IPB COLLOQUIUM 10 December, 2015


which will be held on Thursday, 10 December 2015 at 13:00 in the "Dragan Popović" library reading room of the Institute of Physics Belgrade.

The first talk entitled


will be given by Jerzy Zachorowski (Photonics Department, Jagiellonian University, Krakow, Poland),

and the second talk entitled


will be given by Wojciech Gawlik (Photonics Department, Jagiellonian University, Krakow, Poland).

Joint abstract for both talks: The talks will present two fields of activity of the Photonic Departments of the Jagiellonian University in Krakow:

1) The construction of the strontium optical atomic clock.

2) The experiments on Nitrogen Vacancy color centers in diamond.

The time and frequency standards have the best accuracy of all the SI units. Nevertheless, research on new standards of much higher accuracy and stability are undertaken. They concentrate mostly on clocks using optical transitions instead of microwave ones. Nitrogen vacancy (NV) color centers in diamond play a role of artificial atom, enabling attractive applications. In our experiments spin polarization of NV centers is created by optical excitation and monitored by microwave resonance (ESR technique) in the temperature range from 10 to 300 K. The talk will present the construction details of the strontium optical atomic clock built in Poland, recent results on absolute measurement of the clock transition in bosonic Sr88 and the novel studies of the coherent dynamics and relaxation processes in NVs with the methods of microwave spectroscopy.