B19506 490 nm shortpass filter

B19506 is a shortpass filter. The main high-transmission region is approximately 406-482 nm.

Measured wavelength range: 380-780 nm
Edge at 50% transmission: ≈ 485.6 nm
Peak transmission: ≈ 93.2% at 471 nm
Transmission ≥80%: 406-482 nm
Transmission ≤5%: 494-780 nm
Custom options: Wavelength response, dimensions and operating conditions

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

490 nm nominal-edge shortpass filter (B19506)

B19506 is a shortpass filter. The main high-transmission region is approximately 406-482 nm. Consider it when you need to pass the shorter wavelengths used by your light source or detector. Check the longer-wavelength response as well as the main cut-off.

Optical performance

Measured wavelength range: 380-780 nm. Performance outside this measured interval is not established by this curve.
Selected regions at or above 80% transmission: 406-482 nm. Approximate measured intervals.
Selected regions at or below 5% transmission: 494-780 nm. Measured sample intervals; confirm the required blocking for your order.
Peak transmission: Approximately 93.2% at 471 nm. Peak wavelength is not the same as a defined centre wavelength.
Measured edge at 50% transmission: Approximately 485.6 nm. Interpolated absolute-transmission crossing, checked against the factory summary.
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

Short-wavelength illuminated inspection: Consider illumination within 406-482 nm when longer-wavelength background interferes with the measurement. Check any secondary transmission against the detector response.
Illumination-band shaping: Evaluate retaining the shorter-wavelength part of a broadband source. Add a lower spectral limit if unwanted UV or shorter wavelengths must also be removed.
Fluorescence source conditioning: Consider trimming longer-wavelength output from an excitation source. Confirm signal transmission and rejection at the actual wavelengths rather than assuming a complete fluorescence filter set.

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.

Transmission spectrum

Questions about B19506

Which part of the spectrum is most useful when choosing B19506?

The measured regions at or above 80% transmission are 406-482 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 B19506?

The measured regions at or below 5% transmission are 494-780 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.