BP645nm Bandpass Filter | 45nm FWHM, >90% Transmission, OD2+ Blocking

BP645nm Bandpass Filter | 45nm FWHM, >90% Transmission, OD2+ Blocking

The BP645/45nm is a high-performance visible bandpass filter designed for precision optical systems requiring reliable spectral isolation in the red visible spectrum. Centered at 645nm with a 45nm full width at half maximum bandwidth, it achieves greater than 90% average transmission across the 630nm to 660nm passband, while providing OD2+ out-of-band blocking over the broad 350nm to 1100nm spectral range. Manufactured with advanced thin-film coating technology on high-quality optical substrates, this filter offers excellent spectral uniformity, low environmental drift, and long-term durability for continuous industrial operation.

Technical Specifications

Applications

This 645nm bandpass filter is optimized for a wide range of industrial and analytical optical applications. It is widely deployed in machine vision systems for material sorting and high-speed QR code reading, where its consistent passband performance ensures accurate detection and reduced false readings. It also excels in thin-film and coating reflectance spectroscopy, industrial inspection equipment, and analytical instruments, delivering stable spectral performance across varying operating temperatures and environmental conditions.

Customization & Service

OPTOStokes provides both extensive in-stock standard configurations and full custom engineering support for the BP645nm bandpass filter. Standard form factors include circular, square, and custom irregular shapes, with optional precision mounting rings to streamline integration into your optical assembly. Our in-house coating and fabrication team supports high-level custom specifications to meet unique project requirements, while our large ready-to-ship inventory enables fast turnaround for standard orders. All products are manufactured to world-class precision standards with reliable lead times and guaranteed spectral performance.

Technical Support & Ordering

For engineering teams and procurement managers facing extended lead times, limited custom flexibility, or inconsistent filter performance across production batches, OPTOStokes offers a reliable, customer-centric alternative. Our technical team works directly with your R&D and procurement staff to address spectral design challenges, validate prototype requirements, and deliver consistent, high-quality optical filters on schedule. Contact our team at sales@optofilters.com to discuss your project requirements or request a formal quote.