Light Rod Mirrors

The specific parameters are as follows:

Basic Dimension Parameters

Diameter: The diameter of light rod mirrors has a wide range, such as from 1.5 mm to 300 mm or from 1 mm to 50 mm, which specifically depends on application requirements and manufacturing standards.

The production tolerances for the diameter are as follows: +0.00/-0.10 mm represents general - quality products; +0.00/-0.050 mm represents precision - quality products; +0.000/-0.010 mm represents high - quality products.

Length: The length of light rod mirrors varies in different application scenarios. For some special requirements, you can contact the manufacturer for customization.

Optical Performance Parameters

Focal Length: The focal length of a light rod mirror depends on factors such as the radius of curvature and the substrate material. The focal lengths of light rod mirrors with different designs and uses vary greatly and need to be determined according to specific products.

Reflectivity: Take Thorlabs’ hexagonal light homogenizing rods as an example. When coated with a broadband anti - reflection (BBAR) coating in the range of 350 - 700 nm or 650 - 1050 nm, an average reflectivity of <0.5% per surface can be provided, thus reducing surface losses.

Transmittance: The transmittance is related to the substrate material and the coating condition. Coating an anti - reflection film can improve the transmittance of the light rod mirror, and the specific values vary by product.

Surface Quality Parameters

Surface Finish: It refers to the smoothness of the light rod mirror surface, which affects light scattering and loss. High - quality light rod mirrors usually require a high surface finish, and the specific values depend on the precision requirements of the product.

Material and Coating Parameters

Substrate Material: Commonly used materials include ultraviolet fused silica (UVFS). For example, Thorlabs’ hexagonal light homogenizing rods use a UVFS substrate, which has characteristics such as low thermal expansion and low absorption.

Coating: Light rod mirrors can be uncoated or coated with specific film layers. For example, Thorlabs’ hexagonal light homogenizing rods can be coated with a BBAR coating, available in two specifications: 350 - 700 nm BBAR and 650 - 1050 nm BBAR.

Coating can improve the optical performance of the light rod mirror, such as increasing transmittance and reducing reflectivity.