Demonstration of high-power photonic-crystal surface-emitting lasers with 1-kHz-class intrinsic linewidths

TL;DR

This paper demonstrates high-power photonic-crystal surface-emitting lasers (PCSELs) with an intrinsic linewidth around 1 kHz, combining narrow spectral linewidth with 5 W output power through numerical and experimental analysis.

Contribution

It provides the first experimental demonstration of 1-kHz-class linewidth PCSELs operating continuously at high power levels.

Findings

Achieved 1-kHz-class intrinsic linewidths in PCSELs

Demonstrated 5 W continuous-wave output power

Validated numerical models with experimental results

Abstract

Photonic-crystal surface-emitting lasers (PCSELs) are capable of single-mode, high-power lasing over a large resonator area owing to two-dimensional resonance at a singularity point of the photonic band structure. Since the number of photons in the lasing mode in PCSELs are much larger than those in conventional semiconductor lasers, PCSELs are in principle suitable for coherent operation with a narrow spectral linewidth. In this paper, we numerically and experimentally investigate intrinsic spectral linewidths of 1-mm-diameter PCSELs under continuous-wave (CW) operation, and we demonstrate CW operation with 1-kHz-class intrinsic linewidths and 5-W-class output power.