DOI Links for Encyclopedia Articles

A Digital Object Identifier (DOI) is a permanent, unique, and globally recognized identifier for a digital publication.

Each DOI consists of two parts:

• A prefix, which identifies the publisher.
• For RP Photonics, this is 10.61835.
• A suffix, which identifies the specific article within the publisher’s domain (and has no meaning as text).
• Example: the suffix “gps” belongs to our article on adaptive optics (and has nothing to do with the Global Positioning System), so the complete article DOI is 10.61835/gps.

To access an article, simply append its DOI to the resolver URL: https://doi.org/10.61835/gps

This link is guaranteed to remain valid even if the article is moved to a different location on the Internet. If a page URL changes in the future, RP Photonics will update the DOI records so that the DOI links continue to redirect to the correct location — ensuring persistent accessibility for citations and scholarly references.

In addition to the target URL, the DOI registry stores comprehensive metadata — including the article title, author, publication date, and publisher — which enables reliable indexing, cross-linking, and citation tracking across scholarly databases.

RP Photonics is a registered member of Crossref, the international DOI registration agency for scholarly publishers. Through Crossref, we deposit and maintain the official metadata of all encyclopedia articles, ensuring that our content is discoverable, verifiable, and permanently citable within the global research infrastructure.

When citing our encyclopedia articles or placing links to them on the Internet, you can still do so the old way, using our page URLs directly. However, we encourage you to use the DOI links instead — even though we are unlikely to move the articles elsewhere for the foreseeable future. DOI links provide several advantages:

• They guarantee long-term persistence and interoperability with scholarly databases.
• They are recognized and indexed by systems such as Google Scholar, Crossref, and library catalogues.
• They make citations traceable and countable within the global scholarly ecosystem.

Each encyclopedia article includes a citation box showing how to cite the work correctly, including its DOI.

Our own bibliographies and external references also use DOI links wherever possible, ensuring that readers and citation tools can always locate the original sources — even if publishers later change their web structures. Most scientific publishers provide DOI links for all their articles.