Q-SWITCHED AND MODE-COUPLED LASER Russian patent published in 2013 - IPC H01S3/81 H01S3/108 H01S3/117 

FIELD: physics.

SUBSTANCE: Q-switched laser consists of two end mirrors and two auxiliary mirrors. Between the first end mirror of the cavity and the active element there is an acoustooptical modulator, and in front of the second end mirror there is one or more nonlinear crystals or any transparent material having Kerr-type nonlinearity. The first end mirror, modulator, active element and one of the auxiliary mirrors lie in one arm of the optical cavity and the other auxiliary mirror, one or more nonlinear crystals or any transparent material having Kerr-type nonlinearity and the second end mirror lie in the other arm of the cavity. The first end mirror is in form of a concave sphere of radius R1; the centre of the modulator lies at a distance equal to the radius R1 from the reflecting surface of the first end mirror, and a diaphragm is further placed between the second end mirror and the one or more nonlinear crystal or transparent material having Kerr-type nonlinearity. The operating frequency f of the modulator is equal to (or is a multiple of) half the intermode interval 2f of the laser (2f=c/2L, where c is the speed of light, L is the length of the cavity), and the modulator switching frequency determines the pulse repetition frequency Q-switch (for example, selected in a range from 1 to 100 kHz).

EFFECT: improved output characteristics.

2 cl, 2 dwg