Is Dichroic Beam splitter in a converging beam generates bad spot in transmitted beam? If so how to get a good one. For an imaging system how to handle the aberrations generated by BS at 45deg when it is placed between the sensor and optics mainly transmitted one?
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45deg Tilted Dichroic Beam splitter in converging beam
Best answer by Mike.Jones
Can you use a cube dichroic beamsplitter rather than a tilted plate? Tilted plates in converging or diverging light introduce additional astigmatic aberrations that cube beamsplitters don’t have.
Another solution is to introduce a second tilted plate with a toroidal front surface and plano rear surface. Optimize both toroid X,Y radii and the tilt angle. Depending on how the first plate is tilted, either the toroid radius or radius of rotation may be set to infinite, making the second plate into a simple very weak cylindrical lens. There are several journal articles on this, such as in Applied Optics, Vol. 54, Issue 7, pp. 1758-1764 (2015).
+3Can you use a cube dichroic beamsplitter rather than a tilted plate? Tilted plates in converging or diverging light introduce additional astigmatic aberrations that cube beamsplitters don’t have.
Another solution is to introduce a second tilted plate with a toroidal front surface and plano rear surface. Optimize both toroid X,Y radii and the tilt angle. Depending on how the first plate is tilted, either the toroid radius or radius of rotation may be set to infinite, making the second plate into a simple very weak cylindrical lens. There are several journal articles on this, such as in Applied Optics, Vol. 54, Issue 7, pp. 1758-1764 (2015).
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