For an [Optical cavity](Optical%20cavity.md) (shown below) we define [stability](Stability%20parameters%20of%20optical%20cavities.md) parameters, $g_1$ and $g_2$ where $g_1=1-\frac{d}{R_1}\;\;\;\; \mbox{and}\;\;\;\; g_2=1-\frac{d}{R_2}$ where $d$ is the distance between the cavity mirrors and $R_1$ and $R_2$ are the radii of curvature for each mirror.  These parameters are used to define the stability condition $0<g_1g_2<1$ # Derivation of optical cavity stability parameters ## Gaussian beam analysis #Electromagnetism/Optics