G32701 Broad Bandpass Filter
Narrow green passband (470 – 540 nm, 92 – 94 % T) with < 1 % UV/blue and red leakage—ideal for high-contrast imaging and display engines.
- Green passband: 470 – 540 nm, 92 – 94 % T
- UV/blue block: < 1 % T @ 380 – 450 nm
- Red block: < 1 % T @ 580 – 725 nm
- NIR peek: Controlled rise > 760 nm (optional reference)
- Construction: Ion-assisted hard-oxide; 5 – 450 mm shapes, 0.21 – 3.8 mm thick
- Custom options: AOI tuning, ripple smoothing, rapid prototypes
Learn more
G32701 isolates the eye-sensitive 470 – 540 nm band while crushing stray UV/blue,
yellow-red, and most near-IR. Below ~450 nm transmission is essentially zero, then the curve
rockets past 90 % by ~470 nm, rides a flat 92 – 94 % plateau through 540 nm, and collapses
under one percent by ~580 nm. Out-of-band blocking holds to the noise floor until a secondary
rise begins beyond 760 nm, enabling optional NIR reference channels.
KUPO coats Borofloat®, soda-lime, Schott D263 T, or Corning Eagle XG substrates cut to any outline—from
5 mm chips to 450 mm plates—with thicknesses of 0.21 – 3.8 mm, and can ship prototypes
in about two weeks.
Typical uses: FITC-style fluorescence, green-LED machine vision, RGB laser/LED display engines,
multispectral cameras (green + NIR index), and AR waveguides requiring bright green injection
without UV/IR heat.
Description
The G32701 delivers precision green transmission across the cyan-to-yellow spectrum, achieving > 93 % efficiency within its passband. This 86 nm wide filter balances spectral breadth with excellent blocking characteristics, establishing it as an ideal solution for applications demanding bright, clean green light without UV contamination.
Key Advantages
- Peak Transmission – 94.9 % at 528 nm with average passband transmission > 93 % across the 469-548 nm range
- Superior Short-Wave Blocking – Blocks 99.84 % of light below 469 nm, ensuring UV rejection without interfering with visible green wavelengths
- Durable Hard-Oxide Coating – Ion-assisted deposition creates superior scratch and moisture resistance for laboratory and field deployment
- Minimal Red Leakage – 4.29 % transmission above passband provides acceptable blocking for most imaging and sensing applications
- Custom Format Availability – Available in round, square, and free-form blanks (5-450 mm) on Borofloat, soda-lime, Schott D263 T, or Corning Eagle XG substrates (0.21-3.8 mm thickness)
Typical Applications
- Fluorescence Microscopy – Excite GFP and similar green fluorophores with minimal background noise and superior transmission efficiency
- Machine Vision Inspection – Enable high-contrast defect detection in automated quality control systems where green wavelengths provide optimal material contrast
- Environmental Sensing – Monitor chlorophyll-related optical properties in vegetation and water quality analysis with targeted spectral selectivity
- Laser Line Filtering – Extract 532 nm Nd:YAG laser output with > 93 % efficiency while suppressing pump harmonics and ASE
- Display Calibration – Verify green channel output in LCD and LED displays with precise spectral matching to human photopic sensitivity peak
Partner with us for rapid prototyping of optical systems and volume production capabilities that deliver G32701 filters in your required formats and timeframes.
FAQ
G32701 FAQ
What is G32701 and what is it used for?
G32701 is a 528 nm Bandpass Filter. The G32701 delivers precision green transmission across the cyan-to-yellow spectrum, achieving > 93 % efficiency within its passband. This 86 nm wide filter balances spectral breadth with excellent blocking characteristics, establishing it as an ideal solution for applications demanding bright, clean green light without UV contamination. Common uses include Fluorescence Microscopy, Machine Vision Inspection, Environmental Sensing, and Laser Line Filtering.
What are the key optical specs of G32701?
Key published specs for G32701 include Centre wavelength (CWL): 509 nm; Bandwidth (FWHM): 86 nm; Peak transmittance: ≥ 94.9 % T; Passband range: 466 – 552 nm; Edge steepness: ~14.5 nm (10 → 90 % per edge).
What applications is G32701 best suited for?
G32701 is commonly used for Fluorescence Microscopy, Machine Vision Inspection, Environmental Sensing, and Laser Line Filtering. Fluorescence Microscopy - Excite GFP and similar green fluorophores with minimal background noise and superior transmission efficiency.
Can G32701 be customized for size, substrate, or coating requirements?
KUPO lists the construction for G32701 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 Format Availability - Available in round, square, and free-form blanks (5-450 mm) on Borofloat, soda-lime, Schott D263 T, or Corning Eagle XG substrates (0.21-3.8 mm thickness).
What should I know about angle of incidence and durability for G32701?
The published angle of incidence for G32701 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
