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Wavelength Standard for Optical Communication in C Band
Růžička, Bohdan ; Wilfert, Otakar (advisor)
The thesis presents design, development and realization of laser system with stabilized optical frequency which could become the basis of an etalon of wavelength for the telecommunication band of the near-infrared spectral region. Semiconductor DFB laser diode is used as a tunable source of radiation with narrow linewidth. Its optimum operation is ensured by especially designed current and temperature controller. The laser is prestabilized using FM spectroscopy technique to the passive Fabry-Perot cavity. This fast feed-back loop is able to improve spectral characteristics of the laser. The center frequency of the F.-P. cavity - the laser optical frequency is locked by a slow second feed-back loop to the absorption spectral line of acetylene 13C2H2 gas. The slow control loop is based on the third derivative spectroscopy technique. Relative stability at the level of 10E-12 was achieved.
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SMV-2019-73: Optical frequency references
Lazar, Josef
Development of optical frequency references with multipath configuration, quartz glass windows, perpendicular to cell axis, plan-parallel, useful aperture 32 mm, resp. 36 mm, cold finger in the center, windows with optical quality surfaces /10 @ 633 nm for the clear aperture with antireflection coating on both sides, residual reflectivity < 0.1% at 532 nm wavelength, high reflection coatings on outer surfaces at ¾ of horizontal diameter of the useful aperture. Filling: Iodine – 127I.
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SMV-2019-72: Optical frequency references
Lazar, Josef
Development of optical frequency references of quartz glass with optical quality windows, useful aperture 24 mm (diameter of the external and internal AR coatings for the 1550 nm wavelength), length 250 mm, filling pin (with transition from quartz glass to pyrex) in the center, windows with surfaces flatness λ/10 @ 633 nm for the clear aperture, filling: Isotopically pure Acetylene.
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SMV-2019-71: : Optical frequency references
Lazar, Josef
Development of optical frequency references with wedged windows with 1° angle, useful aperture 36 mm of quartz glass alternatively with plan-parallel windows, useful aperture 10 mm (diameter of the external and internal AR coatings for the 532 nm wavelength), No cold fingers, windows with optical quality surfaces λ/10 @ 633 nm for the clear aperture. Filling: Iodine – 127I, limited amount referring to saturation temperature υ = 70°C.
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Wavelength Standard for Optical Communication in C Band
Růžička, Bohdan ; Wilfert, Otakar (advisor)
The thesis presents design, development and realization of laser system with stabilized optical frequency which could become the basis of an etalon of wavelength for the telecommunication band of the near-infrared spectral region. Semiconductor DFB laser diode is used as a tunable source of radiation with narrow linewidth. Its optimum operation is ensured by especially designed current and temperature controller. The laser is prestabilized using FM spectroscopy technique to the passive Fabry-Perot cavity. This fast feed-back loop is able to improve spectral characteristics of the laser. The center frequency of the F.-P. cavity - the laser optical frequency is locked by a slow second feed-back loop to the absorption spectral line of acetylene 13C2H2 gas. The slow control loop is based on the third derivative spectroscopy technique. Relative stability at the level of 10E-12 was achieved.
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Frequency stabilization of DBR diode laser working on 633 nm for lenght metrology and spectroscopy
Pham, Minh Tuan ; Hucl, Václav ; Čížek, Martin ; Mikel, Břetislav ; Hrabina, Jan ; Řeřucha, Šimon ; Lazar, Josef ; Číp, Ondřej
Semiconductor lasers are nowadays very convenient and suitable for many applications in field of human activities. Mainly it is thanks to their small size, low cost and high energy efficiency. This work deals with frequency stabilization of DBR diode laser working on 633 nm and the measurements of its noise properties. For this purpose we have chosen DBR diode EYP-DBR-0633 from Eagleyard Photomic. This particular laser diode in temperature range from 6 degrees celsius to 24 degrees Celsius has a tuning range of 0,86 nm, which correspond to change of 650 GHz in optical frequency domain. In this paper we also present methodology and results for frequency noise properties investigation of this laser with unbalanced Mach-Zhender interferometer and 10 m long fibre spool inserted in reference arm.
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Workplace for stabilization of laser frequency
Buchta, Zdeněk
This paper describes a new appliance for demonstration of frequency stabilization of a laser diode. That is an original solution which is appointed for hands-on teaching students of optoelectronic courses. The arrangement consists of a laser diode driver, temperature controller and driver for the photodetector.
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