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Off-Axis Parabolic Mirror

Featured Product from Avantier Inc.

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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).

Factory Standards

Material Aluminum
Diameter tolerance +0, -0.2mm
Focal length tolerance +/- 1 %
Off-axis distance tolerance +6, -0mm
Surface accuracy 1/10 lambda RMS
Surface Quality 60-40

OAP Metal Mirrors

Focal Length (m) Diameter, D Thickness, Te (mm) Off-Axis distance, OAD (mm) Off-Axis angle (dgrees)
0.5 2.5inch/63.5mm 15 60 6.9
0.75 3inch/76.2mm 15 80 6.1
1 2.5inch/63.5mm 5 60 3.4
1 4inch/101.6mm 17 110 6.3
1.25 3inch/76.2mm 15 80 3.7
1.25 5inch/127mm 20 100 4.6
1.5 6inch/152.4mm 25 100 3.8
2 4inch/101.6mm 17 110 3.2
2 5inch/127mm 20 100 2.9
2 8inch/203.2mm 33 150 4.3
2.5 10inch/254mm 45 175 4
3 6inch/152.4mm 25 100 1.9
4 8inch/203.2mm 33 150 2.2
5 10inch/254mm 42 175 2

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

Off-Axis Parabolic (OAP) Mirror Design Specifications

Case Study – Large OAP Mirrors

Choosing Between Parabolic and Spherical Mirrors