BBP-585 Bandpass Filter
BBP-585 isolates the amber/yellow channel with ~92–94 % transmission in the ~575–605 nm band and near-baseline leakage across the rest of the visible.
- Main passband (T): ~92–94 % T @ 575 – 605 nm
- Cut-on / cut-off: Steep edges around the ~570 nm and ~610 nm regions
- Out-of-band (VIS): ~0–2 % T across ~410 – 800 nm
- UV/blue feature: ~5–20 % T @ 380 – 410 nm (optional extra blocking)
- Ghost control: Optional rear AR and slight wedge available
- Substrates: Borofloat®, Eagle XG, D263 T (≤ 450 °C), soda-lime (≤ 150 °C)
- Size / thickness: 5 – 450 mm • 0.21 – 3.8 mm (custom cut & dicing)
Learn more
BBP-585 is a narrow visible bandpass centred near 585 nm, delivering
~92–94 % peak transmission across ~575–605 nm with steep edges for clean spectral
separation. Outside the main window, transmission stays near baseline (~0–2 %) across
most of the visible spectrum (~410–800 nm), reducing background and improving signal-to-noise
under mixed illumination.
Note: the spectrum may show a small secondary feature in the near-UV/blue around ~380–410 nm
(typically ~5–20 % transmission). If your source or detector is sensitive there, KUPO can add
an additional blocking stack to suppress that band.
Typical uses: 585 nm LED illumination for inspection, yellow emission isolation in
fluorescence/bio-imaging, reflectance/absorption photometry, spectral channel selection in optical
instruments, and stable 585 nm reference bands for calibration and detector testing. KUPO supplies
rear-surface AR, slight wedge, and rapid custom cutting—from small test chips to 450 mm plates—
on high-temperature glass (Borofloat®, Eagle XG, D263 T) or economical soda-lime.
Description
The BBP-585 is a precision narrow yellow filter centered at 585 nm with an extremely tight 25 nm FWHM passband (574-599 nm). Peak transmission reaches 93.0 %. This ultra-narrow filter isolates the sodium D-line region with exceptional purity, eliminating crosstalk from green and red wavelengths. Yellow transmission peaks at 65.8 % while all other visible regions plunge below 5 % - ideal for applications requiring monochromatic yellow light isolation.
Key Advantages
- Ultra-narrow yellow isolation – 25 nm FWHM provides monochromatic-grade precision for sodium D-line and yellow laser applications
- Exceptional color purity – 65.8 % yellow transmission with < 5 % leakage in green and red regions for clean signal
- Hard-oxide multilayer coating – Ion-assisted deposition ensures long-term stability under thermal cycling and environmental stress
- Custom blank availability – Round, square, and free-form options from 5 mm to 450 mm; thickness 0.21-3.8 mm
- Substrate flexibility – Borofloat, soda-lime, Schott D263 T, and Corning Eagle XG accommodate diverse designs
Typical Applications
- Sodium D-line spectroscopy – Precision isolation of 589 nm sodium doublet for optical and astronomical measurements
- Yellow laser filtering – Wavelength isolation for 585-590 nm laser-based systems and scientific instruments
- Biomedical diagnostics – Yellow fluorophore excitation in advanced medical imaging and tissue analysis
- Scientific research – High-resolution photometry and narrow-band optical measurements in laboratories
- Color-selective sensing – Monochromatic yellow detection in specialized machine vision and optical systems
Deploy BBP-585 for precision yellow-band applications with rapid custom manufacturing. We support both small-scale research and production deployment.
FAQ
BBP-585 FAQ
What is BBP-585 and what is it used for?
BBP-585 is a Narrow yellow bandpass for sodium D-line isolation. The BBP-585 is a precision narrow yellow filter centered at 585 nm with an extremely tight 25 nm FWHM passband (574-599 nm). Peak transmission reaches 93.0 %. Common uses include Sodium D-line spectroscopy, Yellow laser filtering, Biomedical diagnostics, and Scientific research.
What are the key optical specs of BBP-585?
Key published specs for BBP-585 include Centre wavelength (CWL): 586.4 nm; Bandwidth (FWHM): 26.3 nm; Peak transmittance: ≥ 93.0 % T; Passband range: 573 – 600 nm; Edge steepness: ~12 nm (10 → 90 % per edge).
What applications is BBP-585 best suited for?
BBP-585 is commonly used for Sodium D-line spectroscopy, Yellow laser filtering, Biomedical diagnostics, and Scientific research. Sodium D-line spectroscopy - Precision isolation of 589 nm sodium doublet for optical and astronomical measurements.
Can BBP-585 be customized for size, substrate, or coating requirements?
KUPO lists the construction for BBP-585 as Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick. Published custom options include CWL shifting, bandwidth tuning, custom blocking ranges, rapid prototypes. Custom blank availability - Round, square, and free-form options from 5 mm to 450 mm; thickness 0.21-3.8 mm.
What should I know about angle of incidence and durability for BBP-585?
The published angle of incidence for BBP-585 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
