The behavior of

-switched laser-pulse shapes caused by various optical nonlinearities within the optical resonator is treated with an extended version of the Statz-de Mars equations. The importance of

-switch time behavior together with optical nonlinearity is shown by means of waveforms calculated at selected values of essential parameters, and good qualitative correspondence with a wide variety of relevant experimental observations is reported. A method of estimating some of the qualitative effects of parameter variations is described, providing an alternative to computer calculations when full details are not required.