Description
390nm excitation filter for biomedical fluorescence testing custom optical filter
Specifications
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Center Wavelength (CWL): 390 nm ± 2 nm (385 / 395 / 400 nm on request)
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Half Bandwidth (FWHM): 10 nm / 15 nm / 20 nm / 30 nm (custom 5–50 nm)
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Peak Transmittance (Tpeak): ≥ 35%–55% (all-dielectric on FS; >60% possible with optimized design)
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Blocking Range: 200–1100 nm (or 300–700 nm + 750–1100 nm split blocking)
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Blocking Level (Cut-off Depth): ≥ OD4 (0.01%) standard; OD5–OD6 optional
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Substrate Material: UV Fused Silica (JGS1 — essential for <400 nm transmission) / UV-grade N-BK7 (on request)
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Substrate Form: Plano-Plano Filter Window / Plano-Convex Lens with filter on flat side / Aspheric Lens + Filter Coating / Dichroic Set component
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Substrate Diameter: 10 mm – 150 mm (common Ø12.7 / Ø25.4 / Ø50 mm)
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Substrate Thickness: 1.0 / 2.0 / 3.0 mm (windows); per lens design if integrated
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Surface Quality: 60-40 / 40-20 Scratch-Dig
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Surface Flatness (Window): λ/4 @ 632.8 nm
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Parallelism: ≤ 1 arcmin (standard); ≤ 10 arcsec (precision)
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Incidence Angle: 0° ± 5° (AOI-tuned design on request; dichroic version @ 45°)
