Terminology

What is a 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....

What is 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....

What is 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...

What is 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...

What is Neutral Density Filter (ND Filter)?

A neutral density (ND) filter is a type of optical filter that reduces the intensity of all wavelengths of light equally, without affecting the color of the light. It's like...

What is a F-P (Fabry Perot) cavity?

In the context of optical filters, "F-P Cavity" stands for Fabry-Perot Cavity, which is a key component of Fabry-Perot filters. Here's a deeper dive into its meaning and impact on...