640nm Optical Bandpass Filter (FWHM 20nm)

The 640nm optical bandpass filter is engineered to transmit light centered at 640nm with a Full Width at Half Maximum (FWHM) of 20nm. With precise wavelength selection and high transmission efficiency, this filter is ideal for applications in fluorescence imaging, color detection, and spectroscopy requiring sharp spectral isolation in the red region of the visible spectrum.

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Standard Specifications:

• Type: VIS Bandpass Filter, Interference Filter
• Coating Type: Hard-coated for durability and long-term performance
• Center Wavelength (CWL): 640nm ± 2nm
• Full Width at Half Maximum (FWHM): 20nm ± 2nm
• Blocking Range: 200nm – 1100nm
• Blocking Depth: OD4, OD5, or higher (customizable)
• Peak Transmission: > 90%
• Thickness: 0.2mm, 0.3mm, 0.5mm, 0.55mm, 0.7mm, 1.0mm, 1.1mm (custom options available)
• Sizes: Round or square (e.g., φ12.5mm, φ25.4mm, φ50mm)
• Clear Aperture: > 90%
• Material: B270, Fused Silica

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Custom Options:

• Bandwidth: Customizable FWHM (e.g., 10nm, 30nm, 40nm, etc.).
• Angle of Incidence (AOI): Adjustable based on application needs.
• Blocking Depth: OD levels tailored to application requirements.
• Size: Round or square dimensions up to 150mm x 150mm.
• Material Thickness: Custom thickness options available.
• Transmission and Blocking Range: Customizable within 200nm – 2000nm.

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Applications:

• Fluorescence Imaging: Ideal for isolating emission signals in the red spectrum.
• Color Detection: Ensures precise wavelength selection for color analysis.
• Spectroscopy: Narrowband filtering for enhanced spectral resolution.
• Biomedical Imaging: Improves contrast and accuracy in diagnostic devices.
• Optical Communication: Facilitates data transmission using 640nm wavelengths.
• 3D Imaging Systems: Enhances depth imaging by isolating specific red wavelengths.
• Laser Alignment: Supports precise laser beam control in the red region.