BP1125nm Narrow Bandpass Filter | 10nm FWHM, OD3 Blocking, 1125nm CWL

The OPTOStokes BP1125nm is a precision narrow bandpass filter engineered for exacting near-infrared spectral isolation requirements. Fabricated with advanced hard dielectric thin-film coating technology, this filter delivers exceptional wavelength accuracy with a center wavelength of 1125nm ±2nm and a tight 10nm ±2nm FWHM, ensuring consistent >85% transmission across the 1124–1126nm passband. As part of our extensive in-stock bandpass filters portfolio, it provides deep optical density 3 blocking across the full 900–1900nm out-of-band range, delivering reliable signal purification for demanding optical detection systems.

Technical Specifications

Typical Applications

This 1125nm narrow bandpass filter is optimized for applications requiring precise wavelength selection and strong out-of-band light rejection. It is widely deployed in gas detection systems, environmental monitoring equipment, laser line purification, and analytical instruments. Its high blocking performance effectively suppresses unwanted background radiation and stray light, making it an ideal choice for low-light-level NIR detection and spectroscopy setups where signal integrity and measurement accuracy are critical.

Customization & Service Support

OPTOStokes provides comprehensive customization options for the BP1125nm filter to match unique system integration needs. Available modifications include custom substrate dimensions, circular, square or irregular shapes, and mounting ring assembly for direct installation. Our manufacturing capabilities deliver high OD blocking performance with consistent coating uniformity, backed by world-class quality control standards. We maintain a large in-stock inventory of standard configurations for fast delivery, while supporting custom coating designs with reliable lead times for both prototype validation and volume production orders.

Expert Optical Solutions for Your Project

Engineering and procurement teams often face challenges sourcing precision bandpass filters, including inconsistent wavelength accuracy, insufficient blocking performance, unreliable lead times, and limited technical support for custom requirements. At OPTOStokes, we combine deep optical coating expertise, rigorous quality assurance, and flexible supply options to eliminate these risks. For technical consultation, custom pricing, or sample requests, contact our optical specialists at sales@optofilters.com or submit an inquiry directly through our website.