Spatial structure of broad-area vertical-cavity regenerative amplifiers.

Area of Science:

• Laser Physics
• Nonlinear Optics
• Photonics

Background:

• Broad-area vertical-cavity regenerative amplifiers are crucial for high-power laser applications.
• Understanding their spatial dynamics is key to controlling laser output.
• Previous theoretical work predicted specific pattern formations.

Purpose of the Study:

• To investigate the spatial structure of broad-area vertical-cavity regenerative amplifiers.
• To experimentally verify the predicted formation of hexagonal patterns.
• To explore the control of pattern length scales.

Main Methods:

• Injection of a homogeneous beam into a broad-area vertical-cavity regenerative amplifier.
• Analysis of the emergent spatial patterns.
• Control of pattern length scale via detuning.

Main Results:

• Observed spatial patterns exhibit predominantly sixfold rotational symmetry.
• Experimental results confirm the predicted formation of hexagons.
• The length scale of the patterns is controllable through detuning.

Conclusions:

• Hexagonal patterns are a fundamental spatial structure in these amplifiers.
• Detuning provides a mechanism for controlling the scale of these optical patterns.
• The findings align with theoretical predictions for tilted wave formation.