Beam Splitter Mirror For Interferometry Beamsplitters

A beam splitter mirror is an optical device that separates an incident light beam into two or more separate beams. Beam splitters typically use half-silvered mirrors or other semi-transparent materials to split a beam of light into reflected and transmitted components, each containing a portion of the light energy. Some typical applications include interferometry, fluorescence microscopy, spectroscopy, and OCT imaging.

 

We provide beam splitters that can achieve any split ratio from 50/50 to 95/5 for optimizing light distribution to your application needs. Our non-polarizing beam splitters have broad spectral coatings for full visible to near-infrared range operation, while ultra-broadband and polarizing beam splitters are also available for more specialized uses. We take pride in customizing each beam splitter to your needs, whether a standard plate beam splitter or a more complex design. Our application engineers work with your team to specify the optimal solution, and we build trusted long-term partnerships with clients.

 

Please contact us today to discuss how we can optimize a beamsplitter solution for your interferometer, laser system, microscope, or other precision instrument. We look forward to becoming your trusted supplier of high-quality optical components.

 

Features

- Precise split ratio

- Tint-free/ Color Neutral/ Optically Clear

- Low optical loss

- Equal beam deviation

- High damage threshold

- Minimal wavefront distortion

 

Parameters

Product Name	Beam Splitter Mirror
Substrate	B270 or custom
CWL	400-700nm
AOI	45°
Dimension	15*15*1.2 or custom
Diameter Tolerance	±0.1mm
Thickness	1.2mm ±0.1mm
Transmittance	70%
Reflective	30%
Surface Quality	60/40
Parallelism	<1 arc min
Surface Accuracy	λ/4 @632.8nm

 

 

Spectrum Transmission Curve

 

Applications

Beamsplitter mirrors enable many applications that require separating, manipulating, recreating, and measuring light. They are a fundamental component for controlling optical paths and signals. Principles like interferometry, spectroscopy, and optical switching depend on beamsplitters to function.

- Interferometry

- Optical microscopy

- Spectroscopy

- Laser applications

- Optical imaging

- Fiber optics

- Metrology

 

Which optical devices spread light apart?

Apart from the beam splitter mirror we’ve introduced, several other optical devices are used to spread or disperse light into its component wavelengths. Some typical light-dispersing devices include:

 

• Prisms - When white light enters a prism, the wavelengths are separated due to differences in the refractive index for different colors. Shorter wavelengths (blue) are bent more than longer wavelengths (red). This results in the beam of light spreading out into the visible spectrum. Dispersing prisms are used in instruments like spectrometers and spectrophotometers.

 

• Diffraction gratings - A diffraction grating contains thousands of closely spaced slits or grooves that diffract different wavelengths of light at varying angles. Shorter wavelengths spread apart more than longer wavelengths, dispersing the light into the spectrum. Diffraction gratings are a vital component of spectrometers and other devices for measuring wavelength and intensity.

 

• Refractive lenses - Convex lenses slightly disperse white light due to differences in refraction for different wavelengths. While less than a prism, the effect is measurable and used in some spectrometer designs. A lens focuses each wavelength to a marginally different point, resulting in some degree of light dispersion. Two thin convex lenses, known as a lens doublet, increase distribution.

 

• Reflective diffraction gratings - Some gratings use reflection instead of transmission, with grooves or slits etched into a mirrored surface. They operate similarly to transmissive gratings but can achieve higher dispersion in more compact designs. Reflective gratings are found in high-resolution spectrometers.

 

• Grisms - A grism combines a prism and grating into a single optical element, designed to provide dispersion without strongly deviating the light path. The grating on one or more prism surfaces augments the distribution while the prism re-aligns the dispersed light to nearly the same output direction as the input. Grisms allow dispersion without overly long optical paths.

 

• Echelle gratings - An echelle grating uses a coarse, steeply angled grind to overlap multiple spectrum orders. It provides higher resolution and dispersion than a single-order diffraction grating. Echelle gratings are typical in high-performance astronomical spectrometers.

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