Intracavity Light Field Shaping by Micro‐Optics Integrated Inside Fabry‐Pérot Microlasers

ABSTRACT Miniaturized lasers with tailored lasing modes are critical for integrated photonics, demanding their high‐level integration and 3D or multi‐dimensional designability. Here, we demonstrate the intracavity light field modulation by integrating micro‐optics into Fabry‐Pérot (FP) microcavities using two‐photon‐lithography. Synergistic modulations of the internal element geometry and cavity configuration provide adjustable and stable resonance control. The quality factor of focusing micro‐optics integrated microcavity is up to ∼ 5.8 × 10 5 from ∼ 10 3 in plane‐parallel FP microcavities, while decreasing lasing thresholds to ∼ 0.3–2.5 µJ·mm −2 . The microlaser with an intracavity axicon generates stable Bessel‐Gaussian beam with a ∼ 150 µm non‐diffraction distance. A 2D Hermite‐Gaussian mode selector with indices up to 19 is implemented by off‐axis pumping. As a proof of concept, the biomimetic all‐optical displacement perception inspired by biologically hair sensilla reaches a sensitivity of up to −1.13 nm·µm −1 . Its deep‐learning‐driven recognition based on lasing mode images is explored to obtain an accuracy over 88.94%. This work may promise small lasers with freely designed compact configurations and improved performance for diverse integrated applications.