As the name suggests, single-mode fiber allows only a single light mode to propagate through its core, typically around 9 microns in diameter. This narrow core ...

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In summary, while a quarter-wave plate converts linear polarization to circular polarization and vice versa, a half-wave plate rotates the polarization direction of the linearly polarized light. The phase shift they introduce—λ/4 or λ/2—is the principal factor that determines their specific applications in optical systems.

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Eyepiece and top part of body tube from compound monocular Science Museum Group © The Board of Trustees of the Science Museum

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Wave plates, also known as retarders, are optical devices used to modify the polarization state of light waves passing through them. They accomplish this by imposing a phase shift between the two principal polarizations of light. The key difference between a quarter-wave plate and a half-wave plate lies in the phase shift they introduce:

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A quarter-wave plate is designed to retard one component of the light by one-quarter of a wave (90 degrees), which results in a phase shift of λ/4. This phase difference changes linearly polarized light into circularly polarized light when the light is incident at a 45-degree angle to the wave plate's optical axis. Conversely, circularly polarized light can be changed into linearly polarized light with the proper orientation of the quarter-wave plate.

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A half-wave plate introduces a phase shift of λ/2 (180 degrees) between the orthogonal polarization components of the incident light. This results in a flip of the polarization direction. When linearly polarized light encounters a half-wave plate oriented such that its polarization is at 45 degrees to the wave plate's axis, the light exits with its polarization direction rotated by 90 degrees. The half-wave plate can rotate the polarization direction of linearly polarized light to any desired angle, depending on its orientation.

Achromatic lenses address chromatic aberrations by combining multiple lens elements with different dispersive properties. This combination ensures that various ...

Microscope resolution is the amount of detail that can be resolved from the light being refracted through a specimen and presented to the observer through a ...

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