PENTA PRISM

Penta Prisms deviate a beam by 90。without inverting or reversing the image. These prisms also have the property of constant deviation, which means that the 90。deviation angle applies to all rays transmitted by the effective aperture, regardless of their angle with respect to the optical axis. Penta prisms are thus very useful in applications where prism orientation cannot be precisely controlled.
Due to the geometry of penta prisms, the reflecting surfaces due not utilize total internal reflection and must be coated with a metal or dielectric coating.

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DOVE PRISM

Dove Prisms are used as image rotators in a variety of optomechanical systems. They are a truncated form of the right angle prism, and use total internal reflection (TIR) to produce an inverted image which emerges from the exit surface without deviation. As the prism is rotated about its optical axis, the image will rotate at twice the angular rate of the prism. Since the length of the prism is approximately four times the height, the incident light must be parallel or collimated.
For applications in which the hypotenuse cannot be kept sufficiently clean for TIR, a metal or dielectric coating can be applied to the hypotenuse.

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EQUILATERAL DISPERSING PRISMS & ISOSCELES BREWSTER PRISMS

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PLANE WINDOWS

Plane Windows are used as substrates for a variety of applications, such as laser window, output couplers, beamsplitters, beam combiners, mirrors, dichroic filters and plate polarizers. Considerations in selecting window substrates include transmission range, absorption coefficient, incident laser power density and environmental factors such as pressure, temperature, moisture, abrasion and corrosion. Plane Windows listed under UV / VIS / NIR substrates are specified for applications involving coating wavelengths 193nm ≤ λ〈2.0 μm. Units for these substrates are given in mm. Plane Windows listed under IR substrates are specified for applications involving coating wavelengths λ≥ 2.0 μm. Units for these substrates are given in inches.
Refer to the THIN FILM COATINGS section for information on coatings that can be applied to these substrates.

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