Investigation of noise correlations in the phase-locked class-A VECSEL array

Area of Science:

• Laser physics
• Optics
• Quantum optics

Background:

• Noise correlations in laser arrays are crucial for understanding device performance.
• Vertical External Cavity Surface Emitting Lasers (VECSELs) offer a versatile platform for creating laser arrays.

Purpose of the Study:

• To investigate the noise correlations in VECSEL-based laser arrays.
• To analyze the impact of phase-locking on noise correlations.
• To develop a theoretical model explaining the observed phenomena.

Main Methods:

• Theoretical study using a rate equation model.
• Experimental investigation of two- and three-laser VECSEL arrays.
• Utilizing a planar degenerate cavity with a mask in a self-imaging position.
• Analyzing noise correlations under phase-locked and unlocked conditions.

Main Results:

• Observed significant differences in noise correlations between phase-locked and unlocked VECSEL arrays.
• Demonstrated controllable complex coupling coefficients via diffraction.
• Validated the rate equation model, including class-A laser dynamics.

Conclusions:

• The study successfully explains the noise behavior of VECSEL laser arrays.
• The Henry α-factor and complex coupling coefficients significantly influence noise correlations.
• The findings provide insights into controlling and optimizing laser array performance.