Off-Axis Parabolic Mirrors
Featured Product from Avantier Inc.
Choosing an Off-Axis Parabolic Mirror
Key parameters of an off-axis parabolic mirror are the off-axis angle (OAA), the off-axis distance (OAD), and the focal length.
Choose an appropriate OAP mirror by deriving the desired reflected focal length from your desired beam diameter. The small angle approximation leads to a very simple relationship between these two parameters:
Beam Diameter = 2 x sin(Θ) x Reflected Focal Length
Where Θ is the divergent half-angle of the incident light. In fiber optics, when collimating from an optical fiber, you may replace sin(Θ) by NA (fiber).
Manufacturing Capabilities
| Material | Aluminum |
| Diameter | 0.4~600mm |
| Diameter tolerance | +0, -0.2mm |
| Focal length tolerance | +/- 1 % |
| Off-axis distance tolerance | +6, -0mm |
| Clear Aperture | 95% |
| Surface roughness | R5nm |
| Surface accuracy | 1/10 lambda RMS |
| Surface Shape | 1/8λ |
| Surface Quality | 60-40 |
| EFL | 1.29~16000mm |
Commonly Used Specifications
| Type | 15° Off-Axis | 30° Off-Axis | 45° Off-Axis | 60° Off-Axis |
| Diameter | 25.40mm | 50.80mm | 25.40mm | 50.80mm |
| Effective Focal Length (EFL) | 387.60mm | 54.45mm | 148.79mm | 135.45mm |
| Y Offset | 3.95mm | 27.20mm | 4.14mm | 4.62mm |
*Other specific angles, sizes and custom coatings are available upon request
Coating Specifications
| Material | Range(um) | % Reflection |
| Protected Aluminum | 0.4-0.7 | 85 |
| Protected Aluminum | 0.4-2.0 | 90 |
| Enhanced Aluminum | 0.45-0.65 | 95 |
| UV Enhanced Aluminum | 0.25-0.45 | 89 |
| UV Enhanced Aluminum | 0.25-0.70 | 85 |
| Protected Gold | 0.7-2.0 | 96 |
| Protected Gold | 2.0-10.0 | 96 |
| Bare Gold | 0.7-0.8 | 94 |
| Bare Gold | 0.8-2.0 | 97 |
| Bare Gold | 2.0-12.0 | 98 |
| Protected Silver | 0.45-2.0 | 98 |
| Protected Silver | 2.0-10.0 | 98 |
| Ultrafast Ehanced Silver | 0.6-1.0 | 99 |
If you are looking for stock Off-Axis Parabolic Mirrors, visit Stock–Off–Axis Parabolic Mirrors.
Related Content
Case Study – Large OAP Mirrors
Enhancing Telescope Image Clarity with Parabolic Mirrors
Choosing Between Parabolic and Spherical Mirrors
OAP Mirrors: Applications Across Industries
Precision Fabrication and Integration of Off-Axis Parabolic Mirrors
