optical cavityn. a volume delimited with reflective boundaries within which electromagnetic radiation undergoes repeated internal reflection; esp. one designed to give constructive interference for a particular frequency of radiation, as in a laser.
ΚΠ
1962 Science 13 July 73 (advt.) The elliptical optical cavity gives high pumping efficiency.
1997 Nature 6 Nov. 17/3 One consequence of this giant Kerr nonlinearity is that an optical cavity can be controlled by single photons.