Dr. Radek Šmíd Profile

Dr. Radek Šmíd

at Institute of Scientific Instruments of the CAS vvi

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Author

Publications (22)

Proceedings Article | 23 December 2016 Paper

Length measurement in absolute scale via low-dispersion optical cavity

Lenka Pravdova, Adam Lesundak, Radek Smid, Jan Hrabina, Simon Rerucha, Ondrej Cip

Proceedings Volume 10142, 101420T (2016) https://doi.org/10.1117/12.2264452

KEYWORDS: Actuators, Mirrors, Ferroelectric materials, Femtosecond phenomena, Interferometers, Silver, Optical testing, Frequency combs, Distance measurement, Optical resonators

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Proceedings Article | 6 January 2015 Paper

Repetition rate multiplication of a femtosecond frequency comb

Adam Lešundák, Radek Šmíd, Dirk Voigt, Martin Čížek, Steven van den Berg, Ondřej Číp

Proceedings Volume 9450, 94501L (2015) https://doi.org/10.1117/12.2074415

KEYWORDS: Optical filters, Mirrors, Ferroelectric materials, Femtosecond phenomena, Linear filtering, Fiber lasers, Frequency combs, Electronic filtering, Dielectric mirrors, Femtosecond frequency combs

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Proceedings Article | 1 May 2014 Paper

Suppression of frequency noise of single mode laser with unbalanced fiber interferometer for subnanometer interferometry

Radek Šmíd, Martin Čížek, Břetislav Mikel, Josef Lazar, Ondrej Číp

Proceedings Volume 9132, 913212 (2014) https://doi.org/10.1117/12.2052966

KEYWORDS: Clocks, Modulation, Interferometers, Interferometry, Interference (communication), Fiber lasers, Semiconductor lasers, Laser stabilization, Phase measurement, Signal detection

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Proceedings Article | 1 May 2014 Paper

Remotely manageable system for stabilizing femtosecond lasers

Martin Cizek, Vaclav Hucl, Radek Smid, Bretislav Mikel, Josef Lazar, Ondrej Cip

Proceedings Volume 9135, 913527 (2014) https://doi.org/10.1117/12.2052815

KEYWORDS: Optical amplifiers, Femtosecond phenomena, Oscillators, Control systems, Optical testing, Frequency combs, Laser stabilization, Integrated optics, Laser optics, Digital electronics

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Proceedings Article | 10 October 2013 Paper

Digital approach to stabilizing optical frequency combs and beat notes of CW lasers

Martin Čížek, Ondřej Číp, Radek Šmíd, Jan Hrabina, Břetislav Mikel, Josef Lazar

Proceedings Volume 8916, 89161H (2013) https://doi.org/10.1117/12.2035733

KEYWORDS: Digital signal processing, Continuous wave operation, Femtosecond phenomena, Oscillators, Radio optics, Computing systems, Semiconductor lasers, Frequency combs, Signal processing, Analog electronics

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Proceedings Article | 13 May 2013 Paper

Automatic unit for measuring refractive index of air based on Ciddor equation and its verification using direct interferometric measurement method

V. Hucl, M. Čížek, J. Hrabina, B. Mikel, Š. Řeřucha, Z. Buchta, P. Jedlička, A. Lešundák, J. Oulehla, L. Mrňa, M. Šarbort, R. Šmíd, J. Lazar, O. Číp

Proceedings Volume 8788, 878837 (2013) https://doi.org/10.1117/12.2020756

KEYWORDS: Refractive index, Carbon dioxide, Interferometers, Sensors, Calibration, Interferometry, Humidity, Microcontrollers, Analog electronics, Temperature metrology

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Proceedings Article | 13 May 2013 Paper

Wavelength modulation-based method for interference phase detection with reduced optical complexity

Šimon Řeřucha, Martin Šarbort, Zdeněk Buchta, Bretislav Mikel, Radek Šmíd, Martin Čížek, Petr Jedlička, Jan Řerucha, Josef Lazar, Ondřej Číp

Proceedings Volume 8788, 87883C (2013) https://doi.org/10.1117/12.2020678

KEYWORDS: Laser sources, Photodetectors, Modulation, Interferometers, Phase shift keying, Frequency modulation, Laser interferometry, Homodyne detection, Signal detection, Laser systems engineering

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Proceedings Article | 31 January 2013 Paper

Digital processing of RF signals from optical frequency combs

Martin Cizek, Radek Smid, Zdeněk Buchta, Břetislav Mikel, Josef Lazar, Ondřej Cip

Proceedings Volume 8759, 87591V (2013) https://doi.org/10.1117/12.2015374

KEYWORDS: Laser sources, Digital signal processing, Continuous wave operation, Femtosecond phenomena, Optical signal processing, Demodulation, Semiconductor lasers, Frequency combs, Signal processing, Nonlinear optics

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Proceedings Article | 31 January 2013 Paper

