G2812 Broad Bandpass Filter
Emerald-green filter (515 – 555 nm, > 90 % T) with sub-1 % UV/blue & red leakage and a very mild < 5 % IR tail beyond 760 nm.
- Green passband: 515 – 555 nm, > 90 % T
- UV/blue block: < 1 % T @ 390 – 490 nm
- Red/IR block: < 1.5 % T @ 607 – 765 nm
- IR tail: < 5 % T beyond 760 nm
- Construction: Ion-assisted hard-oxide; 5 – 450 mm, 0.21 – 3.8 mm thick
- Custom options: AOI tuning, ripple flattening, rapid prototypes
Learn more
G2812 delivers a razor-clean slice of green while driving nearly
every other wavelength into the noise. Transmission climbs above 90 % near 515 nm,
holds a flat plateau through ~555 nm, and drops below 1.5 % by ~607 nm.
UV/blue energy is kept near zero (aside from a small ≈5 % blip around 390 nm that
KUPO can flatten on request), and yellow-to-near-IR light remains suppressed out
to ~750 nm—only a gentle tail stays under 5 % at 780 nm.
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 excitation, green-LED machine vision,
RGB laser/LED projection, discrete green bands in multispectral cameras, saturated
stage lighting, and AR waveguides needing bright green injection without UV/IR heat.
Description
The G2812 represents an exceptional balance between passband breadth and blocking performance, delivering 54 nm of green-to-yellow transmission with 94.9 % peak efficiency. This clean-blocking design achieves outstanding rejection of both UV and long-wavelength light, establishing it as a reference standard for bandpass filtering.
Key Advantages
- Maximum Passband Transmission – 94.9 % peak efficiency with > 92 % average transmission across entire 513-559 nm bandwidth
- Outstanding Side-Band Rejection – Blocks 99.17 % of UV light and 98.71 % of red/NIR wavelengths—exceeding industry standards for out-of-band isolation
- Hard-Oxide Ion-Assisted Coating – Uncompromising durability against mechanical handling, chemical cleaning, and environmental stress
- Spectrally Balanced Design – Symmetric roll-off edges eliminate color fringing and maintain consistent transmission across the entire passband
- Universal Format Availability – Supplied as round, square, or free-form optical blanks (5-450 mm) on Borofloat, soda-lime, Schott D263 T, or Corning Eagle XG at your specified thickness (0.21-3.8 mm)
Typical Applications
- Live-Cell Imaging – Minimize phototoxicity while maximizing GFP signal collection in long-duration time-lapse microscopy experiments
- Diagnostic Immunoassays – Enable sensitive enzyme-linked immunosorbent assay (ELISA) detection with exceptional background rejection
- Portable Spectrophotometry – Deliver high signal-to-noise ratios in field-deployable colorimetric instruments for environmental and agricultural analysis
- Premium Laser Filtering – Achieve fiber-coupled 532 nm output with superior beam quality and minimal pump light contamination
- Display Technology Testing – Verify green channel performance in next-generation display systems with wavelength selectivity matching perceptual color standards
Choose G2812 as the reference bandpass filter for demanding applications; we provide rapid turnaround prototyping and full production scaling.
FAQ
G2812 FAQ
What is G2812 and what is it used for?
G2812 is a 543 nm Bandpass Filter. The G2812 represents an exceptional balance between passband breadth and blocking performance, delivering 54 nm of green-to-yellow transmission with 94.9 % peak efficiency. This clean-blocking design achieves outstanding rejection of both UV and long-wavelength light, establishing it as a reference standard for bandpass filtering. Common uses include Live-Cell Imaging, Diagnostic Immunoassays, Portable Spectrophotometry, and Premium Laser Filtering.
What are the key optical specs of G2812?
Key published specs for G2812 include Centre wavelength (CWL): 537 nm; Bandwidth (FWHM): 54 nm; Peak transmittance: ≥ 94.9 % T; Passband range: 510 – 564 nm; Edge steepness: ~14.5 nm (10 → 90 % per edge).
What applications is G2812 best suited for?
G2812 is commonly used for Live-Cell Imaging, Diagnostic Immunoassays, Portable Spectrophotometry, and Premium Laser Filtering. Live-Cell Imaging - Minimize phototoxicity while maximizing GFP signal collection in long-duration time-lapse microscopy experiments.
Can G2812 be customized for size, substrate, or coating requirements?
KUPO lists the construction for G2812 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. Universal Format Availability - Supplied as round, square, or free-form optical blanks (5-450 mm) on Borofloat, soda-lime, Schott D263 T, or Corning Eagle XG at your specified thickness (0.21-3.8 mm).
What should I know about angle of incidence and durability for G2812?
The published angle of incidence for G2812 is 0° (normal incidence); custom angles available. The hard-oxide coating is built for repeated handling, heat, and cleaning.
