Intracavity dynamics-based gain-assisted sensing with microtubule Raman microlaser

Microcavity lasers show excellent performance as a miniaturized microsensor in various applications. However, their relatively weak power may be easily submerged system noises and disturbed by environmental fluctuations, rendering them ineffective at detecting small signals for precise sensing. To solve this problem, the laser differential frequency-shift feedback technique is demonstrated microtubule Raman to achieve optical gain assistance. When microlaser frequency-shift-modulated returns back resonator, measurement signal can resonate with relaxation oscillation significantly enhanced. The intracavity dynamics-based enhancement makes it effective increasing intensity changes caused analytes. Small that would otherwise buried go undetected more resolved. In addition, reduces spectral range offers way observe fast dynamic response. Based on that, resolution of 50 nm nanoparticle detection limit refractive index noise-limited 8.18 × 10−7 unit (RIU) are demonstrated. phase transition thermosensitive hydrogel further investigated validation its rapid capability. Integrated an inherent microfluidic channel, proposed provides direct interaction between analytes probe light ultrasmall sample consumption down pl. It expected boost microlasers enlighten development optofluidic microsensors exploring diverse biochemical processes.