• 90° Off-Axis Parabolic Mirrors
• Diamond Turned Designs
• Protected Silver Coatings Offer High Reflectance from 400 nm to 20 µm
• Excellent for Collimating a Point Source or Focusing a Collimated Beam
• Variety of Mounting Adapters Available

This Thorlabs' off-axis parabolic (OAP) mirror is diamond-turned, first-surface mirror that has been cut out of a parent parabolic mirror. By segmenting a full parabolic mirror, the resulting off-axis angled mirrors allow users to achromatically focus a collimated beam or collimate a point source. The angle at which the mirror focuses or collimates in relation to the incident beam is the off-axis angle. Thorlabs’ 90° off-axis parabolic mirrors, meaning that the incident beam is at a right angle to the reflected beam. The mirrors are fabricated from aluminum, and non-optical surfaces are black anodized. In addition, each item is engraved with the Item # for easy identification.

The bottom of this off-axis parabolic mirror features three mounting holes and an alignment hole, which are useful for mounting in OEM applications. For customers who wish to integrate this mirror with standard optomechanics, there are two types of adapters. The first type (Item # ending in P1 ) has a rounded outer diameter for mounting the mirror in standard Ø1"", Ø2"", and Ø3"" kinematic mounts. The second type (Item # ending in P2) has 8-32 (M4) tapped holes for post mounting the mirror 90° relative to a post.

• Substrate: Aluminum
• Off-Axis Angle: 90°
• Parent Focal Length Tolerance: ±1%
• Reflected Focal Length Tolerance: ±1%
• Clear Aperture: 90% of Diameter
• Surface Roughness: <100 Å RMS
• Surface Irregularity: ?/4 (@633 nm)
• Surface Quality: 40-20 Scratch-Dig
• Mounting Holes: 3x 4-40 Mounting Holes on Radial Pattern
• Manufacturing Process: Diamond Turned
• Coating: Silver
• Reflectivity (Average): >95% from 400 nm to 20 µm
• Mounting Threads: 8-32 (M4)
• Outer Dimension: Ø26.6 mm