Anamorphic Prism
Anamorphic Prism
An anamorphic prism pairis a pair of prisms which is usually used for reshaping the profile of a laser beam. For example, the elliptical beam from a laser diode can be transformed into a beam with circular cross-section, as is needed for many applications, by using an optical prism pair as a prism beam expanderfor only one direction (e.g., the horizontal one). Of course, one can also just modify the ellipticity, or convert a circular beam into an elliptical one.
Anamorphic PrismDescription
Diode lasers usually have elliptical beam profiles. In most cases, though, the shape of the circular beam is required, such as pattern matching with the external resonator to make the beam size adapt to the small aperture through the isolator. A deformed pair of anamorphic prismsis used to transform an elliptical laser diode beam into an approximately circular beam to amplify an elliptical beam in one dimension.
Anamorphic Prism Specifications
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Material |
SF11 |
|
Dimension Tolerances |
+0.0, -0.2 mm |
|
Surface Flatness |
<λ/8 @ 632.8 nm |
|
Surface Quality |
60-40 scratch & dig |
|
Theta Angle |
29°27' ± 3" |
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Clear Aperture |
> 85% in central circular dimension |
|
Coating |
MgF2 single layer on perpendicular surface |
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