Exposed-In-Place Holographic Laser Collimator/Circularizer Lens
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-29
The diverging elliptical beam produced by a semiconductor diode laser is converted to a collimated circular beam by a holographic optical element on the output window of the laser package. Since the characteristics of the laser and its position relative to the output window varies, the holographic optical element is exposed and processed in place on each laser.