BP645-20 Bandpass Filter(CWL=645nm,FWHM=20nm)

BP645-20 Bandpass Filter - Precision Red Light Isolation

The BP645-20 bandpass filter delivers exceptional performance at the 645nm wavelength, positioned in the deep red region of the visible spectrum. With a narrow 20nm FWHM bandwidth and OD3 blocking, this filter provides superior spectral selectivity for demanding fluorescence microscopy, laser-based systems, and analytical applications.

Key Features

• Center Wavelength (CWL): 645nm - optimized for red light applications
• Narrow Bandwidth: 20nm FWHM for excellent spectral resolution
• High Optical Density: OD3 blocking ensures 1,000:1 rejection of unwanted wavelengths
• High Transmission: Optimized coatings maximize throughput at 645nm
• Premium Quality: Hard-coated surfaces for long-term durability and stability

Applications

Essential for a wide range of optical applications including:

• Fluorescence microscopy with red fluorophores (Cy5, Alexa Fluor 647, APC)
• Flow cytometry and multi-color cell analysis
• Confocal microscopy and laser scanning systems
• Red laser line filtering and beam cleanup
• Spectroscopy and photometric analysis
• Machine vision and color separation applications
• Semiconductor inspection and quality control
• Bioluminescence and chemiluminescence detection

Technical Excellence

The 645nm wavelength occupies a critical position in the red spectral region, making it invaluable for applications requiring precise red light isolation. Our BP645-20 filter's narrow 20nm bandwidth provides excellent spectral selectivity, enabling clear separation from adjacent orange (600-630nm) and far-red (660-700nm) wavelengths while maintaining high transmission efficiency.

With OD3 (1,000:1) blocking performance, this filter delivers effective out-of-band rejection critical for fluorescence applications and multi-color imaging experiments. The superior blocking ensures that fluorescence signals can be detected without interference from excitation light or emissions from other fluorophores in the blue, green, and yellow spectral regions.

Manufactured using advanced thin-film coating technology, the BP645-20 delivers consistent performance across the entire aperture with minimal transmission variation. The hard-coated surfaces ensure durability in demanding laboratory and industrial environments, maintaining optical quality through years of continuous use.

The 20nm bandwidth strikes an optimal balance between spectral selectivity and light throughput, making it ideal for both laser-based and LED-based systems. This bandwidth is particularly well-suited for fluorescence microscopy applications with red-emitting dyes like Cy5 and Alexa Fluor 647, which are widely used in biological imaging and molecular diagnostics.

The filter's narrow bandwidth also makes it excellent for wavelength separation in multi-laser systems and machine vision applications, where precise spectral discrimination is essential for accurate color measurements and reliable defect detection in quality control processes.

Whether you're conducting fluorescence imaging with far-red dyes, performing multi-color flow cytometry, developing red laser-based optical systems, or building spectroscopic instruments, the BP645-20 provides the wavelength precision and optical quality that professional applications demand. Trust SyronOptics for optical components that deliver research-grade performance.