IdealPhotonics' CRDS cavity, a core component of cavity ring-down spectroscopy (CRDS) systems, comprises a precision optical resonant cavity constructed from ultra-high reflectivity mirrors (R≥99.99%). It achieves ultra-high sensitivity detection of trace gases/molecules by extending photon ring-down time (µs-ms level).Key features include fundamental mode ring-down time (τ≥X µs), cavity length stability (ΔY µm/℃), mirror alignment accuracy (≤Z µrad), airtightness (leakage rate ≤A mbar·L/s), and vibration resistance bandwidth (≥B Hz), ensuring ppb-level detection limits and long-term measurement stability.