Terminology

Dichroic Filter

A dichroic filter, sometimes called a dichromatic filter, is a versatile tool in the realm of optics. It acts like a sophisticated traffic controller, selectively reflecting and transmitting specific wavelengths...

Longpass Filter

In the world of optics, a longpass filter acts like a selective doorkeeper, allowing only wavelengths longer than a specific point, known as the cut-on wavelength, to pass through freely....

Shortpass Filter

In the realm of optics, a shortpass filter acts as a selective gatekeeper, allowing only wavelengths shorter than a specific point, known as the cut-off wavelength, to pass through freely....

Cut-on Wavelength (Longpass Filter)

Longpass filter: Cut-on wavelength: This represents the shortest wavelength that the filter transmits efficiently. Below this wavelength, the filter rapidly blocks light with increasing effectiveness. Defined as the wavelength where the transmission rises to 50% of its peak value....

Cut-off Wavelength (Shortpass Filter)

Shortpass filter: Cut-off wavelength: This represents the longest wavelength that the filter transmits efficiently. Beyond this wavelength, the filter rapidly blocks light with increasing effectiveness. Typically defined as the wavelength where the transmission drops to 50% of its peak...

Center Wavelength (CWL)

In the context of optical bandpass filters, CWL stands for Center Wavelength. It indicates the wavelength at the center of the filter's passband, representing the wavelength that experiences the highest...