Beamsplitter camera

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Plate beam splitters are thin, but not negligibly so. Because of this, the transmitted and reflected beams have different optical path lengths, and there can be some lateral displacement. Also, a “ghost” reflection is sometimes created on the second surface of the plate. Many manufacturers add a small angle in the glass, making them as wedges instead of perfectly parallel windows so the ghost reflections get deflected out of the main beam's path.

Beamsplitter working principle

Laser specifications change over time for many reasons and it causes problems accross all industries. Learn about how laser output measurement solves numerous problems in YOUR industry. Download the guide below.

Polarizingbeamsplitter principle

To create a cube beam splitter, a cube of transparent material is split in two diagonally. A specially selected semi-reflective coating is applied at the juncture between the two halves, which are then glued back together. This allows for a semi-reflective mirror of negligible thickness, thereby eliminating ghost images and image displacement.

Thanks to their simple design, polka-dot beam splitters are compatible with a very broad range of wavelengths and function well with any reasonable angle of incidence.

Plate beam splitters are thin windows coated with a semi-reflective coating. They are optimized for specific angles of incidence (usually 45 degrees), and can be manufactured with a variety of transmission and reflection ratios. They are usually not too wavelength-dependent, which limits the amount of chromatic aberration they induce.

Woodbeam splitting

Beam splitters are also commonly used in interferometry, the most famous example being the famous Michelson-Morley experiment, which proved that light propagates at the same speed no matter the direction.

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Laser power detector for measurement up to 50 000 W that traps > 97 % of the incident light and handles high intensities of small beams.

However, it is possible to “split” the beam into more exotic configurations using diffraction gratings. One surprising example is the diffraction gratings included as a security feature in Canadian money. If light is shone through them, the resulting pattern will write the denomination of the bill.

Some beam splitters are also called "beam samplers" or "optical pick-offs" when the reflected beam is a very small fraction of the transmitted beam. They sample a laser beam while it is in use, allowing for real‑time beam diagnostics.

Because industrial and scientific applications have varied requirements, many different beam splitter designs have been invented over the years. Let us go through the main ones, taking note of their main advantages and disadvantages.

Beam splitters usually have just two output ports. One for the transmitted beam, and one for the reflected beam. The beam splitter industry’s focus has therefore understandably gone to this use case.

Many small mirrors are placed on a transparent surface, such that only half of the surface is covered. Therefore, half of the light goes through, while the other half is reflected. By putting more or less mirrors, other splitting ratios can be achieved.

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BeamSplitter price

Laser specifications change over time for many reasons and it causes problems accross all industries. Learn about how laser output measurement solves numerous problems in YOUR industry. Download the guide below.   Gentec-EO's high-accuracy laser beam measurement instruments help engineers, scientists and technicians in all sorts of laser applications from the factory to the hospital, laboratory and research center. Learn about our solutions for these measurement types: Laser power meters Laser energy meters Laser beam profilers Terahertz power meters

Gentec-EO's high-accuracy laser beam measurement instruments help engineers, scientists and technicians in all sorts of laser applications from the factory to the hospital, laboratory and research center. Learn about our solutions for these measurement types:

Beam splitters are optical components that partially reflect a laser beam, so the initial laser beam is split in two: a reflected beam and a transmitted beam.

BeamSplitter Teleprompter

At Gentec-EO, we designed beam samplers for high-power laser beams, based on the plate beam splitter principle. Using two uncoated glass wedges to achieve very high damage thresholds, the BA samplers divert a very small fraction of the laser beam to the output port, while maintaining the laser beam's original polarization and profile. This is the only beam splitter type we manufacture, but our expert staff uses many different beam splitting technologies routinely for internal purposes and will be happy to help should you have any questions.

Because the small mirrors are often round in shape, these types of beam-splitters are often nicknamed “polka‑dot” beam splitters.

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However, they tend to be less resistant than plate beam splitters for high optical powers and are usually not suggested when non-collimated beams are at play.

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Beam splittingtypes

Conventional beam splitters have a partially reflective surface. Depending on the angle, wavelength and polarization of the incident light, the transmission and reflection ratios will vary.

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Beamsplitter operator

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In addition, the fact that the reflective surface is safely enclosed in the middle of a cube means that cube beam splitters are typically quite resistant, making them well-suited to more rugged environments.

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Portable laser power meter for up to 250 W with flexible calibration options so the customers only pay for what they use. Includes 3 measurement modes : SSP, CWP and SSE.