Testing of the scale linearity of the corrected homodyne interferometer by the femtosecond comb and optical resonator

Ondřej Číp, Martin Čížek, Zdeněk Buchta, Bretislav Mikel, Josef Lazar, Radek Šmid

Proceedings Volume 8759, 875943 (2013) https://doi.org/10.1117/12.2017022

KEYWORDS: Mirrors, Tunable lasers, Femtosecond phenomena, Resonators, Interferometers, Laser resonators, Frequency combs, Optical resonators, Homodyne detection, Michelson interferometers

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Proceedings Article | 18 December 2012 Paper

Evaluation of ultra-low expansion spacer in the Fabry-Perot cavity with optical frequency comb

Radek Šmíd, Martin Čížek, Zdeněk Buchta, Josef Lazar, Ondřej Číp

Proceedings Volume 8697, 86970F (2012) https://doi.org/10.1117/12.2010771

KEYWORDS: Fabry–Perot interferometers, Tunable lasers, Femtosecond phenomena, Glasses, Ceramics, Semiconductor lasers, Frequency combs, Optical resonators, Zerodur, Temperature metrology

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Proceedings Article | 18 December 2012 Paper

High-resolution detection of small distance changes by an optical frequency comb

O. Číp, M. Čížek, Z. Buchta, B. Mikel, Josef Lazar, R. Šmíd

Proceedings Volume 8697, 86970G (2012) https://doi.org/10.1117/12.2012651

KEYWORDS: Mirrors, Tunable lasers, Femtosecond phenomena, Resonators, Interferometers, Laser resonators, Frequency combs, Transducers, Optical resonators, Michelson interferometers

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Proceedings Article | 18 December 2012 Paper

Digital processing of signals from femtosecond combs

Martin Čížek, Radek Šmíd, Zdeněk Buchta, Břetislav Mikel, Josef Lazar, Ondrej Číp

Proceedings Volume 8697, 86970H (2012) https://doi.org/10.1117/12.2010591

KEYWORDS: Laser sources, Digital signal processing, Continuous wave operation, Femtosecond phenomena, Radio optics, Demodulation, Frequency combs, Signal processing, Analog electronics, Signal detection

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Proceedings Article | 27 May 2011 Paper

Evaluation of thermal expansion coefficient of Fabry-Perot cavity using an optical frequency comb

Jindřich Oulehla, Radek Šmíd, Zdeněk Buchta, Martin Čížek, Břetislav Mikel, Petr Jedlička, Josef Lazar, Ondřej Číp

Proceedings Volume 8082, 80823Q (2011) https://doi.org/10.1117/12.889810

KEYWORDS: Thermography, Fabry–Perot interferometers, Ferroelectric materials, Femtosecond phenomena, Inspection, Optical testing, Frequency combs, Optical resonators, Measurement devices, Signal detection

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Proceedings Article | 15 December 2010 Paper

Monitor of mirror distance of Fabry-Perot cavity by the use of stabilized femtosecond laser comb

Radek Šmíd, Jan Ježek, Zdeněk Buchta, Martin Čížek, Břetislav Mikel, Josef Lazar, Ondřej Číp

Proceedings Volume 7746, 77460I (2010) https://doi.org/10.1117/12.881891

KEYWORDS: Optical filters, Mirrors, Fabry–Perot interferometers, Femtosecond phenomena, Radio optics, Mode locking, Frequency combs, Atomic clocks, Laser stabilization, Helium neon lasers

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Proceedings Article | 14 May 2010 Paper

Narrow-selection bandwith of femtosecond laser comb with application to changes in optical path distance

Radek Šmíd, Jan Ježek, Zdenêk Buchta, Martin Čížek, Josef Lazar, Ondřej Číp

Proceedings Volume 7718, 771818 (2010) https://doi.org/10.1117/12.854564

KEYWORDS: Optical filters, Refractive index, Mirrors, Fabry–Perot interferometers, Femtosecond phenomena, Fiber Bragg gratings, Mode locking, Frequency combs, Laser stabilization, Helium neon lasers

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Proceedings Article | 17 June 2009 Paper

Precise measurement of the length by means of DFB diode and femtosecond laser

Radek Šmíd, Ondřej Číp, Josef Lazar, Jan Jezek, Bohdan Ružička

Proceedings Volume 7389, 738933 (2009) https://doi.org/10.1117/12.827577

KEYWORDS: Mirrors, Fabry–Perot interferometers, Ferroelectric materials, Femtosecond phenomena, Resonators, Semiconductor lasers, Frequency combs, Diodes, Free space optics, Diffraction gratings

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Proceedings Article | 20 November 2008 Paper

Methods for generation of metrology length etalon based on femtosecond stabilized laser

R. Šmíd, O. Čip, J. Lazar

Proceedings Volume 7141, 71410Q (2008) https://doi.org/10.1117/12.822371

KEYWORDS: Mirrors, Fabry–Perot interferometers, Femtosecond phenomena, Resonators, Teeth, Laser resonators, Frequency combs, Optical resonators, Laser stabilization, Diodes

