Strontium optical lattice clocks for practical realization of the metre and secondary representation of the second

We present a system of two independent strontium optical lattice standards probed with a single shared ultra-narrow laser. The absolute frequency of the clocks can be verified by the use of Er:fiber optical frequency comb with the GPS-disciplined Rb frequency standard. We report hertz-level spectroscopy of the clock line and measurements of frequency stability of the two strontium optical lattice clocks.Comment: This is an author-created, un-copyedited version of an article accepted for publication in Meas. Sci. Technol. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi:10.1088/0957-0233/26/7/07520

Rachunek symboliczny - narzędzie do szybkiej analizy poliharmonicznego modelu silnika z wirnikiem klatkowym

This article focuses on the methods of: selecting the MMF space harmonics and deriving the so-called poliharmonic models of an induction machine by means of symbolical calculation. The rules for selecting the most important harmonics and the algorithm for fast deriving the poliharmonic models (using symbolical calculation) are presented.Artykuł przedstawia metody: wyboru harmonicznych przestrzennych SMM i tworzenia tak zwanych poliharmonicznych modeli maszyny indukcyjnej przy użyciu rachunku symbolicznego. Przedstawiono zasady wyboru najważniejszych harmonicznych oraz algorytm szybkiego otrzymywania modeli poliharmonicznych (przy użyciu rachunku symbolicznego)

Pressure broadening of hyperfine-structure components of the 5

Experimental results of a spectroscopic study of argon broadened profiles of the hyperfine-structure components of the intercombination 326.1 nm line 113Cd isotope are reported. We have found that the values of Lorentzian (collisional) widths of both hfs line components are different

Software for quality evaluation of a PS plate edge

Pre-sensitized (PS) plates are specially treated and coated aluminium sheets, widely used for offset printing. PS plates used in the Computer to Plate technology require strict quality control of the plate’s edges, disturbed during various finishing processes like cutting on guillotines or slitting. For this purpose a special tests stand had been built by the Silesian University of Technology, in cooperation with one of the largest PS plates manufacturer in the world - FUJIFILM. The paper describes the software, written for the purpose of evaluation of various defects caused during finishing processes

Asymmetry of hyperfine-structure components of the 5

Experimental results of a systematic study of profiles of the hyperfine-structure components of the intercombination 51S0 – 5 3P1 line of the even-odd 113Cd isotope perturbed by argon performed by means of a laser-induced fluorescence method are reported. We have found that the values of total line asymmetries of both hfs line components are different

Ultra-Narrow Laser for Optical Frequency Reference

We present ultra-narrow line width, tunable diode laser system which will be used as a local oscillator in an optical atomic clock and for precision spectroscopy of Sr near 689 nm. Design of the high finesse optical cavity used as short-term frequency reference is optimized with respect to insensitivity to vibrations. We achieved laser line width of about 8 Hz, measured by comparison of two identical systems. The relative phase lock of two lasers is better than 150 mHz. Laser tunability and usefulness for precison spectroscopy were demonstrated through line shape measurement of a 20 kHz wide resonance of the optical cavity

The hyperfine and isotope structure of the Cd intercombination line – revisited

Careful analysis of the intercombination 51S0–53P1 line of the 113Cd isotope with two hfs components $F'= \frac{1}{2} \rightarrow F'' = \frac{1}{2}$ and $F' = \frac{3}{2} \rightarrow F'' = \frac{1}{2}$ was carried out. The hyperfine splitting of this line was determined to uncertainty less than 10-3 cm-1 using neon-perturbed Doppler limited spectra