Abstract: A laser handpiece, which has an outer guide sleeve in which a light guide is contained, is provided with a releasable clamping device. By the rotation of a rotary ring on the guide sleeve, the clamping device can be released and an advancing of the light guide, either manually or automatically, can be guaranteed.

Abstract: A dental laser treatment instrument comprising a handpiece that is connected to a supply tube for supplying laser radiation and a treatment fluid, and has a long extraction element on the front end thereof, for emitting the laser radiation. The extraction element has a long optical fiber and a cylindrical or sleeve-type holding element which surrounds the optical fiber in a region facing the front end of the fiber, at a distance from said fiber, in order to form a fluid channel. The fluid channel is connected to a supply line extending through the handpiece. According to the invention, the sleeve-type holding element projects past the front optical output end of the optical fiber.

Abstract: In a medical or dental laser instrument (1), especially for tooth root canal treatments, having a preferably rod-shaped hand piece (2), a connection part (3) by means of which the hand piece (2) can be connected to a supply line (4), a first light guide (5) that extends longitudinally through the supply line (4) and the connection part (3) to the hand piece (2), a second light guide (7) arranged in the front end region of the laser instrument, the rear end of the second light guide (7) being arranged coaxially with respect to the front end of the first light guide (5), and a coupling device (8) for coupling the laser light bundle leaving the first light guide (5) to the second light guide (7), the said second light guide (7) has a larger numerical aperture than the first light guide (5).