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The output beam of a GaAs laser typically has an elliptical shape with an aspect ratio in a range of 2:1 to 4:1. For certain applications, a circular output beam (aspect ratio of 1:1) is desirable.
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Using Holographic Optical Element for Reducing Aspect Ratio of Gaas
The output beam of a GaAs laser typically has an elliptical shape with an
aspect ratio in a range of 2:1 to 4:1. For certain applications, a circular output
beam (aspect ratio of 1:1) is desirable.
It is proposed that a linear holographic optical element or grating be mounted
on the GaAs laser. The aspect ratio of the first order beam produced by the
holographic optical element could be reduced considerably.
An index matching fluid could be used to partially match indices and reduce
reflection losses. Reflection losses at the upper surface would be nominal as P-
polarization reflection would be nearly zero.