Schmidt pechan prismvs roofprism

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The multiple internal reflections also cause a polarization-dependent phase-lag of the transmitted light, in a manner similar to a Fresnel rhomb. This must be suppressed by special phase-correction coatings to avoid unwanted interference effects on the image.

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The prism consists of two glass prisms separated by an air-gap. Multiple total internal reflections of the light cause a vertical flipping of the image; a "roof" section of the second prism also flips the image laterally, together causing a 180° rotation of the image. The image's handedness is not changed.

Compared to the double-Porro prism or Abbe-Koenig designs, the Schmidt-Pechan is much more compact. However, the large number of reflections and glass/air transitions of the light make the prism more lossy than the other designs. Some of the surfaces must be optically coated for efficient internal reflection, since the light is incident at an angle less than the critical angle.

The fast physical optics modeling and design software VirtualLab Fusion enables a fast and accurate simulation of even complex optical systems containing Volume Holographic Gratings by combining specialized solvers for the individual components, such as the Fourier Modal Method in the case of VHGs. Check out the use cases below for an example of an angular-filtering volume grating used in conjunction with a diffractive beam splitter to improve the initial design, as well as an overall introduction on how to configure a volume grating in VirtualLab Fusion.

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We construct an angular-filtering volume grating and apply it in a system to suppress the undesired higher diffraction orders from a beam splitting DOE.

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A holographic volume grating is analyzed by using the Fourier modal method. Both the spectral and angular properties are presented.

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Volume Holographic Gratings (VHGs) are well-known for their high spectral and angular sensitivity combined with adjustable diffraction efficiencies. Hence these gratings are an appropriate tool in optical systems that require accurate spectral and angular filtering. Due to their characteristic three-dimensional and smooth modulation of the refractive index, the modeling can pose numerical challenges, e.g. determining a fine-enough discretization to respect the continuous nature of the refractive-index profile. This can make a simulation of such structures quite demanding computationally, especially when the volume grating is used as just one component in a full, more complex system.

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A Schmidt-Pechan prism is a type of optical prism used to rotate an image by 180°. They are commonly used in binoculars as an image erecting system.