Whispering-gallery-mode (WGM) microcavities has emerged as a promising alternative to traditional probes, offering high sensitivity and wide bandwidth. In our research, we propose a novel silicon dioxide WGM microprobe device, with impressive Q factors up to 107. With a sensitivity of 5.4 mPa√Hz and a bandwidth of 41 MHz at -6 dB, we have successfully conducted photoacoustic imaging on various samples using this device. What’s more, it can measure the resonance spectrum of microparticles by contact. Meanwhile, our compact and lightweight device exhibits waterproof, corrosion-resistant, and pressure-resistant properties by encapsulating in a 2 mm aluminum case which shows significant application potential in photoacoustic endoscopic detection, near-field ultrasonic detection and other aspects.
We implement sub-Hz-level instantaneous linewidth (70dB linewidth compression) laser source by self-injection locking to a high-quality-factor (⪆10e8) WGM microresonator module with locking time of more than 24 hours. We independently developed a few mode, high-quality-factor micro-cavity module which directly integrated with DFB chip. The entire optical module can be packaged to enhance robustness, making it truly commercialized and compatible to industrial optical systems.
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