A Longpass Filter, as a kind of optical bandpass filter, is designed to transmit light of longer wavelengths in selection than the cuton wavelength while obstructing or attenuating shorter wavelengths. Commonly utilized in photography, spectroscopy, microscopy, and sensor technologies, these filters are critical components in numerous optical applications.

At its core, the longpass filter operates by permitting light beyond a specific threshold wavelength to pass through, the wavelength is known as the "cuton wavelength," to pass through while effectively blocking shorter wavelengths. For instance, an IR longpass filter enables the transmission of infrared light while effectively filtering out visible and ultraviolet light. This selective filtration is achieved through the use of specialized coatings or materials with the ability to discriminate the designated wavelengths.

Longpass filters offer versatile control over the light spectrum, therefore improving image quality and facilitating various optical processes. Their adaptability and diverse functionalities make them indispensable components in an extensive series of optical systems and applications.

Shanghai North Optics provides both standard Longpass Filters and tailored solutions to meet individual needs. This page specifies our custom longpass filters. Our comprehensive range encompasses various dimensions and transmission wavelengths, ensuring compatibility with diverse requirements. The blocking wavelength ranges of our long pass filters extend from UV to IR, accommodating numerous spectral operations. Our longpass filters offer great steepness of the transition between transmission and blocking regions. Leveraging advanced production techniques and stringent quality control measures, we guarantee optimized durability and precise optical transmission in every filter we deliver. Plus, our dedicated technical support and design services ensure that your specific needs are met with utmost precision and efficiency.