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Narrowing the linewidth of laser diode via fiber interferometer
Šmíd, Radek ; Argence, B. ; Číp, Ondřej ; Santarelli, G.
In this work we present a method of stabilization of laser diodes by unbalanced Michelson fiber interferometer. The unstabilized laser source is represented by compact planar waveguide external cavity laser module ORION (Redfern Integrated Optics, Inc.) working at 1040.57 nm with < 3 kHz linewidth. Wavelength of the laser matches P(13) 13C2H2 absorption line with tunability range +/- 10 pm. We built Michelson interferometer with 1 km arm based on SMF-28 fiber spool to suppress the frequency noise by fast PI control loop up to 33 kHz by modulation voltage. We were able to decrease the noise level by -60 dBc/Hz up to 33 kHz modulation limit range.
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Fabry-Perot displacement interferometry in air
Šmíd, Radek ; Durand, M. ; Wang, Y. ; Lawall, J.
In earlier work, we have demonstrated the use of Fabry-Perot interferometry to measure displacements of up to 50 mm with a fractional accuracy of 4 x 10-10 in vacuum. The initial work was done at a wavelength of 633 nm, and the more recent work was done at 1560 nm. We now seek to extend the approach to displacement measurements in air. A well-known approach to compensate for the refractive index of air without relying on independent measurements of the temperature and pressure is to use two wavelengths. In this work, we supplement our implementation at 1560 nm with an additional laser at 1064 nm in order to control for the dispersion of air.
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Deflection Measurement by Position Detection of the Laser Beam
Šarbort, Martin ; Řeřucha, Šimon ; Jedlička, Petr ; Lazar, Josef
We present a high precision angular deflection measurement system based on a triangulation method which provides resolution below 1 microradian within a range of several degrees. It is based on a triangulation method and a numerical position detection of the laser beam spot on a CCD/CMOS sensor. The experimental results indicate that the assembled instrument achieves a measurement error of 0.12 microrad in the range ± 0.6 degrees over the period of one hour.
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Interferometric Displacement Measurement with Frequency Modulated Beam
Řeřucha, Šimon
In this paper, we describe a new detection method, based on the traditional homodyne detection. The focus of the new method consists in using a frequency-modulated laser source for extracting phase information with similar accuracy. Unlike the original techniques the new method does not require to use polarizing optics in the interferometer itself, and only one photodetector is sufficient for the evaluation.
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Raman tweezers for sorting of living cells
Pilát, Zdeněk ; Ježek, Jan ; Kaňka, Jan ; Šerý, Mojmír ; Jákl, Petr ; Zemánek, Pavel
We have developed an instrument for automatized analysis and sorting of living cells of unicellular algae and other micro-objects based on laser tweezers and Raman spectroscopy. The system comprises the Raman tweezers setup, special microfluidic chip, and a specialized software allowing image recognition, spectral analysis, and automated sorting functions. The resulting instrument allows non-destructive analysis of chemical properties of living cells and their automatic separation for further examination or cultivation.
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Power Laser Technology at ISI 2013
Mrňa, Libor
The article described the activities of the ISI laser center. It was advanced diagnostics of laser welding process using frequency analysis, the development of a new type of adaptive mirrors for high power laser applications, an apparatus construction for laser hybrid laser-TIG welding, the development of new types of solar absorbers. Contract research for companies was offered.
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Fiber gratings to nuclear power plant Temelin and theirs calibration by laser interferometer
Mikel, Břetislav
We present application of the optical fiber sensors to measurement the shape deformation of the containment of the nuclear power station Temelin. The presented method can be used to measure any concrete buildings. To prepare optical fiber sensors we developed method of measurement of fiber Bragg gratings (FBG) stretching by laser interferometer. We are oriented to research, development and to methodology of the production and application of FBGs. The elongation of FBGs can calculated from frequency drift of the Bragg resonance wavelength and from the change of the grating period during stretching.
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Opticaly trapped tunable droplet microlaser
Ježek, Jan ; Pilát, Zdeněk ; Brzobohatý, Oto ; Jonáš, Alexandr ; Aas, M. ; Kiraz, A. ; Zemánek, Pavel
We introduce tunable optofluidic microlasers based on optically stretched, dye-doped emulsion droplets confined in a dual-beam optical trap. Droplets were created in microfuidic chips. Optically trapped microdroplets of oil emulsified in water and stained with fluorescent dye act as an active ultrahigh-Q optical resonant cavities hosting whispering gallery modes (WGMs). All-optical tuning of the laser emission wavelength was achieved by a controlled deformation of the droplet shape using light-induced forces generated by dual-beam optical trap.
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