A typical beam splitter can separate
A typical beam splitter separates an incident light beam into two or more beams, either by splitting the optical power, polarization, or wavelength.
Basic Function
A beam splitter is an optical device designed to divide an incoming light beam into transmitted and reflected components. The splitting can be equal, such as a 50/50 ratio, or unequal depending on the design and application. Some beam splitters also work in reverse, combining two beams into a single output beam .
Types of Beam Splitters
- Non-polarizing beam splitters: Separate light based on optical power, maintaining the original polarization state. They are specified by their reflection/transmission (R/T) ratio .
- Polarizing beam splitters: Split light into orthogonal polarization states, typically reflecting S-polarized light and transmitting P-polarized light. They are characterized by their extinction ratio, which measures the purity of polarization separation .
- Dichroic beam splitters: Separate light by wavelength. Shortpass splitters transmit light below a cutoff wavelength and reflect longer wavelengths, while longpass splitters transmit longer wavelengths and reflect shorter ones. Multi-band splitters can handle three or more wavelength bands .
Construction Types
- Cube beam splitters: Made from two triangular prisms cemented together, often with a partially reflective coating on the hypotenuse. They are widely used in interferometers and laser systems .
- Plate beam splitters: Thin glass plates with a reflective coating on one surface, often used at a 45° angle of incidence. They are lighter, more compact, and less prone to chromatic aberration than cubes .
- Other designs: Include pellicle, crystal, Brewster window, and wedged plate beam splitters, which can create multiple attenuated beams or allow continuous adjustment of the splitting ratio .
Applications
Beam splitters are essential in optical systems such as interferometers, autocorrelators, cameras, projectors, and laser setups. They allow precise control over beam direction, intensity, and polarization, enabling complex optical measurements and imaging techniques .
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