Extra-thick retaining rings offer several features that aid in mounting high-curvature optics such as aspheric lenses, short-focal-length plano-convex lenses, and condenser lenses. As shown in the animation to the right, the guide flange of the spanner wrench will collide with the surface of high-curvature lenses when using a standard retaining ring, potentially scratching the optic. This contact also creates a gap between the spanner wrench and retaining ring, preventing the ring from tightening correctly. Extra-thick retaining rings provide the necessary clearance for the spanner wrench to secure the lens without coming into contact with the optic surface.

PrismMirror

This convex mirror helps improve safety by eliminating blind spots. Use this mirror in a room, a hallway, a driveway, an entryway or an aisle to prevent accidents, theft, etc.

Flatmirror

Maintenance: This first surface mirror has an exposed reflective coating that is not protected by glass. To protect this coating, the manufacturer recommends cleaning the mirror with furniture polish. Do not use glass cleaning products. They could damage the reflective coating.

Thorlabs' retaining rings are used to secure unmounted optics within lens tubes or optic mounts. These rings are secured in position using a compatible spanner wrench. For flat or low-curvature optics, standard retaining rings manufactured from anodized aluminum are available from Ø5 mm to Ø4". For high-curvature optics, extra-thick retaining rings are available in Ø1/2", Ø1", and Ø2" sizes.

Dielectricmirror

45degree mirror

Plano-Convex lenses have a positive focal length and approach best form for infinite and finite conjugate applications. These lenses focus a collimated beam to the back focus and collimate light from a point source. They are designed with minimal spherical aberration and have a focal length which can be calculated using a simplified thick lens equation:

Thorlabs' MgF2 Plano-Convex lenses are popular for many applications in the UV and IR. These lenses are an ideal choice for applications from 200 nm to 6.0 μm. Magnesium Fluoride is extremely durable in comparison to other materials that reach this far down into the UV or out into the IR. The C-axis is oriented to minimize birefringence.

TrueMirror

Mirrors Optics

SIZING INFORMATION: The nominal sizes represent the diameter of the full dome from which the quarter dome mirror has been cut, not the length of the mirror’s circular arc. For instance, a nominal 20-inch quarter dome mirror is 10 inches high, 10 inches across and 10 inches deep, with a circular arc of about 15 inches.

where n is the index of refraction and R is the radius of curvature of the lens surface. To minimize the introduction of spherical aberration, a collimated light source should be incident on the curved surface of the lens when being focused and a point light source should be incident on the planar surface when being collimated.

Transmission Curve for Magnesium Fluoride: 10 mm Thick Uncoated Sample, Surface Reflections are Included in the Transmission Plot

This convex mirror is made of lightweight, flexible and durable acrylic, with a black vinyl frame. The mirror has an open top. This mirror features a flange for ceiling mounting. The flange has three pre-drilled mounting holes reinforced with metal brackets. (Screws and bolts not included).

Acrylic quarter dome (eighth of a sphere) convex mirror, for installation in a 90-degree corner. Indoor use only. This mirror is not designed for outdoor use.