| 摘要 |
An apparatus for providing pump light of a first wavelength λ1 to a laser that emits a second wavelength λ2 has first and second lasers of the wavelength λ1 to direct light along first and second axes in a first direction. The first and second axes define a first plane P1. To form a composite light beam of wavelength λ1, a filter apparatus has a first filter on a first surface at an oblique angle to the first and second axes and that transmits λ1 and reflects λ2. A second filter on a second surface parallel to the first surface, reflects λ1 and transmits λ2. A third filter formed on the first surface coplanar with the first filter reflects λ1 and transmits λ2. The filter apparatus re-aligns the first and second axes along a second plane P2, orthogonal to P1 and parallel to the first direction. |
