Polarization Beam Splitter ZnSe CaF2 Corner Cube Prism
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Polarization Beam Splitter ZnSe CaF2 Corner Cube Prism Product Overview In advanced Fourier-Transform Infrared (FTIR) spectroscopy, aerospace laser ranging, and high-power CO₂ laser systems, maintaining absolute beam parallelism during polarization modulation is a major system challenge. Our Polarization Beam Splitter ZnSe CaF2 Corner Cube Prism series provides an integrated solution to this optomechanical bottleneck. By implementing high-isolation thin-film polarizers onto the retroreflective geometry of a Corner Cube Prism, these components split an unpolarized input beam into orthogonal s-polarized and p-polarized states, while simultaneously utilizing the corner cube's inherent "retroreflective" property to return the beams exactly parallel to the input axis, regardless of the physical orientation of the prism. To satisfy broad spectral requirements spanning from the Deep-Ultraviolet (DUV) to the Far-Infrared (FIR), our facility manufactures these specialized retroreflectors using two elite crystalline substrates: Zinc Selenide (ZnSe) and Calcium Fluoride (CaF2). Technical Specifications
General Specifications
Product Images Key Performance Benefits
Primary Industrial Applications
Frequently Asked Questions Q1: What unique function does a Polarization Beam Splitter Corner
Cube Prism fulfill that standard cubes cannot? A: A standard polarization cube relies on a fixed 45° internal coating plane. If the cube experiences minor pitch, roll, or vibration, the exit beam shifts immediately, causing downstream alignment failure. A Corner Cube Prism contains three mutually perpendicular reflective faces. By treating these surfaces with advanced multi-layer dielectric films, the prism separates the unpolarized light into s-polarization and p-polarization states, while utilizing its internal three-surface geometry to return the light directly back to its source. This provides high-purity beam splitting that is completely immune to angular mechanical perturbations. Q2: When should an optical engineer specify a ZnSe substrate over a
CaF2 substrate? A: The choice depends heavily on your system's operational wavelength and environment. If your optical pathway centers around the thermal infrared band (8.0 - 14.0μm) or targets high-power CO₂ lasers, ZnSe is mandatory due to its near-zero absorption at those long wavelengths. However, if your application covers the Ultraviolet, Visible, or Mid-Infrared bands (0.13 - 7.0μm), CaF2 is the superior option. CaF2 features a lower refractive index, which reduces reflection losses, possesses higher mechanical hardness, and exhibits significantly higher resistance to laser damage. Q3: How do you protect the sensitive internal interfaces of a ZnSe
or CaF2 composite prism assembly? A: Both ZnSe and CaF2 have specific environmental sensitivities; for instance, CaF2 is slightly hygroscopic, meaning it absorbs moisture over time if left unprotected. To shield the internal Polarization Beam Splitter coatings, our prisms are processed inside Class 100 cleanrooms and hermetically sealed inside an anodized aerospace-grade aluminum housing. All exposed crystalline edges receive hard, diamond-like or oxide-based protective coatings, ensuring complete resistance to humidity, thermal shock, and direct chemical exposure in the field. Q4: What tolerances can your facility hold for dihedral angle error
on these corner cubes? A: The angular precision of the three mutually perpendicular mutual faces determines the overall sharpness of the returned beam. A minor dihedral angle error can cause a single returned laser spot to split into six independent weak reflections. Our precision diamond-lapping and optical-contact bonding procedures allow us to control the dihedral angle accuracy down to less than 1 arc second. This high level of precision guarantees that the returned s- and p-polarized channels maintain crisp spatial profile focus and high power densities over multi-kilometer transmission distances. |
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| Product Tags: CaF2 Corner Cube Prism ZnSe corner cube prism Polarization beam splitter cube |
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