BBP-850B 850 nm bandpass filter

BBP-850B is a bandpass filter. The main high-transmission region is approximately 817-875 nm.

Measured wavelength range: 300-1200 nm
Main-band width: ≈ 73.6 nm at half-peak transmission
Peak transmission: ≈ 97.3% at 841 nm
Transmission ≥80%: 817-875 nm
Transmission ≤5%: 300-797 nm; 903-1131 nm
Custom options: Wavelength response, dimensions and operating conditions

Values shown are sample measurements. Final specifications are agreed for your order.

850 nm nominal-channel bandpass filter (BBP-850B)

BBP-850B is a bandpass filter. The main high-transmission region is approximately 817-875 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.

Optical performance

Measured wavelength range: 300-1200 nm. Performance outside this measured interval is not established by this curve.
Main band at half-peak transmission: Approximately 810.8-884.4 nm, giving a full width at half maximum (FWHM) of approximately 73.6 nm. This describes the main band only; other transmitted regions may remain.
Selected regions at or above 80% transmission: 817-875 nm. Approximate measured intervals.
Selected regions at or below 5% transmission: 300-797 nm; 903-1131 nm. Measured sample intervals; confirm the required blocking for your order.
Peak transmission: Approximately 97.3% at 841 nm. Peak wavelength is not the same as a defined centre wavelength.
Average measured transmission, 400-760 nm: 0.435%. Calculated from the factory sample data.
Average measured transmission, 840-860 nm: 96.690%. Calculated from the factory sample data.
Average measured transmission, 900-1100 nm: 0.754%. 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

850 nm illuminated inspection: Consider a source around 850 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

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.

Catalog cross-reference: BP850-D02; earlier reference BBP-850B. Include either reference in your inquiry.

Transmission spectrum

Questions about BBP-850B

Which part of the spectrum is most useful when choosing BBP-850B?

The measured regions at or above 80% transmission are 817-875 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.

Which low-transmission regions are shown for BBP-850B?

The measured regions at or below 5% transmission are 300-797 nm; 903-1131 nm. That threshold is a way to summarize this sample, not a guaranteed blocking specification. For a weak signal beside a bright unwanted wavelength, tell us the actual wavelengths and maximum leakage you can accept.

Discuss this filter with KUPO - include the product reference, source wavelength, working angle and required dimensions.