Linear Variable Bandpass Filter or continuously variable filters are precision coated wedge-shaped bandpass optical filters with central wavelengths that change linearly (sometimes not 100% linear) across the length of the filter. This spatial variation in optical properties allows for a linear change in the transmission characteristics across the surface of the filter. A single linear variable bandpass filter can fulfill the function of multiple homogeneous filters or a grating based monochromator. It is feasible to adjust the center or edge wavelength by sliding the filter or rotating it. Linear variable bandpass filters find widespread use in spectroscopy, hyperspectral imaging, and fluorescence microscopy applications, where they play a crucial role in isolating specific spectral bands for analysis. 

North Optics offers Linear Variable Bandpass Filters with customizable specifications, including central wavelength, bandwidth, and filter size, catering to diverse application requirements. Adopting an advanced wedge-shaped multi-layer coating technique, these filters offer high spectral resolution and low optical loss over a broad tunable spectral range. A deep blocking depth ensures efficient cutoff of the undesirable light to maximize optical performance at the required wavelength. Compact, lightweight construction renders them suitable for integration into portable and space-constrained optical setups. Through manipulation of the slope of the thin-film layers, a specific linear variation in transmission wavelength can be achieved, enabling precise spectral control and tuning for various applications. With their wide operating range, high transmission efficiency, and robust construction, these linear variable filters provide reliable performance in demanding laboratory and industrial environments.