METHOD AND DEVICE FOR MOVING LASER BEAM NECK Russian patent published in 2011 - IPC G11B7/125 G02F1/29 H01S3/10 

FIELD: physics.

SUBSTANCE: method of moving exit neck while keeping its size constant involves using a two-component laser optical system. The laser optical system has a first movable component at a distance d₁ from the entrance neck, a second movable component at a distance d₂ from the first component and the exit neck. The exit neck lies at a distance d₃ from the second component. Parametres of the laser optical system are linked by the relationships: magnification of the first component defocusing of components focal distance of the second component . Longitudinal distances d₁, d₂ and d₃ are varied according to the following laws: ; Movement of the exit neck with change in the length of the laser optical system is realised according to the following law: where: α is longitudinal magnification of the laser optical system; is focal distance of the first component; Z_k is a confocal parametre, Z_p is the distance from the focus of the first component to the entrance neck; P₀=P(z_pt,Δ_t)=const is the full, characteristic relationship between longitudinal magnification and the current structural parametres.

EFFECT: possibility of moving a constant-size neck in a wide range with small displacement of components of the laser optical system.

2 cl, 2 dwg