Characterization of sensitivity of optical fiber cables to acoustic vibrations.

Fiber optic infrastructure is essential in the transmission of data of all kinds, both for the long haul and shorter distances in cities. Optical fibers are also preferred for data infrastructures inside buildings, especially in highly secured organizations and government facilities. This paper focuses on a reference measurement and analysis of optical fiber cables sensitivity to acoustic waves.

Coherent fibre link for synchronization of delocalized atomic clocks.

Challenging experiments for tests in fundamental physics require highly coherent optical frequency references with suppressed phase noise from hundreds of kHz down to μHz of Fourier frequencies. It can be achieved by remote synchronization of many frequency references interconnected by stabilized optical fibre links. Here we describe the path to realize a delocalized optical frequency reference for spectroscopy of the isomeric state of the nucleus of Thorium-229 atom.

Comparison of selected risk factors in cardiovascular diseases in two different populations of the Czech Republic.

Objectives: The aim of this work is to compare the current prevalence of selected risk factors in cardiovascular diseases in the Czech general population in a particular region with a selected population of Czech soldiers in a particular military unit.

Methods: Within medical preventive examinations, data from 684 civilians aged between 30-60 years were obtained (405 men and 279 women). Within compulsory medical preventive examinations, data from 659 soldiers from a particular military unit aged between 30-60 years were obtained (576 men and 83 women).

Prevalence of risk factors in cardiovascular diseases in selected population of the Czech Republic.

Objectives: The aim of the study is to describe current prevalence of selected risk factors in the Czech general population in a particular region and to compare the data with recently published results in the selected population of Czech soldiers. The work also deals with the advantages and disadvantages of methods determining overweight and obesity.

Methods: Within medical preventive examinations the data of 1,051 individuals (482 men, 569 women) were obtained.

Comb mode filtering silver mirror cavity for spectroscopic distance measurement.

In this work we present a design of an external optical cavity based on Fabry-Perot etalons applied to a 100 MHz Er-doped fiber optical frequency comb working at 1560 nm to increase its repetition frequency. A Fabry-Perot cavity is constructed based on a transportable cage system with two silver mirrors in plano-concave geometry including the mode-matching lenses, fiber coupled collimation package and detection unit. The system enables full 3D angle mirror tilting and x-y off axis movement as well as distance between the mirrors.