Chinese Optics Letters, Volume. 23, Issue 10, (2025)
Tunable Multi-directional Laser Emission Based on a Degenerate Cavity [Early Posting]
A tunable multi-directional laser emission scheme based on a multimode degenerate cavity is proposed. By inserting off-axis pinhole filters in the intracavity far-field plane and leveraging the intrinsic wavefront shaping capability of the resonant field, high-order angular spectrum components of the laser are selectively excited, yielding off-axis oscillations and multi-directional emission. The quantity, direction, coherence, and transverse distribution of the generated beams can be regulated through adjusting the intracavity far-field and near-field modulations, without significantly compromising energy efficiency. This lasing platform holds promise for enhancing the parallel processing abilities of optical sensing and communication systems.