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Ellipsoidal and Paraboloidal Reflectors

Ellipsoidal and Paraboloidal Reflectors
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Ellipsoidal and Paraboloidal Reflectors - 1

O p t i c s 531 Email: sales@newport.com • Web: newport.com TECHNICAL REFERENCE AND FUNDAMENTAL APPLICATIONS LENS SELECTION GUIDE SPHERICAL LENSES CYLINDRICAL AND SPECIALTY LENSES OPTICS SETS OPTICAL SYSTEMS MIRRORS PRISMS Paraboloidal Reflectors SOURCE AT FOCUS Paraboloidal reflectors collect radiation from a source at its focal point and reflect it as a collimated beam, parallel to the axis. Alternatively, they can tightly focus a collimated beam at its focus. Off-Axis Paraboloidal Reflectors Our off-axis paraboloidal reflectors are a circular segment from one side of a full paraboloid. The focal point is off the mechanical axis, giving full access to the reflector focus area. There are no shadowing problems if a detector or source is placed at the focus. Specifications Material Electro deposited nickel Coating Bright rhodium Wavelength Range 200 nm to > 10 ìm Size tolerance ±0.25 mm Surface Quality 80-50 scratch-dig Maximum temperature 350°C WAVELENGTH (ìm) REFLECTANCE (%) 0.2 0.4 0.6 1.0 2.0 4.0 6.0 10.0 0.0 0.2 0.4 0.6 0.8 1.0 BRIGHT RHODIUM Reflectance of bright rhodium Ellipsoidal and Paraboloidal Reflectors These accurately replicated reflectors are designed for many light collection and illumination applications. Their broad spectral range (200 nm to > 10 ìm) makes them usable for applications where lenses are either too costly or are limited by their transmissive properties. We offer parabolas, off-axis parabolas, and ellipses, which all provide very efficient radiation control since focus or collection is over very large solid angles. This makes them particularly useful for lower power incoherent light sources. Ellipsoidal Reflectors These reflectors have two conjugate foci. Light from one focus passes through the other, after reflection. Ellipsoids collect a much higher fraction of total emitted light than a spherical mirror or conventional lens system. The effective collection f/#s are very low, and the geometry is well suited to the small source size of an arc lamp. Two ellipsoids can almost fully enclose a light source and target to provide nearly total energy transfer. • Collect and focus or collimate UV to far IR radiation efficiently • Economical alternative to IR lens materials • No chromatic aberrations • Easily rod mounted Ellipsoidal Reflector Paraboloidal Reflector Off-Axis Paraboloidal Reflector

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