BH-A53 Visible-pass / infrared-attenuating filter

BH-A53 is a visible-pass / infrared-attenuating filter. The main high-transmission region is approximately 430-685 nm.

Measured wavelength range: 300-1500 nm
Peak transmission: ≈ 91.6% at 624 nm
Transmission ≥80%: 430-685 nm
Transmission ≤5%: 300-414 nm; 709-1105 nm; 1125-1385 nm; 1408-1488 nm
420-680 nm: 88.084% average transmission
Custom options: Wavelength response, dimensions and operating conditions

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

Visible-pass / infrared-attenuating filter (BH-A53)

BH-A53 is a visible-pass / infrared-attenuating filter. The main high-transmission region is approximately 430-685 nm. It can be considered when visible light is required and part of the longer-wavelength spectrum needs attenuation.

Optical performance

Measured wavelength range: 300-1500 nm. Performance outside this measured interval is not established by this curve.
Selected regions at or above 80% transmission: 430-685 nm. Approximate measured intervals.
Selected regions at or below 5% transmission: 300-414 nm; 709-1105 nm; 1125-1385 nm; 1408-1488 nm. Measured sample intervals; confirm the required blocking for your order.
Peak transmission: Approximately 91.6% at 624 nm. Peak wavelength is not the same as a defined centre wavelength.
Average measured transmission, 420-680 nm: 88.084%. Calculated from the factory sample data.
Average measured transmission, 730-1500 nm: 2.167%. 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

Visible-light camera systems: Evaluate attenuation of unwanted longer-wavelength light while retaining the visible signal. Check the entire detector sensitivity range, including any transmission recovery.
Illumination optics: Consider spectral conditioning between a source and the illuminated object. Confirm the source-weighted transmitted power and how reflected or absorbed power is managed.
Color-imaging development: Compare the visible response with the required camera color balance. Account for differences at the blue and red edges before choosing the optic.

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 BH-A53

Where does BH-A53 transmit at least 80% in the measured curve?

The measured regions at or above 80% transmission are 430-685 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.

Can BH-A53 be treated as a complete infrared blocker?

The supplied measurement extends over 300-1500 nm. Regions at or below 5% transmission are 300-414 nm; 709-1105 nm; 1125-1385 nm; 1408-1488 nm. Check the complete detector sensitivity range and specify the maximum leakage you can accept; behavior outside the measured interval is not established.

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