These lenses are thicker at the edge than in the centre and flat on one side and are used to expand light beams or to increase focal lengths in optical systems. They are often employed for beam expansion of high peak power pulsed lasers. A beam incident on a concave surface will be focused to a point outside the instrument.
|Material||BK7, UV FS, CaF2|
|Centration Error||≤3 arc min.|
|Focal Length Tolerance||±2%|
|Clear Aperture||>90% of diameter|
|Coating||Upon customer request|