Dichroic Filter Glass Custom Objectives Lens Yellow Filter Glass
4 month ago
- Center Wavelength (CWL): Fixed at 530nm, aligning with the green region of the visible light spectrum. This precise CWL makes it ideal for applications targeting green fluorescence or green light-based detection.
- Full Width at Half Maximum (FWHM): Typically ranges from 5nm to 20nm, with custom options available for narrower bandwidths (down to 3nm).
- Transmittance: Achieves high transmittance (>92%) within the 530nm band, ensuring minimal loss of target light. This is vital for maintaining signal strength in low-light applications
- Blocking Efficiency: Delivers deep blocking (transmittance <0.1%, and as low as 0.001% for high-performance variants) across non-target wavelengths, including ultraviolet (UV), near-infrared (NIR), and other visible bands. This prevents stray light from interfering with measurements or observations.
- Optical Uniformity: Exhibits <2% variation in transmittance across the filter surface, ensuring consistent performance and avoiding distortion of light signals.
- Substrate Material: Common substrates include borosilicate glass and quartz . The substrate is selected based on the application’s environmental and spectral requirements.
- Working Principle
- Multi-Layer Coating Design: The filter is coated with 20–50 alternating layers of high-refractive-index (e.g., titanium dioxide, TiO₂) and low-refractive-indexmaterials. Each layer’s thickness is precisely calibrated to λ/4 (where λ = 530nm), ensuring optimal interference effects.
- Constructive Interference for Target Light: When light at 530nm strikes the filter, it passes through and reflects off the surfaces of the dielectric layers. The reflected waves from adjacent layers align in phase, resulting in constructive interference—this amplifies the transmission of 530nm light through the filter.
- Destructive Interference for Unwanted Light: For wavelengths outside the 530nm band, the reflected waves from the dielectric layers are out of phase. This leads to destructive interference, where the waves cancel each other out, effectively blocking transmission. The more layers the coating has, the deeper the blocking efficiency for non-target wavelengths.
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