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Monocrystalline silicon substrate: High rigidity and good thermal stability, suitable for applications requiring high power density or lightweight design; K9/fused silica substrate: Low cost and high surface accuracy, suitable for general infrared laboratory systems.

In the infrared band (2μm - 20μm), especially at 10.6μm (CO₂ laser), reflectivity typically reaches R > 98% - 99.5%. This means minimal energy loss in the infrared optical path. In the near-infrared band (800nm ​​- 1600nm), reflectivity is also typically above R > 96% - 98%, suitable for fiber lasers and optical communications.

Gold is resistant to oxidation, sulfidation, and corrosion. Pure gold films are relatively soft and easily scratched. A protective film (such as Y₂O₃, SiO₂, etc.) is usually added to the gold film to improve durability and cleanability.

In high-power CO₂ laser or fiber laser systems, it can withstand extremely high continuous power (kW level) without damage. It also possesses excellent heat dissipation capabilities.