BH-A08 Dielectric Mirror

Wide-passband filter transmitting a broad orange-red window (391 – 721 nm) with steep edges and deep blocking on both sides for clean spectral isolation.

Passband: 391 – 721 nm
Bandwidth (FWHM): ~507 nm
Centre wavelength: ~624 nm (nominal)
Passband transmittance: ≥ 89.4 % T (± 9.3 % ripple)
Short-wave edge (T₅₀): ≈ 371 nm, ~91 nm steepness
Long-wave edge (T₅₀): ≈ 878 nm, ~379 nm steepness
Short-wave blocking: OD ≥ 0.5 below 341 nm
Long-wave blocking: OD ≥ 0.4 above 908 nm
AOI: 0° (normal incidence); custom angles available
Construction: Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick
Custom options: Edge shifting, passband widening/narrowing, asymmetric blocking, rapid prototypes

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BH-A08 Bandpass Extended delivers Passband 391 – 721 nm, Bandwidth (FWHM) ~507 nm, and Centre wavelength ~624 nm (nominal).

The hard-oxide coating is built for repeated handling, heat, and cleaning.

Best suited for:

Red-channel colour separation and Cy3/RFP fluorescence collection in microscopy and flow cytometry — the wide passband maximises signal collection while blocking adjacent green and NIR channels

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Description

The BH-A08 Dichroic Mirror is a general-purpose visible pass-band filter combining high transmission across the entire visible spectrum with efficient near-infrared suppression. With peak transmission of 98.7 % at 495 nm and sustained >80 % transmission from 384-727 nm, the BH-A08 delivers exceptional photon efficiency across blue, green, and red wavelengths (Blue: 98 %, Green: 98 %, Red: 98 %). Simultaneous NIR reduction (49 %) and SWIR suppression (21 %) minimize thermal and infrared background noise in visible-light imaging and spectroscopic systems. The BH-A08 serves as a versatile dichroic element for multi-wavelength systems requiring visible light passthrough with thermal background rejection.

Key Advantages

Ultra-High Visible Transmission - 98.7 % peak at 495 nm with Blue: 98 %, Green: 98 %, Red: 98 % ensures maximum photon delivery across the visible spectrum with negligible color-dependent loss.
Efficient NIR Suppression - 49 % NIR transmission provides significant thermal background rejection while maintaining broadband visible pass-band, improving signal contrast in sensitive detectors.
Broadband Visible Coverage - 343 nm transmission bandwidth (384-727 nm) captures the entire visible spectrum in single optical element without color fringing or spectral distortion.
Hard-Oxide Ion-Assisted Coating - Multilayer hard-oxide construction delivers superior durability against thermal shock, mechanical stress, and environmental contamination.
Custom Format Flexibility - Round, square, and free-form geometries from 5-450 mm with Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG substrate options.

Typical Applications

Color Machine Vision - Passes full RGB spectrum to CCD/CMOS sensors while rejecting thermal background, enabling high-contrast color imaging in industrial inspection systems.
Fluorescence Microscopy - Transmits visible fluorescence emissions while suppressing infrared autofluorescence and thermal noise, improving signal-to-noise ratio in weakly fluorescent samples.
Dichroic Mirror Beam Combining - Functions as primary dichroic element to combine visible illumination with infrared diagnostics, separating optical pathways for simultaneous analysis.
Visible Light Communications - Isolates visible signal wavelengths from infrared thermal noise in free-space optical communication receivers and satellite imaging systems.
Multi-Spectral Analysis - Enables visible-spectrum measurement in instruments combining RGB imaging with thermal IR sensors, providing complementary data from single measurement.

Integrate the BH-A08 Dichroic Mirror into your visible-light imaging system with rapid prototyping and production capability to achieve high-fidelity color imaging.

FAQ

BH-A08 FAQ

What is BH-A08 and what is it used for?

BH-A08 is a Dichroic Mirror. The BH-A08 Dichroic Mirror is a general-purpose visible pass-band filter combining high transmission across the entire visible spectrum with efficient near-infrared suppression. With peak transmission of 98.7 % at 495 nm and sustained >80 % transmission from 384-727 nm, the BH-A08 delivers exceptional photon efficiency across blue, green, and red wavelengths (Blue: 98 %, Green: 98 %, Red: 98 %). Common uses include Color Machine Vision, Fluorescence Microscopy, Dichroic Mirror Beam Combining, and Visible Light Communications.

What are the key optical specs of BH-A08?

Key published specs for BH-A08 include Passband: 391 – 721 nm; Bandwidth (FWHM): ~507 nm; Centre wavelength: ~624 nm (nominal); Passband transmittance: ≥ 89.4 % T (± 9.3 % ripple); Short-wave edge (T50): ≈ 371 nm, ~91 nm steepness.

What applications is BH-A08 best suited for?

BH-A08 is commonly used for Color Machine Vision, Fluorescence Microscopy, Dichroic Mirror Beam Combining, and Visible Light Communications. Color Machine Vision - Passes full RGB spectrum to CCD/CMOS sensors while rejecting thermal background, enabling high-contrast color imaging in industrial inspection systems.

Can BH-A08 be customized for size, substrate, or coating requirements?

KUPO lists the construction for BH-A08 as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. Published custom options include Edge shifting, passband widening/narrowing, asymmetric blocking, rapid prototypes. Efficient NIR Suppression - 49 % NIR transmission provides significant thermal background rejection while maintaining broadband visible pass-band, improving signal contrast in sensitive detectors.

What should I know about angle of incidence and durability for BH-A08?

The published angle of incidence for BH-A08 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.