Fig. 2

Decay rate of the cavity and the CPA. a Effects of the pin lengths of ports 1 and 2 on port-induced decay rates κ _i (i = 1, 2) and the total decay rate κ _c of the cavity mode. When the length decrements of the pins are adjusted to be large enough, κ _c tends to a constant and the intrinsic loss rate κ _int is then evaluated. At the data points marked by blue and red arrows for ports 1 and 2, we observe the CPA. Inset: The sketch for tuning the pin in a port of the cavity. b Total output spectrum measured at x = −3 mm by sweeping the static magnetic field at Δϕ = 0 and q = 1.23