Cut-on Wavelength
Keywords: Longpass Filters, Longpass Dichroic Mirror
An optical longpass filter transmits light with wavelengths longer than a specific value, known as the cut-on wavelength, while blocking shorter wavelengths.
Key characteristics:
- The cut-on wavelength (λcut-on) is the wavelength at which the filter begins to transmit light (typically defined as the wavelength where transmission reaches 50% of its maximum value)
- Wavelengths shorter than λcut-on are largely blocked
- Wavelengths longer than λcut-on are transmitted
- The transition from blocked to transmitted is not instantaneous but occurs over a range of wavelengths
