short pass filter

Short-pass filters are useful in a variety of applications, including:

• In fluorescence microscopy, for separating excitation light from emission light, allowing only the excitation light (which is usually at shorter wavelengths than the emission light) to reach the sample.

• In astronomy, for observing specific wavelengths of light, such as ultraviolet radiation.

• In photography, for altering the color balance of a scene, for instance, by filtering out infrared and red light to enhance cool tones.

Short-pass filters can be made from colored glass, interference filters, or combinations of materials, depending on the desired cutoff characteristics and the application.