INBP2125 SWIR Narrow Bandpass Filter | CWL 2125nm, FWHM 120nm, OD2

The OPTOStokes INBP2125 is a high-precision infrared narrow bandpass filters engineered for near-infrared spectroscopy and organic chemical bond analysis. Fabricated with advanced thin-film coating on sapphire and germanium substrates, it delivers peak transmission greater than 80 percent at a center wavelength of 2125nm with ±20nm tolerance, and a full width at half maximum of 120±30nm. As a high-performance member of SWIR filters, this component provides reliable optical density greater than 2 across the entire 400–3000nm out-of-band range, ensuring clean signal isolation for high-accuracy analytical instruments and spectroscopic measurement systems.

Technical Specifications

Applications

This SWIR narrow bandpass filter is specifically optimized for near-infrared spectrometers used to identify and quantify O-H, C-H and other characteristic chemical bonds in organic substances. Its stable spectral response and robust substrate make it ideal for:

• Near-infrared spectroscopy and organic functional group analysis

• Food and agricultural product composition and quality testing

• Pharmaceutical raw material identification and content measurement

• Petrochemical component detection and process monitoring

• Material structure characterization and infrared research instruments

• On-line industrial composition analysis and quality control systems

Customization & Service

OPTOStokes offers comprehensive custom SWIR filter solutions to meet your exact spectroscopic analysis requirements. We manufacture infrared bandpass filters in standard circular, square and custom irregular shapes, with optional precision mounting rings for seamless integration into your optical assemblies. Our extensive in-stock inventory ensures fast shipping for standard specifications, while our advanced coating and substrate processing capabilities deliver custom orders with reliable, predictable lead times. All products are manufactured to world-class quality standards and undergo rigorous 100 percent optical testing before shipment.

Pain Points & CTA

Spectroscopy and analytical instrument teams often face critical challenges: low SWIR transmission leading to weak signal intensity, insufficient broadband blocking causing elevated baseline noise, and long lead times for custom sapphire-germanium infrared components. These issues can reduce detection sensitivity, increase calibration workload, and delay instrument development schedules. At OPTOStokes, we solve these problems with our extensive ready-to-ship inventory, precision thin-film coating technology, and dedicated technical support team. Whether you need a single prototype for testing or high-volume production runs, we deliver precision optical components on time, every time.

For detailed datasheets, volume pricing, or to discuss your specific SWIR filter requirements, contact our expert team at sales@optofilters.com or submit an inquiry through our website today.