Types and Core Parameters of 445/520nm Filters

Both 445nm and 520nm filters belong to narrowband filters, which selectively transmit light of specific wavelengths through special materials or coating processes. They are widely used in laser technology, optical measurement, biomedical applications, and other fields.

Typical Applications of 445nm Filters

• Laser Technology: Used as narrowband filters in lasers to adjust the output intensity and purity of 445nm wavelength laser light, suitable for industrial processing, scientific research experiments, and other scenarios.
• Optical Instruments: Serve as wavelength-selective components in spectral analysis or optical measurement to ensure the transmission of specific wavelength bands and improve detection accuracy.

Diverse Applications of 520nm Filters

• Machine Vision: Filters out background stray light through bandpass characteristics to enhance the clarity of 520nm green light imaging, used in industrial inspection, biometric recognition, and other fields.
• Biomedical Applications: Compatible with fluorescence analyzers and biochemical detection equipment, enabling precise identification of sample markers by transmitting specific green light bands.
• Depth Cameras: As a core component of optical systems, optimizes green light signal acquisition and enhances depth perception in 3D imaging.

Technical Features and Selection Recommendations for 445/520nm Filters

Common Technical Characteristics

• Transmissive Design: Both achieve wavelength selection based on material transmission characteristics, controlling the transmission wavelength by adjusting the refractive index and thickness, similar to the principle of gratings.
• Coating Process: The 520nm filter uses high-temperature evaporation combined with ion source-assisted coating technology to form a durable hard film, improving wear resistance and service life. Although the process for the 445nm filter is not explicitly stated, it is presumed to employ similar high-precision coating techniques to ensure performance.