Application Note

How Does An Interference Filter Work?

Source: Delta Optical Thin Film A/S
Delta Thin Film - interference filter

Interference filters are a powerful tool in optics for filtering light spectrally. These filters use thin coated layers of dielectric materials to manipulate light. In this application note, we examine the fundamentals of interference filters and explore the intricate workings of the interplay between dielectric layers. Uncover how light behaves at the interface of these layers, with fractions reflecting and transmitting through them, and learn about Snell's law of refraction, which guides our understanding as we navigate equations for reflection and transmission coefficients.

From single dielectric layers to the complex realm of multi partial reflections, read one to learn more about the inner workings of interference filters and their various applications.

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