Encyclopedia … combined with a great Buyer's Guide!

Standard Spectral Lines

Definition: spectral lines which are often used as wavelength references

More general term: spectral lines

German: Standard-Spektrallinien

Category: general opticsgeneral optics


Cite the article using its DOI: https://doi.org/10.61835/i46

Get citation code: Endnote (RIS) BibTex plain textHTML

Certain spectral lines – usually from common low-pressure gas discharge lamps used as spectral lamps – are frequently used as wavelength references. There are also laser lines which can fulfill similar purposes.

The refractive indices of optical materials (mostly optical glasses) are often specified at a number of standard wavelengths, in particularly at the lines C, C', D, d, e, F and F' (see Table 1).

365.0146 nmultravioletimercury
404.6561 nmviolethmercury
435.8328 nmbluegmercury
479.9914 nmblueF'cadmium
486.1327 nmblueFhydrogen
543.5 nmgreengreen HeNehelium–neon laser
546.074 nmgreenemercury
587.5618 nmyellowdhelium
589.2938 nmorangeDsodium
632.8 nmredred HeNehelium–neon laser
643.8469 nmredC'cadmium
656.2725 nmredChydrogen
706.5188 nmredrhelium
852.11 nminfraredscesium
1013.98 nminfraredtmercury

Table 1: Table of spectral lines which are frequently used in optics.

See the article on laser lines for many more lines generated with lasers.

More to Learn

Encyclopedia articles:

Questions and Comments from Users

Here you can submit questions and comments. As far as they get accepted by the author, they will appear above this paragraph together with the author’s answer. The author will decide on acceptance based on certain criteria. Essentially, the issue must be of sufficiently broad interest.

Please do not enter personal data here; we would otherwise delete it soon. (See also our privacy declaration.) If you wish to receive personal feedback or consultancy from the author, please contact him, e.g. via e-mail.

Spam check:

By submitting the information, you give your consent to the potential publication of your inputs on our website according to our rules. (If you later retract your consent, we will delete those inputs.) As your inputs are first reviewed by the author, they may be published with some delay.