DISC LASER (VERSIONS) Russian patent published in 2016 - IPC H01S5/04 H01S3/94 

FIELD: physics, optics.

SUBSTANCE: invention relates to laser engineering. The disc laser consists of an optical cavity with a first optical axis, an active plate having a first surface and a second surface, placed inside the optical cavity and mounted on a cooling substrate by its first surface, a pumping laser, a pumping laser radiation focusing system and a multi-pass optical pumping system. The pumping system is a semi-concentric cavity with a single external reflector with a concave mirror surface, having a second optical axis and characterised by a focal distance where at double the focal distance from the external reflector, perpendicular to the second optical axis, there is a reflecting layer and a mirror coating of the a flat reflector. The focusing system is placed between the pumping laser and the active plate such that the radiation beam of the pumping laser is directed towards the plate at an incidence angle greater than half the bean convergence angle, and is focused into an excitation spot near the point of intersection of the second optical axis and the second surface of the active plate, excluding said point. The centre of the excitation spot lies at a distance from said point which is greater than a quarter of the diameter of beam of the pumping laser at twice the focal distance from the excitation spot.

EFFECT: simple device, higher reliability of the device and a wider spectral range owing to reduced heating of the active heterostructure.

15 cl, 8 dwg