BH-N20 Broadband Notch Filter
Yellow notch with steep edges and exceptional passband uniformity for precision optical systems.
- Notch centre: 543.2 nm
- Notch width (FWHM): 119.4 nm
- Notch depth: OD ≥ 3.3 (T < 0.055%)
- Passband transmittance: ≥ 89.7% T (outside notch region)
- Edge steepness: ~16.5 nm (90 → 10 % per edge)
- Passband recovery: Within 9 nm of notch edges
- AOI: 0° (normal incidence); custom angles available
- Construction: Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick
- Custom options: Centre tuning, notch width adjustment, multi-notch designs, rapid prototypes
Learn more
BH-N20 Hybrid delivers Notch centre 543.2 nm, Notch width (FWHM) 119.4 nm, and Notch depth OD ≥ 3.3 (T < 0.055%).
The hard-oxide coating is built for repeated handling, heat, and cleaning.
Best suited for:
High-precision optical instruments, advanced detection systems, scientific platforms, and applications combining spectral selectivity with light efficiency.
Description
The BH-N20 combines excellent transmission characteristics with precise notch specifications across extended wavelength ranges. With a 119 nm notch spanning 493-588 nm and 0.06 % depth at 533 nm, this filter achieves 91.7 % blue transmission and 94.7 % red-NIR transmission with 95.8 % peak efficiency. Its design emphasizes maximum signal preservation while providing selective green-yellow wavelength rejection, making it ideal for applications requiring the highest photon collection efficiency.
Key Advantages
- Highest Peak Transmission - 95.8 % efficiency across both passbands represents among the highest in the notch filter product line
- Exceptionally Low Notch Depth - 0.06 % transmission at 533 nm provides superior rejection of green light contamination
- Compact Notch Width - 119 nm blocking band balances green-yellow rejection with maximum usable passband coverage
- Hard-Oxide Ion-Assisted Coatings - Premium multilayer construction ensures maximum durability and environmental resilience
- Complete Format Customization - Round, square, and free-form geometries on standard glass substrates from 5-450 mm diameter with flexible thickness options
Typical Applications
- Photon-Limited Detection - Maximizes signal collection in ultra-sensitive fluorescence microscopy and single-photon counting
- Fluorescence Spectroscopy - Enables simultaneous blue and red channel measurement with maximum transmission efficiency
- Laser-Excited Imaging - Provides exceptional signal-to-noise in 532 nm laser-based fluorescence systems
- Sensitive Raman Detection - Blocks 532 nm Rayleigh scatter while maximizing Raman signal transmission for weak spectral features
- Advanced Optical Systems - Supports premium imaging architectures requiring maximum photon collection efficiency
Specialized prototyping available in 2-3 weeks for ultra-high transmission applications; production optimizes peak performance delivery.
FAQ
BH-N20 FAQ
What is BH-N20 and what is it used for?
BH-N20 is a 484/603 nm Notch Filter. The BH-N20 combines excellent transmission characteristics with precise notch specifications across extended wavelength ranges. With a 119 nm notch spanning 493-588 nm and 0.06 % depth at 533 nm, this filter achieves 91.7 % blue transmission and 94.7 % red-NIR transmission with 95.8 % peak efficiency. Common uses include Photon-Limited Detection, Fluorescence Spectroscopy, Laser-Excited Imaging, and Sensitive Raman Detection.
What are the key optical specs of BH-N20?
Key published specs for BH-N20 include Notch centre: 543.2 nm; Notch width (FWHM): 119.4 nm; Notch depth: OD ≥ 3.3 (T < 0.055%); Passband transmittance: ≥ 89.7% T (outside notch region); Edge steepness: ~16.5 nm (90 → 10 % per edge).
What applications is BH-N20 best suited for?
BH-N20 is commonly used for Photon-Limited Detection, Fluorescence Spectroscopy, Laser-Excited Imaging, and Sensitive Raman Detection. Photon-Limited Detection - Maximizes signal collection in ultra-sensitive fluorescence microscopy and single-photon counting.
Can BH-N20 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BH-N20 as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. Published custom options include Centre tuning, notch width adjustment, multi-notch designs, rapid prototypes. Complete Format Customization - Round, square, and free-form geometries on standard glass substrates from 5-450 mm diameter with flexible thickness options.
What should I know about angle of incidence and durability for BH-N20?
The published angle of incidence for BH-N20 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
