Front Surface Mirrors: Precision for Optical Applications

At Saida Glass, we specialize in manufacturing high-precision front surface Mirrors (FSMs) engineered to demanding optical systems. Unlike standard mirrors, which reflect light through the glass substrate, FSMs have the reflective coating applied on the front surface. This avoids secondary reflections and ghosting, making them ideal for applications like spectroscopy, imaging, and laser systems.

Manufacturing Process

Front surface mirror are processed with strict quality control. The process begins with CNC cutting and edge grinding of optical-grade glass or substrates. The surface is then polished to achieve exceptional flatness. Next, we deposit a highly reflective metal coating (such as aluminum, silver etc.) via advanced vacuum coating technology. Usually, a protective SiO₂ layer will be applied to enhance durability and environmental resistance.

Customizable Parameters

We offer a range of customization choices

Substrate material: Optical Glass, borosilicate... 

Size and shape: round, rectangular, or irregular complex geometries

Surface flatness: from λ/10 to λ/2

Reflective coating: type and thickness custom for specific wavelength ranges

Protective coating: optimized for humidity or abrasion resistance

Front Surface Mirror vs. Standard Mirror vs. Magic Mirror

A standard mirror has its reflective layer behind the glass, leading to double reflections and reduced accuracy.

A “magic mirror” (often used in decorations or retail) typically uses a second-surface design with partial transmission and distortion.

However, an front surface mirror offers superior optical performance with minimal distortion, high reflectivity, and no secondary reflection—critical for precision optical instruments.