Thermal self-focusing of sawtooth waves

The thermal self-focusing and defocusing of sawtooth waves are investigated. The geometric acoustic approximation and the assumption of the absence of aberrations of the self-induced lens are employed. Calculations are made of the characteristic time and space dimensions of the process and of the wave amplitude and the beam width. A comparison is made of the specificity of the effects with the familiar thermal self-focusing of quasi-harmonic waves.