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Optics

Division 4

Division 4 which is responsible for optics is home to three base units: that of length, time and luminous intensity. On this basis, standards and measuring methods of highest accuracy are developed for various optical quantities.

 

Tasks

Division "Optics" supports industry, science and society by providing measurement services, research and development in the field of optical technology. Based on the SI units of length, time and luminous intensity different units are realized and disseminated. Further more, accurate standards and measurement techniques are developed.

The division realizes the time scale UTC (PTB), which is the legal time in the Federal Republic of Germany, performs precision measurements in different fields of optics and cooperates in international standardisation and certification.

4 division report from the annual report 2021 (german only)4 division report from the annual report 2021 (german only)

The Opens external link in new windowdivision report provides an overview of the most important news and events of the "Optics" division of the past year and thus complements the Opens internal link in current windowannual Report 2021 of the PTB. (german only)

News

Single photon emitters in hexagonal boron nitride have gathered a lot of attention due
to their favourable emission properties and the manifold of possible applications. Despite
extensive scientic effort, the exact atomic origin of these emitters has remained unkown
thus far. Recently, several studies have tied the emission in the yellow spectral region
to carbon-related defects, but the exact atomic structure of the defects remains elusive.
In this study, photoluminescence emission and excitation spectroscopy is performed on a
large number of emitters within this region. By comparison of the experimental data with
theoretical predictions, the origin of yellow single photon emission in hexagonal boron nitride is determined. Knowledge of this atomic structure and its optical properties is crucial for the reliable implementation of these emitters in quantum technologies.

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In Zusammenarbeit mit dem DLR Institut für Satellitengeodäsie und Inertialsensorik in Hannover wurde eine neuartige achromatische, planare Spiegelstruktur für die Laserkühlung von Atomen in einer magneto-optischen Falle entwickelt. Der Aufbau erzeugt alle zur Kühlung notwendigen Laserstrahlen aus einem einzigen Strahl. Da die Struktur nicht dispersiv ist, eignet sie sich auch zur Kühlung mit mehreren Wellenlängen, wie es bei Erdalkali-ähnlichen Atomen notwendig ist. Durch ihre Konstruktion vermeidet der Reflektor viele der Probleme, die bei der Mehrfarbenkühlung mit planaren Strukturen auf der Grundlage von Beugungsgittern auftreten, die bisher die vorherrschenden ebenen Strukturen für die Laserkühlung neutraler Atome waren. Die neue Reflektorstruktur ist ein vielseitiges, einfach herzustellendes Bauteil, das eine achromatische Strahlführung mit den Vorteilen einer planaren Architektur mit gutem optischen Zugang kombiniert.

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Offers for Students

As is the case at PTB in general, in Division Optics there is the possibility to write a student thesis, to complete an internship or to participate in research as a working student. If you are interested in the topics and projects of the working group, you can first contact the Opens external link in new windowcentral contact persons and mention the working group as a request.
 
Offers for Doctoral Candidates

As at PTB in general, Division Optics is active in many collaborations (with link to new Div. collaboration page) with universities, research institutions, industry and other metrology institutes worldwide. These collaborations support many exciting third-party funding opportunities for PhD students to become involved in PTB research. If you are interested in the topics and projects of the working groups, you can first inquire at the Opens external link in new windowjob postings.