BH-S19 Multi-Range Filter

Green-yellow shortpass for extended visible transmission and red rejection in dual-band configurations.

Passband: 413 – 517 nm, 90.1 – 95.0 % T (± 2.5 % ripple)
Cut-off (T₅₀): ≈ 545 nm
Edge steepness: ~22 nm (90 → 10 % transition)
Blocking: < ~0.98 % T above 583 nm (OD ≥ 2)
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 tuning, ripple smoothing, 45° AOI, rapid prototypes

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BH-S19 Hybrid delivers Passband 413 – 517 nm, 90.1 – 95.0 % T (± 2.5 % ripple), Cut-off (T₅₀) ≈ 545 nm, and Edge steepness ~22 nm (90 → 10 % transition).

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

Best suited for:

Dual-band detection, colour imaging, extended visible imaging, optical filtering systems.

$88,888.00

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Description
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Description

The BH-S19, also designated B44, presents a shortpass profile with its 50 % cut-off measured at 545.2 nm. The passband peaks at 95 % near 501 nm, averaging above 92 % from 380 to 526 nm. Similar to its sibling BH-S18, the BH-S19 employs a B44-class coating design with a gentler transition slope, showing residual transmission of about 16 % in the yellow and 8-13 % in the red-to-NIR. This makes it a smooth-spectrum shortpass filter suited for applications that value spectral shape and wavefront quality over maximum edge steepness.

Key Advantages

545 nm cut-off with 95 % peak – Passes 380-526 nm at > 92 % average, covering UV-A through the full green window with minimal loss.
B44-class smooth roll-off – Gradual transition from green to yellow minimizes spectral oscillation and coating-induced wavefront distortion.
Broad spectral coverage – Nearly 150 nm of passband from UV through green, suited for broadband excitation or imaging applications.
Hard-oxide durability – Ion-assisted sputtered coating withstands thermal stress, solvent exposure, and repeated cleaning.
Custom formats – Round, square, or free-form blanks from 5 mm to 450 mm, thickness 0.21-3.8 mm, on Borofloat, soda-lime, Schott D263 T, or Corning Eagle XG glass.

Typical Applications

Cool-visible imaging – Passes the full blue-to-green spectrum with a smooth spectral profile, ideal for digital camera color channels.
Fluorescence filter sets – Serves as a smooth-edge excitation filter for GFP and similar green fluorophores where spectral purity matters more than edge steepness.
Projection color management – Splits cool and warm tones in projection light engines with minimal color fringing at the transition.
Scientific photometry – Approximates spectral weighting functions for radiometric and photometric instruments.
Lighting & display – Shapes broadband source output by smoothly removing warm-tone components above 545 nm.

KUPO Optics builds the BH-S19 to your exact dimensional and substrate specifications - from rapid prototypes to full production. Contact us.

FAQ

BH-S19 FAQ

What is BH-S19 and what is it used for?

BH-S19 is a 545 nm Shortpass Filter (B44 Grade). The BH-S19, also designated B44, presents a shortpass profile with its 50 % cut-off measured at 545.2 nm. The passband peaks at 95 % near 501 nm, averaging above 92 % from 380 to 526 nm. Common uses include Cool-visible imaging, Fluorescence filter sets, Projection color management, and Scientific photometry.

What are the key optical specs of BH-S19?

Key published specs for BH-S19 include Passband: 413 – 517 nm, 90.1 – 95.0 % T (± 2.5 % ripple); Cut-off (T50): ≈ 545 nm; Edge steepness: ~22 nm (90 → 10 % transition); Blocking: < ~0.98 % T above 583 nm (OD ≥ 2); AOI: 0° (normal incidence); custom angles available.

What applications is BH-S19 best suited for?

BH-S19 is commonly used for Cool-visible imaging, Fluorescence filter sets, Projection color management, and Scientific photometry. Cool-visible imaging - Passes the full blue-to-green spectrum with a smooth spectral profile, ideal for digital camera color channels.

Can BH-S19 be customized for size, substrate, or coating requirements?

KUPO lists the construction for BH-S19 as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. Published custom options include Edge tuning, ripple smoothing, 45° AOI, rapid prototypes. Custom formats - Round, square, or free-form blanks from 5 mm to 450 mm, thickness 0.21-3.8 mm, on Borofloat, soda-lime, Schott D263 T, or Corning Eagle XG glass.

What should I know about angle of incidence and durability for BH-S19?

The published angle of incidence for BH-S19 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.