Application Note

Filter Spectra At Non-Normal Angles Of Incidence

In optical applications, filters are often utilized at normal angles of incidence (AOI) to manipulate light properties. However, understanding how filter spectra behave at non-normal AOIs is crucial for various scientific and technological endeavors. As the angle deviates from normal incidence, two significant effects become apparent across different filter types: a shift in spectral features towards shorter wavelengths and the emergence of distinct spectra for s- and p-polarized light.

This article delves into the spectral responses of three prominent filter series—RazorEdge® Edge Filters, MaxLine® Laser-line Filters, and StopLine® Notch Filters—as AOI increases. Moreover, we introduce the MyLight™ and SearchLight tools for modeling spectral responses at specific AOIs, enabling precise analysis and application of filter characteristics. You will also learn about the unique features of VersaChrome® Tunable Filters, designed to maintain performance across a wide range of angles. Gain these insights into optimizing filter performance under non-normal AOIs for diverse optical systems and more by reading the full article..

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