| 摘要 |
<p>An optical configuration to illuminate an etalon (79) in a laser wavemeter (120) with a minimum level of light intensity. The system includes optical components to direct a portion of the laser output beam representing the entire cross section of the beam, through an etalon (79) positioned in an etalon housing, and onto a photodetector (180). A first lens (400) condenses the size of the beam sample, and a second lens (402) re-collimates the beam which then passes into the etalon housing, ensuring that all of the spatial components of the beam are adequately sampled. A diffractive diffusing element (406) is incorporated into the optical path. In a preferred embodiment, the diffractive diffusing element (406) is placed within the etalon housing. In another preferred embodiment, the diffusing element (406) is located up stream but outside the housing in the optical path.</p> |
