Broadband‐Tunable Microlaser Through Dissipative Zone Integration

ABSTRACT Broadband‐tunable microlasers are crucial light sources in advanced on‐chip photonic systems, including laser displays, wavelength‐division multiplexing (WDM) communications, and optical encryption. However, existing tuning strategies for microlasers typically rely on gain modulation or cavity loss engineering, which often suffer from complex fabrication, low integration density, and poor output directionality. Herein, we propose a novel broadband and continuous wavelength tuning mechanism by integrating a dissipative zone into a wedged Fabry‐Pérot (FP) microcavity. By incorporating a high‐refractive‐index (RI) dissipative region within the wedged cavity, the degree of optical dissipation can be precisely controlled through the pump position, enabling continuous and broadband tuning of vertically emitted laser wavelengths. Leveraging this mechanism, we further demonstrate spectrally programmable microlaser arrays by tailoring the geometry of the dissipative zone. In addition, dynamic wavelength switching is achieved through real‐time structural control of the cavity. This approach eliminates the need for multiple microcavities with different gain materials or losses, offering a promising and scalable route toward highly integrated broadband tunable on‐chip microlasers.