Patent ID: 9685752
Date: 2017-06-20
CPC Classifications: G02B,H01S

Claim:
1. A laser assembly with a converter constituted as a converter fiber laser for generating converted laser output radiation and with a pumping source which delivers pumping radiation for the converter and comprises a plurality of laser diodes generating the pumping radiation, which are each constituted by emitters on laser bars, wherein the pumping source comprises beam-forming optics for forming the laser beams delivered from the emitters into the pumping radiation, wherein the emitters on at least two laser bars are provided following one another in a first axial direction (Y axis) corresponding to a slow axis, and which are disposed with their active layers each in a plane (XY plane) which includes the first axis (Y axis) and a second axis (X axis) normal thereto, are disposed on top of one another in at least one diode laser stack in a third axis (Z axis) which corresponds to a fast axis and which is orientated normal to the first and second axe, and that the beam-forming optics comprises in a beam path following the diode laser stack a first optical device for spreading the laser beams delivered by the emitters of each laser bar in the third axis and, following the first optical device, a second optical device, with which the spread optical beams of all the laser bars are recombined by being pushed on top of one another in the direction of the first axis (Y axis) to form a laser beam bundle and wherein the converter comprises a multilayered converter fiber with an inner active fiber made of a light-conducting material, the converter fiber is accommodated in the interior of a sleeve-like sheathing which extends over an entire length of the converter fiber and through which a liquid cooling medium can flow, wherein the converter fiber comprises a connection at each end thereof for coupling or decoupling the pumping radiation and the converted radiation is provided at both ends of the converter fiber, each of the connections being made of a light conducting material and in a form of an end cap, the end cap extending, for a purpose of cooling, with a partial length into an interior of the sleeve-like sheathing of the converter fiber and each of the end caps are coated with an antireflection layer for the pumping radiation and the converted laser output radiation, and each of the end caps is also connected to the active fiber by means of a splice connection.