Fig. 5: Review of ultrastable laser systems with an FP cavity.
From: Harnessing micro-Fabry–Pérot reference cavities in photonic integrated circuits
In ref. 2, free-space optics are used for PDH locking to a vacuum-housed 8-ml FP cavity. In ref. 10, free-space optics are used for PDH locking to a vacuum-gap 9.6-ml FP cavity. In ref. 35, fibre optics are used for PDH locking to a vacuum-gap 2-ml FP cavity. In ref. 16, free-space optics are used for SIL to an air-gap 0.5-ml FP cavity. Here we demonstrate SIL to a vacuum-gap 0.56-ml FP cavity on an integrated platform (solid green). Additionally5,11, we propose PDH locking to a vacuum-gap 0.56-ml FP cavity on an integrated platform. A fully co-integrated μFP is presented in this work. The dashed green circle indicates the envisioned noise performance of on-chip PDH locking in this platform.
