Article Overview
A beam splitter divides an incident light beam into reflected and transmitted beams, typically at a 45° angle of incidence.
Conceptual Schematic
A simple schematic of a beam splitter can be represented as:
CodeCopy Incident Beam | v ┌─────────┐ │ │ │ Beam │ │Splitter │ │ │ └─────────┘ / / Reflected Beam Transmitted Beam
- Incident Beam: The incoming light directed toward the beam splitter.
- Beam Splitter: The optical element (cube, plate, or pellicle) that partially reflects and partially transmits light.
- Reflected Beam: The portion of light reflected at a 90° angle from the incident beam.
- Transmitted Beam: The portion of light that passes through the splitter along the original direction.
Types of Beam Splitters
- Cube Beam Splitter: Made from two right-angle prisms cemented together, with one hypotenuse coated to reflect part of the light. Provides equal optical path lengths for both output beams, ideal for interferometry .
- Plate Beam Splitter: A thin glass plate coated on one surface, typically used at 45° AOI. May require a compensation plate to match optical path lengths .
- Polarizing Beam Splitter: Uses birefringent materials to separate light into orthogonal polarization states, reflecting S-polarized light and transmitting P-polarized light .
- Half-Silvered Mirror: A thin metallic coating on glass that partially reflects and partially transmits light, often used in photography or low-power laser applications .
Notes on Schematic Representation
- The angle of incidence is usually 45° for standard beam splitters.
- R/T ratio (Reflectance/Transmittance) determines how much light is reflected versus transmitted. For a 50/50 splitter, half the light is reflected and half transmitted .
- In diagrams, arrows indicate the direction of light, and the splitter is often drawn as a square or rectangle with a diagonal line representing the reflective coating. For more detailed visual diagrams, Wikimedia Commons hosts a collection of beam splitter schematics showing cube, plate, and polarizing designs .
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