| 摘要 |
A stable multi-fold telescopic resonator (20) is applied to a slab laser to provide a high power laser beam (26) of a high optical quality. The current invention could be applied to both waveguide and free-space slab lasers with either gas or solid state active media. A reduced sensitivity to misalignement is achieved through the use of two short-radii concave folding mirrors forming a nearly-confocal or confocal optical resonator. In order to obtain a nearly-symmetrical output beam profile from the large thickness slab lasing medium (31), the resonator includes a slit diaphragm(s), positioned between the slab and resonator mirrors and aimed to eliminate higher order laser modes in the direction transverse to the plane of the slab. Furthermore, a three mirror multi-fold telescopic resonator is provided by substituting one of the resonator mirrors with a surface of one of the folding mirrors. Also a four-mirror multi-fold telescopic resonator with the on-axis confocal or near-confocal folding mirror alignment is provided to cover a very large area slab lasing media.
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