centre wavelength; center wavelength
Technical term used in optics, photonics, and computing contexts to refer to the central wavelength of a light source or spectral distribution.
The centre wavelength of this laser is 1550 nanometres.
The transmission characteristics of the filter are designed based on the centre wavelength.
Compound of 中心 (centre) and 波長 (wavelength). A straightforward technical term with no obscure historical derivation.