MultiBandpass Filter 640/791

Dual-Band Precision for NIR Fluorescence & Spectroscopy

The MultiBandpass Filter 640/791 delivers simultaneous transmission at 640 nm and 791 nm, engineered for multi-channel fluorescence microscopy, dual-laser spectroscopy, and NIR imaging workflows. Ideal for research labs requiring precise spectral isolation across visible-to-NIR transitions.

Key Features

• Dual-band transmission: High-efficiency passbands at 640 nm and 791 nm with steep edge transitions
• Deep blocking: OD 4+ rejection across UV, visible, and NIR regions outside passbands
• Rugged hard-ion coating: Durable, scratch-resistant surface for repeated handling in lab environments
• Low autofluorescence: Minimal background signal for sensitive detection applications
• Standard 25 mm diameter: Drop-in compatibility with filter cubes, wheels, and optical mounts

Applications

• Multi-color fluorescence microscopy (Cy5 / NIR dye combinations)
• Dual-laser Raman spectroscopy
• NIR imaging and photoluminescence studies
• Flow cytometry and cell sorting
• Optical coherence tomography (OCT)

Specifications

Substrate: Fused silica or optical glass | Coating: Hard dielectric multilayer | Diameter: 25 mm (custom sizes available) | Thickness: 2–3 mm | Surface quality: 40-20 scratch-dig | Transmitted wavefront error: λ/4 @ 633 nm

Each filter ships with a spectral performance curve and is tested for transmission, blocking, and durability under lab conditions.