We have two new fully funded PhD positions available!
- One is concerned with our ring-shaped wave guides and matterwave interferometry.
- The other one will be on a novel optical intra-cavity microscopy technique, which will allow us to measure very small absorptions or changes in refractive index with high optical resolution.
For more information please contact Wolf von Klitzing
The paper is in the top 10 most downloaded papers of Applied Optics for November and December 2018.
Applied Optics 57 9863 (2018)
M. Mylonakis, S. Pandey, K. G. Mavrakis, G. Drougakis, G. Vasilakis, D. G. Papazoglou, and W. von Klitzing
Abstract: We present a simple high-precision method to quickly and accurately measure the diameters of Gaussian beams, Airy spots, and central peaks of Bessel beams ranging from sub-millimeter to many centimeters without special- ized equipment. By simply moving a wire through the beam and recording the relative losses using an optical power meter, one can easily measure the beam diameters with a precision of 1%. The accuracy of this method has been experimentally verified for Gaussian beams down to the limit of a commercial slit-based beam profiler (3%).
Setup of the beam diameter measurement
Real beam size as a function of the minimum transmitivity.
Congratulations to Jules Grucker, he just passed his Thèse d’État, which is the highest degree available in France.
AIP Advances 8 095020 (2018)
S. Pandey, H. Mas, G. Drougakis, K. G. Mavrakis, M. Mylonakis, G. Vasilakis, V. Bolpasi, and W. von Klitzing
We present a slave laser highly suitable for the preparation and detection of 87Rb Bose-Einstein condensates (BEC). A highly anti-reflection coated laser diode serves as an optical amplifier, which requires neither active temperature stabilization nor dedicated equipment monitoring the spectral purity of the amplified light. The laser power can be controlled with a precision of 10μW in 70mW with relative fluctuations down to 2 × 10^−4. Due to its simplicity and reliability, this slave laser will be a useful tool for laboratory, mobile, or even space-based cold-atom experiments. By the way of demonstration this slave laser was used as the sole 780nm light-source in the production of 3×10^4 BECs in a hybrid magnetic/dipole trap.
Figure 1: Stability of the power of a AR-coated diode lase slave.
We will organise the next Frontiers of Matterwave Optics conference and summer school!
The school will be held in Archanes close to Heraklion and the conference close to Chania. We have already assembled a very nice list of speakers… more news soon to come.
CONFERENCE: Crete 17.Sept. – 21.Sept. 2018
SUMMER SCHOOL 10.Sept. – 14.Sept. 2018
More info to come soon at http://www.matterwaveoptics.eu
Our ESA Space-Optics project has reached a major milestone: We have finished the development of a novel beam collimation technique, which works allows us to adjust the waist of the laser beam emitted from a fibre coupler to an arbitrary position simply by maximising the peak intensity of the laser beam at some other position.
This is a fiber collimator manufactured from the ultra-low expansion material ZERODUR.
In order to make the coupler space-compatible it is manufactured from ultra-low-expansion ceramics (ZERODUR) and has no moving parts.