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Wedge Prism
The wedge prism can be used to individually deflect a laser beam by a certain angle or combined with another wedge prism for beam deviation purposes. A single prism can shift the incident beam by a specific angle. When two wedge prisms are used together, they can function as deformable prisms to correct the elliptical beam output of a laser tube or to deflect the beam at various angles within a 4θ range, where θ represents the deflection angle of a single prism. This beam shaping is achieved by independently rotating the two wedge prisms, making it ideal for beam scanning at different positions in imaging applications.

Features of Wedge Prism
The characteristics of wedge prisms include their very small apex angle (typically less than 1/10 radian), which results in minimal deflection of light as it passes through, regardless of the angle of incidence. In optical instruments, two wedge prisms are often combined and rotated relative to each other to produce different deflection angles or to convert the minimum deflection angle of light into the relative rotation angle of the two prisms. This setup is used to compensate for small angular deviations in the measurement of light. Such prisms find applications in many optical instruments, including military rangefinders and camera viewfinders.
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