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Interferometric methods are used for definition of length by distance translation to one of the interferometric arms. The Fabry-Perot interferometer or etalon with very high stable laser produces length etalon sensitive in nanometer scale with linear response to its change. We present in our work improvements of such method by removing the very high stable laser by the femtosecond stabilized optical frequency comb. Train of femtosecond laser pulses produces an optical frequency spectrum separated by equidistant frequency f_rep with frequency offset f_ceo called frequency comb. Stabilized frequency comb generates a very precise frequency rule. Locking the scanning Fabry-Perot interferometer to one of the frequency components could perform length etalon. The Fabry-Perot etalon in simple geometry transmits only the frequencies with integer multiple of f_cav which depends inversely to the mirror spacing. The principle of the first method is based on the direct relation between the repetition frequency of the comb and the etalon length. Fabry-Perot etalon transmits only the optical frequencies of the comb for those f_ceo equal to zero and f_cav is an integer multiple of f_rep. The detected scanning spectrum is characterized by interferogram. The center of the gravity fulfills the condition for direct length transfer between the Fabry-Perot mirror distance length and f_rep of the femtosecond frequency synthesizer. Discrete value of length etalons is obtained. The improvement of the method is based on separation of few optical frequency lines (narrowing the frequency spectrum) from the wide frequency range of the optical frequency synthesizer. It suppresses the presence of the interferogram which has very high demands on the further computer analysis. Widening the scanning Fabry-Perot free spectral range as much as possible enable us to observe each frequency line (line of the comb) only once. The detected scanning spectrum better characterizes the frequency output of the optical frequency synthesizer. This feature enable us to lock the Fabry-Perot intermode distance to one of the detected comb line. Moreover the mirror distance in the Fabry-Perot is arbitrary. We verified the experiment by the fiber based femtosecond stabilized optical frequency synthesizer working at central wavelength 1560 nm and with f_rep 100 MHz. Two He-Ne stabilized lasers for coarse Fabry-Perot mirror spacing length adjustment were separated by different optical polarization. Dielectric multilayer mirror coatings were wavelength dependent. DFB laser diode working on the 1542 nm were added into the set-up. Intermode beat between the frequency comb component and the DFB diode well defines the exact frequency position on which the etalon is locked. Comparison between different Fabry-Perot etalon has been made.

Proceedings Article | 3 October 2008 Paper

Detection and active stabilization of beams position at a high-resolution laser interferometer

Ondřej Číp, Zdeněk Buchta, Martin Čížek, Radek Šmíd, Josef Lazar

Proceedings Volume 7155, 71550X (2008) https://doi.org/10.1117/12.814533

KEYWORDS: Mirrors, Ferroelectric materials, Interferometers, Sensors, Calibration, Distortion, Signal processing, Laser stabilization, Laser metrology, Signal detection

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Proceedings Article | 25 April 2008 Paper

Precision metrology length standard based on femtosecond stabilized laser

R. Šmíd, O. Číp, J. Lazar

Proceedings Volume 6995, 69950M (2008) https://doi.org/10.1117/12.782038

KEYWORDS: Mirrors, Fabry–Perot interferometers, Metrology, Femtosecond phenomena, Resonators, Laser resonators, Frequency combs, Optical resonators, Laser stabilization, Laser metrology

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Proceedings Article | 17 September 2007 Paper

Absolute frequency shifts of iodine cells for laser stabilization

Josef Lazar, Jan Hrabina, František Petru, Petr Jedlička, Ondřej Číp, Radek Šmíd

Proceedings Volume 6673, 66730P (2007) https://doi.org/10.1117/12.735420

KEYWORDS: Photodetectors, Modulation, Luminescence, Fluorescence spectroscopy, Nd:YAG lasers, Laser stabilization, Iodine, Iodine cells, Signal detection, Absorption

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Proceedings Article | 12 September 2007 Paper

A precise length etalon generator controlled by femtosecond mode-locked laser

Radek Šmid, Ondřej Čip, Josef Lazar

Proceedings Volume 6673, 66730O (2007) https://doi.org/10.1117/12.735182

KEYWORDS: Mirrors, Fabry–Perot interferometers, Femtosecond phenomena, Radio optics, Resonators, Mode locking, Laser resonators, Optical resonators, Atomic clocks, Laser stabilization

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Proceedings Article | 18 June 2007 Paper

Measurement of index of refraction of air by optical frequency method

Radek Šmíd, Martin Čížek, Zdeněk Buchta, Břetislav Mikel, Josef Lazar, Ondřej Číp

Proceedings Volume 6616, 66164C (2007) https://doi.org/10.1117/12.726233

KEYWORDS: Refractive index, Tunable lasers, Resonators, Interferometers, Optical testing, Refraction, Distance measurement, Optical resonators, Atmospheric optics, Michelson interferometers

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Showing 5 of 22 publications

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