High-efficiency tunable lasers hybrid-integrated with silicon photonics at 2.0  <b>μ</b>m

We present hybrid tunable lasers at 2.0-μm wavelength, seamlessly integrated within silicon photonic circuits for advanced biomedical applications. Leveraging III/V semiconductor materials for gain and silicon ring resonators for tuning, the laser achieves a tuning range of 25 nm, precise adjustments below 0.1 nm, and a side-mode suppression ratio of 40 dB. This advancement contributes to the progress in photonic integrated circuits beyond the telecommunication wavelength range, offering scalable and cost-effective solutions for enhanced spectroscopic systems within the 2.0-μm wavelength range.