Definition of beamsplitter coatings

Edmund Optics - Manufacturing Services 8/24 LB

Photonics Dictionary

beamsplitter coatings: Beamsplitter coatings are specialized optical coatings applied to glass or other substrates to split incident light into two or more separate beams, typically by reflecting a portion of the light while transmitting the remainder. These coatings are designed to control the ratio of reflected to transmitted light across a specific range of wavelengths, angles of incidence, and polarization states.

Key characteristics and functionalities of beamsplitter coatings include:

Reflectance and transmittance: Beamsplitter coatings are engineered to achieve specific reflectance and transmittance ratios. For example, a 50/50 beamsplitter reflects approximately 50% of incident light and transmits the remaining 50%.

Wavelength range: They are designed to operate effectively over specific wavelength ranges, making them suitable for applications in visible, infrared, or ultraviolet spectrums.

Angle of incidence: The performance of beamsplitters can vary with the angle at which light strikes the surface. Coatings may be optimized for normal incidence or for use at specific angles relevant to the optical system.

Polarization sensitivity: Some beamsplitter coatings are designed to be polarization-dependent, meaning their splitting efficiency varies with the polarization state of incident light.

Durability: Beamsplitter coatings are engineered to be durable and resistant to environmental factors such as humidity, temperature fluctuations, and mechanical abrasion.

Applications: Beamsplitter coatings are used in a wide range of optical systems and devices, including microscopy, interferometry, spectrometry, laser systems, and optical communications. They play a critical role in dividing and directing light paths within these systems while preserving optical quality and minimizing losses.

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