Characterization of long-cavity GaN vertical-cavity surface-emitting lasers with a topside dielectric lens
Year: 2025
Type: article
Abstract: We present a high-performance GaN-based vertical-cavity surface-emitting laser with a long cavity (70λ), nanoporous GaN distributed Bragg reflector (DBR), and topside dielectric lens, achieving room-temperature continuous-wave operation up to thermal rollover at 34 kA cm−2 and a peak output power of 2.7 mW. Process optimizations significantly improved the lens surface quality, reducing optical losses. The long cavity improved thermal management, leading to a measured thermal impedance of 607 K W−1, the lowest reported for GaN vertical-cavity surface-emitting lasers (VCSELs) with a nanoporous DBR. Spatial mode analysis revealed structured Laguerre–Gaussian-like patterns, with evidence of coherent speckle. These results demonstrate the viability of long-cavity designs for high-power GaN VCSELs.
Institution: University of California, Santa Barbara
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,210
OpenAlex ID: W4410008666