| 摘要 |
The present invention relates to an optically pumped waveguide laser (2) comprising a waveguide with an optical propagation layer (3, 4) and two resonator mirrors (6, 7). The propagation layer (3, 4) consists of a gain medium at least along a section of said waveguide, said gain medium allowing up-conversion or down-conversion of incident pump light. One of the resonator mirrors is at least partially transparent to the pump light so as to allow end-pumping of the waveguide laser through a first end face (8) of the waveguide. The propagation layer (3, 4) has a geometrical width which is reduced in a first section of the waveguide, starting from the first end face (8) towards a second end face (9), thereby increasing an energy density of the incident pump light when propagating in the first section towards the second end face (9). In the proposed waveguide laser, the pump light is concentrated in the first section of the waveguide, resulting in a higher energy density which lowers the laser threshold and increases the efficiency. The propagation layer (3, 4) is surrounded by a cladding material (5) having a lower refractive index than the propagation layer (3, 4).
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