Figure 27

Figure 27: Power transmitted and circulating in a two mirror cavity with input power 1 W. The mirror transmissions are set such that $T1 + T2 = 0.8$ and the reflectivities of both mirrors are set as $R = 1 − T$ . The cavity is undercoupled for $T1 < 0.4$ , impedance matched at $T1 = T2 = 0.4$ and overcoupled for $T1 > 0.4$ . The transmission is maximised in the impedance-matched case and falls similarly for over or undercoupled settings. However, the circulating power (and any resonance performance of the cavity) is much larger in the overcoupled case.