Off-Axis Parabolic Mirrors with Metallic Coatings

Mirrors are an important part of optical applications. They are commonly used to fold or compact an optical system. Standard and precision flat mirrors feature metallic coatings and are good all-purpose mirrors that come in a variety of substrates, sizes and surface accuracies. They are a great choice for research applications and OEM integration. Laser mirrors are optimized to specific wavelengths and use dielectric coatings on precision substrates. Laser mirrors feature maximized reflection at the design wavelength as well as high damage thresholds. Focusing mirrors and a wide variety of specialty mirrors are available for customized solutions.

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Paralight Optics’ optical mirrors are available for use with light in the UV, VIS, and IR spectral regions. Optical mirrors with a metallic coating have high reflectivity over the widest spectral region, whereas mirrors with a broadband dielectric coating have a narrower spectral range of operation; the average reflectivity throughout the specified region is greater than 99%. High performance hot, cold, backside polished, ultrafast (low delay mirror), flat, D-shaped, elliptical, off-axis parabolic, PCV cylindrical, PCV Spherical, right angle, crystalline, and laser line dielectric-coated optical mirrors are available for more specialized applications.

Off-Axis Parabolic (OAP) Mirrors are mirrors whose reflective surfaces are segments of a parent paraloloid. They are designed to focus a collimated beam or collimate a divergent source. The off-axis design makes the focal point to be separated from the optical path. The angle between the focused beam and the collimated beam (off-axis angle) is 90°, the propagation axis of the collimated beam should be normal to the bottom of the substrate to achieve a proper focus. Using Off-Axis Parabolic Mirror does not produce spherical aberration, color aberration, and eliminates the phase delay and absorption loss introduced by the transmissive optics. Paralight Optics offers off-axis parabolic mirrors available with one of four metallic coatings, please check the following graphs for your references.

Features:

Material Compliant:

RoHS Compliant

Round Mirror or Square Mirror:

Custom-made dimensions

Coating Options:

Aluminum, Silver, Gold Coatings Available

Design Options:

Off-Axis Angle 90° or Custom Design Available (15°, 30°, 45°, 60°)

Common Specifications:

pro-related-ico — Reference Drawing for

Off-Axis Parabolic (OAP) Mirror

Parameters

Ranges & Tolerances

Substrate Material

Aluminum 6061
Type

Off-Axis Parabolic Mirror
Demension Tolerance

+/-0.20 mm
Off-Axis

90° or Custom Design Available
Clear Aperture

> 90%
Surface Quality (Scratch-Dig)

60 - 40
Reflected Wavefront Error (RMS)

< λ/4 at 632.8 nm
Surface Roughness

< 100Å
Coatings

Metallic coating on curved surface
Enhanced Aluminum: Ravg > 90% @ 400-700nm
Protected Aluminum: Ravg > 87% @ 400-1200nm
UV Protected Aluminum: Ravg >80% @ 250-700nm
Protected Silver: Ravg>95% @400-12000nm
Enhanced Silver: Ravg>98.5% @700-1100nm
Protected Gold: Ravg>98% @2000-12000nm
Laser Damage Threshold

1 J/cm² (20 ns, 20 Hz, @1.064 μm)