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Optical loss value of beam splitter

The optical loss of a beam splitter varies widely, typically ranging from less than 1% for high-quality dielectric or dichroic splitters to several percent for metallic-coated or uncoated devices. Factors Affecting Optical Loss1. Type of Beam Splitter: Plate beam splitters: Losses arise from reflections at both surfaces and absorption in the coating.

An uncoated N-BK7 plate at 45° incidence can produce ghost reflections around 1% of incident power for a 50/50 split. Cube beam splitters: Cemented cubes generally have low losses, while optically contacted cubes can handle higher power with minimal absorption. Pellicle beam splitters: Extremely thin membranes (~2–5 µm) minimize ghosting but are fragile and limited to low-power applications.

2. Coating Material: Metallic coatings (e.g., aluminum) typically exhibit higher losses due to absorption, often several percent. Dielectric coatings: Multi-layer dielectric coatings can achieve very low losses, often below 1%, with high transmission and reflection efficiency.

Dichroic coatings: Losses are wavelength-dependent but can be negligible within the designed spectral bands. 3. Polarization and Wavelength: Non-polarizing beam splitters are designed to maintain the incident polarization, but s- and p-polarized light may experience different reflection and transmission, affecting effective loss.

Dichroic and polarizing splitters may have minimal loss for specific polarizations or wavelengths but higher loss outside their design range. 4. Incidence Angle: Most plate beam splitters are designed for 45° incidence.

Deviations can increase Fresnel losses and reduce efficiency. Typical Loss ValuesHigh-quality dielectric or dichroic splitters:

Optical loss value of beam splitter

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