Cut-off Wavelength
An optical shortpass filter transmits light with wavelengths shorter than a specific value, known as the cutoff wavelength, while blocking longer wavelengths.
Key characteristics:
- The cutoff wavelength (λcutoff) is the wavelength at which the filter begins to block light (typically defined as the wavelength where transmission drops to 50% of its maximum value)
- Wavelengths shorter than λcutoff are largely transmitted
- Wavelengths longer than λcutoff are blocked
- The transition from transmitted to blocked is smooth and occurs over a range of wavelengths
