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	The femtosecond optical frequency comb based tool for spectral analysis of molecular absorbtion gases Lešundák, Adam ; Šmíd, Radek ; Buchta, Zdeněk ; Mikel, Břetislav ; Lazar, Josef ; Randula, A. ; Číp, Ondřej The spectral analysis of absorption of molecular gases belongs to very powerful methods for detection of concentration of gases in a tested sample. In case of the human breath it consists of hundreds of molecules of gasses and their concentrations are known as biomarkers. An increased concentration of more of them indicates certain diseases or symptoms. The presenting work covers a pilot experiment where femtosecond pulse probe laser and a detection chain based on cross-correlation makes an analysis of the specimen of the absorption gas. In the pilot experimental set-up the detection part utilizes a Michelson interferometer with movable measuring mirror. We developed a novel digital processing method for precise stabilization of the speed of the mirror during measuring process. The caught optical signals are calculated by the fast Fourier transform from the time to wavelength domain. The first caught spectra of the femtosecond beam passing trough the specimens show absorption lines of one isotope of acetylene which was tested as the first sample. The work proofed positive the possibility of using the femtosecond laser for detection of broadband absorption spectra in the infrared region. Detailed record
	Generation of exact lengths by the use of optical comb Šmíd, Radek We present a method genaration of precise length using optical frequency comb stabilized to atomic reference clock. Optical frequency comb are able to tranfer the exact time stability from atomic clock reference to optical path measurement. We used Fabry-Perot cavity with ultra-low expansion material placed into the vacuum chamber. The exact length of Fabry-Perot cavity in vacuum is used as a reference for measurement of refractive index of ambient air. Detailed record
	Laser interference nano-comparator for length sensor calibration in nanometric scale Číp, Ondřej ; Mikel, Břetislav ; Čížek, Martin ; Šmíd, Radek ; Buchta, Zdeněk ; Lazar, Josef In the work we present new laser measuring system for precise calibrations of length measuring transducers. This gauge is called nano-comparator because the resolution of the positioning of the measuring probe is in order of nanometers. The gauge works fully self-controlled and it is equipped by control software which is able to calibrate wide area of transducers. We put main stress to compensating of thermal dilatation of the gauge body and to eliminating of imperfection of linear guide ways which are used for positioning of the testing probe of the gauge. The work presents the first records of scale calibration of an incremental transducer. Detailed record

See also: similar author names
4	Šmíd, Radim
9	Šmíd, Roman

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