BBP-485 485 nm bandpass filter

485 nm nominal-channel bandpass filter (BBP-485)

BBP-485 is a bandpass filter. The main high-transmission region is approximately 477-495 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.

Optical performance

• Measured wavelength range: 300-800 nm. Performance outside this measured interval is not established by this curve.
• Main band at half-peak transmission: Approximately 471.9-500 nm, giving a full width at half maximum (FWHM) of approximately 28.1 nm. This describes the main band only; other transmitted regions may remain.
• Selected regions at or above 80% transmission: 477-495 nm. Approximate measured intervals.
• Selected regions at or below 5% transmission: 300-464 nm; 506-727 nm. Measured sample intervals; confirm the required blocking for your order.
• Peak transmission: Approximately 90.6% at 487 nm. Peak wavelength is not the same as a defined centre wavelength.
• Average measured transmission, 300-460 nm: 0.176%. Calculated from the factory sample data.
• Average measured transmission, 480-490 nm: 90.148%. Calculated from the factory sample data.
• Average measured transmission, 500-700 nm: 0.875%. Calculated from the factory sample data.
• Customization: We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.

These values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.

Applications to consider

• 488 nm illuminated inspection: Consider a source around 488 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.
• Optical sensing channels: Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.
• Fluorescence instrument development: Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.

Choosing this filter

• Additional regions reach at least 50% transmission at approximately 737-741 nm. Include these in the detector and blocking assessment.
• Check the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.
• Tell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.

Custom options

Start with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.