390nm excitation filter for biomedical fluorescence testing custom optical filter

390nm excitation filter for biomedical fluorescence testing custom optical filter

390nm optical filter

factory custom optical filters

custom optical filter

BFP optical filter

Precision narrow bandpass interference filter centered at 390 nm (near-UV / violet excitation band), designed to isolate the excitation wavelength for violet-excited fluorophores (e.g., DAPI, Hoechst 33342, AMCA, Cascade Violet) in biomedical fluorescence testing systems.

Hard-coated on UV-grade fused silica (JGS1) or UV-transmitting N-BK7 via ion-assisted deposition for high environmental stability and minimal wavefront error.

Available as stand-alone filter windows, or integrated onto plano-convex / aspheric lenses (filter-coated lens) and dichroic sets for fluorescence microscopes, microplate readers, flow cytometers, and IVD analyzers. Fully customizable in size, FWHM, blocking level, and mechanical mount per OEM drawing.

Description

390nm excitation filter for biomedical fluorescence testing custom optical filter

Specifications

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