore the formation mechanisms, interactions, and stability of these structures.

Main Methods:

• Experimental investigation of broad-area cascade lasers.
• Analysis of spontaneous pattern formation.
• Characterization of optical emission properties (single-photon vs. two-photon).
• Theoretical discussion of formation mechanisms and stability.

Main Results:

• Demonstrated spontaneous formation of two-dimensional bright localized structures (cavity solitons).
• Identified these solitons as islands of two-photon emission within a single-photon emission background.
• Observed and discussed the interaction, properties, and stability of these cavity solitons.

Conclusions:

• Broad-area cascade lasers can support the formation of cavity solitons without absorbing intracavity elements.
• These solitons represent a novel class of localized structures with distinct emission characteristics.
• The findings offer insights into nonlinear optical phenomena and potential applications in photonics.