Die RP Photonics Encyclopedia

The pages of the RP Photonics website have been redesigned. A sidebar now holds the table of contents, the concept tree and the related topics, so that the article text begins much higher up the page. The masthead shows simulation figures which can be turned over to reveal what they show. This article describes what has changed for you as a reader, and some of the care that went into making the pages work on screens of every size.

Many laser systems remain expensive because they are produced in limited volumes with tight tolerances, delicate assembly and insufficient automation. This article explains the resulting volume–cost trap: cheap lasers require large markets, while many large markets can emerge only once lasers become cheaper. It discusses promising application areas, different cost-reduction paths for various laser technologies, and the broader challenges of standardization, reliability, system cost and manufacturing scale-up.

Photonics is experiencing a renewed surge of interest, driven largely by the rapid expansion of AI infrastructure and its growing demands on data transmission and energy efficiency. This article examines the technological, economic and geopolitical factors behind this trend, while also discussing emerging applications and associated systemic risks.

The RP Photonics tools for responsible purchasing with a structured purchasing process have been improved further.

While general-purpose AI tools are useful for language processing and general explanations, they are unreliable for the critical task of finding specialized photonics suppliers. This is because general-purpose AI lacks systematic coverage, uses outdated data, and does not follow well-established systematic procedures. Therefore, expert-curated directories remain the premier, reliable source for complete and accurate supplier discovery in specialized technical fields.

Formulas for peak intensities, fluence values and areas of Gaussian beam are often wrong by a factor of 2.

The RP Photonics Encyclopedia now displays concept trees for many articles, graphically indicating both more general and more specific terms covered.

Photon counting is an interesting concept, but the term is often inappropriately used. Better terminology would avoid some confusion in science and even more so in technology.

It is interesting to ask whether photons have an optical phase – but a more precise rephrasing is required to get sensible answers. We also discuss curious two-photon quantum interference.

The question whether monochromatic light can be unpolarized is addressed with an interesting gedanken experiment. Different definitions of monochromacity can be used, but which one makes most sense?

Although AI bots have improved a lot, tests prove that they still cannot provide reliable answers on photonics questions. While semantic search works well, a photonics chatbot is currently not feasible.

For avoiding trouble with purchases, a structured purchasing process is essential. RP Photonics offers well thought-through web tools for that.

RP Photonics has introduced several AI-based features on its website for the benefits of users and advertisers. The technical background is explained.

For effective teaching of physics, active engagement of students is essential. It is shown in an example case on light absorption in a rare-earth-doped fiber how this can be done.

Successful work in photonics requires a set of skills. Here, the required skills are discussed, also ways of actively improving them.

Purchasing sophisticated and expensive equipment like a laser system requires detailed considerations concerning the requirements, technical specifications and various qualities of potential suppliers. Applying good practices can be vital.

RP Photonics started to publish interesting case studies, mostly based on physical simulation models. These nicely complement the encyclopedia articles.

Being a member of Crossref, RP Photonics used the opportunity to implement the feature to search for publications citing a specific paper. This can be useful in various ways.

Online encyclopedia articles of high quality are suitable for citations, and in fact it may even be required to do that. The article discusses various criteria for such decisions and also provides interesting news on the RP Photonics Encyclopedia.

AI chatbots, which got rather popular, are often used for researching facts. But how reliable is that in the field of photonics? Some tests lead to disappointing results.