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# Off-Axis Parabolic First Surface Metal Mirrors

 Surface Roughness Down to 50Å RMS
 Interferometrically Tested
 Solid Metal Design and No Adhesives for Best Thermal Conductivity
 Free of Chromatic and Spherical Aberration
 In-House Design, Manufacturing, and Coating Capabilities Available for Custom Requests
 In Stock for Immediate Delivery
 ITAR Design Capabilities

Off-Axis Parabolic Metal Mirrors are widely used in broadband UV, Visible, and IR applications. Unlike transmissive optics where the material properties greatly affect performance, off-axis parabolic mirrors (OAPs) are not wavelength dependent and therefore free of aberrations across a broadband range. These benefits make OAPs ideal for use in instrumentation and laser systems including Schlieren, MTF, FLIR, and FTIR, along with IR lasers such as Quantum cascade lasers. Off-axis parabolic mirrors allow for unrestricted access to the focal point allowing for compact system designs. Our Metal Substrate Mirrors are available in 15°, 30°, 45°, 60°, or 90° Off-Axis options with several coatings including Bare Gold and Enhanced Aluminum.

## Surface Roughness Down to 50Å for Minimized Scatter

TECHSPEC® Off-Axis Parabolic (OAP) Mirrors are designed and manufactured by Edmund Optics® for low scatter from the UV to IR spectra, with a surface figure of λ/8 RMS and a surface roughness of less than 50Å RMS. A variety of coating options are available including Protected Gold, Bare Gold, Protected Aluminum, UV Enhanced Aluminum, and Protected Silver. Each mirror undergoes inspection to ensure low scatter. OAPs are ideal for focusing, collimation, beam expansion, and optical testing systems such as MTF test benches.

## Diagrams and Equations

##### Figure 3: (Left) Ellipsoid Diagram, (Right) Off-Axis Parabolic Diagram
$$4 \, C^2 = f_1 ^2 + f_2 ^2 - 2 \, f_1 \, f_2 \, \cos{\theta} \quad \quad \quad y = \frac{x^2}{4 \, \times \, \text{PFL}}$$

## Training Materials

Roughness of Diamond
Turned Off-Axis Parabolic Mirrors

Introduction to Metallic Mirror Coatings

Understanding
Surface Quality

Off-Axis Parabolic Mirror Selection Guide

## FAQ's

What focal lengths are available?
Our standard offering of Off-Axis Parabolic Mirrors starts at 6.35mm (0.25”) reflected focal length, while the longest reflective focal length offered is 516mm (20.3”).
What wavelength range do Off-Axis Parabolic Mirrors cover?
The wavelength range for Off-Axis Parabolic Mirrors are determined by the coating on the mirror. Currently there are three different coatings available: protected aluminum, protected gold, and bare gold, covering 400nm to more than 12000nm. The upper limit is set by the material property of the gold coating in combination with the gold thickness.
What materials are available?
Our Off-Axis Parabolic Mirrors are made out of Aluminum 6061T6.
What coatings are available?
We offer Protected Aluminum, UV Enhanced Aluminum, Protected Silver, Bare Gold, and Protected Gold coatings.
Can you make ellipsoid shaped metal mirrors?
We do not have a standard catalog offering of ellipsoid mirrors, but custom versions are available upon request.
What design parameters should I use for a custom Off-Axis Parabolic Mirror?
The design parameters required to make a cost efficient custom Off-Axis Parabolic Mirror are the reflected focal length, reflected angle, the tolerance for the focal point and the reflected wavefront distortion.
What design parameters should I use for a custom Ellipsoid?
The design parameters required to make a cost efficient custom Ellipsoid Off-Axis Parabolic Mirror are the focal length of the two reflected beams, as well as the angle between them, along with the tolerance of one of the focal points, as well as transmitted wavefront distortion.
Are OAP with central holes available?
Off-Axis Parabolic Mirrors with central holes are available upon request.
What size options are available?
We offer OAPs with diameters of ¼” (6.35mm), ½” (12.7mm), 1” (25.4mm), 2” (50.8mm), 3” (76.2mm), and 4”(101.6mm).

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