# Bow-tie ring resonator Consider the following bow-tie ring resonator in free-space where $d_1$ is the length between two circular mirrors and $d_2$ is the total path-length between the pair of circular mirrors and a pair of planar mirrors.  ## ABCD matrix ### Accounting for folding angle   #QuantumMechanics/quantumOptics #ExperimentalTools/ExperimentalToolsinOptics/QuantumExperimentalTools/QuantumOpticsExperimentalTools #Electromagnetism/Optics/waveOptics