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10. Passive optical resonator for OSQAR LSW experiment

Author

Miroslav Sulc, S. Kunc, G Messineo, and Matthias Schott

Subjects
Physics, Large Hadron Collider, business.industry, Physics::Optics, Sense (electronics), law.invention, Finesse, Resonator, Optics, Solid-state laser, law, Optical cavity, Photonics, business, Diode
Abstract

This paper treats the issue of locking a solid state laser, pumped by high power diodes (Verdi V5), to a twenty meter long optical resonator for OSQAR LSW - light shining through the wall, dark matter search experiment. In this paper the optical design and a possible locking scheme are presented. The environmental conditions in SM18 testing hall at CERN, where OSQAR experiment is based, are discussed. The main focus is put on the vibration analysis, cavity transversal modes behaviour, possible clipping in the anticryostat of LHC – Large Hadron Collider magnet bore and locking loop parameters required for future experimental testing. The expected finesse of resonator will be presented and discussed in the sense of OSQAR LSW; its impact on possible new exclusion limits is discussed.

Published
2016
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11. High sensitive method for optical birefringence measurement

Author

S. Kunc and Miroslav Sulc

Subjects
Optical amplifier, Materials science, Birefringence, business.industry, Polarization-maintaining optical fiber, Laser, Polarization (waves), law.invention, Optics, Optical path, law, Optical cavity, business, Cotton–Mouton effect
Abstract

A sensitive method for optical birefringence measurement is presented. To optimize the signal over the noise ratio, the polarization of the laser beam is modulated exceptionally with a high frequency electro-optical modulator. The specially developed optical apparatus exhibits high sensitivity and accuracy, which were checked by measuring the Cotton-Mouton effect in nitrogen as a function of the pressure. It is able to measure the retardance down to 2x10(-4) rad. This apparatus will be used with the locked optical cavity. The optical cavity will serve as an optical path multiplier for increasing the sensitivity. This proposed set-up will be able to measure the Cotton-Mouton effect in helium, where the birefringence effect is Delta n approximate to 2.4x10(-16).

Published
2015
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12. Jamin interferometer for precise measurement of refractive index of gases

Author

Miroslav Sulc

Subjects
Physics, Cherenkov detector, business.industry, Particle identification, Ring-imaging Cherenkov detector, law.invention, Interferometry, Optics, law, Astronomical interferometer, Jamin interferometer, business, Refractive index, Cherenkov radiation
Abstract

Modified folded Jamin interferometer for on-line measurement of refractive index of gases was designed, constructed and tested. The accuracy of this interferometer is better than 10 -6 and can be still approved about two orders by appropriate mathematical method. Interferometer is almost vibration insensitive with vibration noise equivalent to refractive index variation 2·10 -9 . The interferometer qualities were tested by air refractive index monitoring. Keywords: folded Jamin interferometer, refractive index of gas. 1. INTRODUCTION The Cerenkov detectors are often used for particle identification in particle physics experiments. Cherenkov radiation appears when charged particle is passing through dielectric medium with the velocity v higher then speed of light in these medium c/n . Cherenkov photons spreads at cones with angles with respect to the particle trajectory. Knowledge of this angle can give us an informational about velocity and momentum of particles from the basic relation cos = c/(n·v) . The precise knowledge of refractive index can incr ease the accuracy of particle identification. Standard solution, used at Cherenkov detector experiments, calculates the values of refractive index n retrospectively from the data (knowledge of particle momenta and velocities), r eceived from monitoring of high amount of particles. It is made at fixed time intervals, typically once per day. The obtained averaged value is applied in particle analyses algorithm for all data batch. The on-line monitoring of refractive index environment-caused changes can give to us more precise information. Development of on-line monitoring method is important also for ring imaging Cherenkov detector (RICH) at COMPASS experiment at CERN

Published
2015
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13. Super-polishing of Zerodur aspheres by means of conventional polishing technology

Author

Ondřej Matoušek, Ivana Polakova, Jaroslav Polák, Eva Klepetková, Eduard Šubert, František Procháska, Miroslav Sulc, David Tomka, and Josef Pošmourný

Subjects
Optics, Materials science, Best fit sphere, business.industry, Rms roughness, Slurry, Surface roughness, Polishing, Zerodur, business
Abstract

This paper describes a quest to find simple technique to superpolish Zerodur asphere (55μm departure from best fit sphere) that could be employed on old fashion way 1-excenter optical polishing machine. The work focuses on selection of polishing technology, study of different polishing slurries and optimization of polishing setup. It is demonstrated that either by use of fine colloidal CeO2 slurry or by use of bowl-feed polishing setup with CeO2 charged pitch we could reach 0.4nm RMS roughness while removing

Published
2015
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14. Recent progress in opto-mechanical design of cavity developed for the OSQAR experiment

Author

Josef Zicha, Miroslav Sulc, Karolina Macúchová, Jan Hošek, and Šárka Němcová

Subjects
Physics, Photon, Birefringence, business.industry, Magnetism, Measure (physics), Physics::Optics, Precision mechanics, Laser, law.invention, Magnetic field, Optics, law, Optical cavity, business
Abstract

Two optical methods are used in the laser-based experiment OSQAR at CERN for the search of axions and axion-like particles. The first method looks as light shining through the wall. The second one wants to measure the ultra-fine vacuum magnetic birefringence. Both methods have reached its attainable limits of sensitivity. Present work is focused on increasing the number of photons and their endurance time within the magnetic field using a laser cavity. Presented paper covers recent state of development of a prototype of a 1 meter long laser cavity which is the prerequisite of further development of the experiment.

Published
2013
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15. Aryl sulfonates as neutral photoacid generators (PAGs) for EUV lithography

Author

Tooru Tsuchihashi, Ryan Callahan, Hideaki Tsubaki, James M. Blackwell, E. Steve Putna, Robert Sulc, Antonio G. DiPasquale, Todd R. Younkin, and Katherine Esswein

Subjects
Materials science, Sulfonium, Aryl, Extreme ultraviolet lithography, Nanotechnology, Photoresist, law.invention, chemistry.chemical_compound, Sulfonate, chemistry, Resist, law, Photolithography, Lithography
Abstract

EUV lithography (EUVL) is a leading candidate for printin g sub-32 nm hp patterns. In order for EUVL to be commercially viable at these dimensions, a continuous e volution of the photoresist material set is required to simultaneously meet the aggressive specifications for reso lution, resist sensitivity, LWR, and outgassing rate. Alternative PAG designs, especially if tailored for EUVL, ma y aid in the formation of a material set that helps achieve these aggressive targets. We describe the preparation, characterization, and lithographic evaluation of aryl sulfonates as non-ionic or neutral photoacid generators (PAGs) for EUVL. Full lithographic characterization is reported for our first ge neration resist formulation using compound H , MAP-1H-2.5 . It is benchmarked against MAP-1P-5.0 , which contains the well-known sulfonium PAG, triphenylsulfonium triflate (compound P ). Z-factor analysis indicates nZ 32 = 81.4 and 16.8 respectively, indicating that our first generation aryl sulfonate formulati ons require about 4.8x improvement to match the results achieved with a model onium PAG. Improving the acid generation efficiency and use of the generated byproducts is key to the continued optimization of this class of PAGs. To that end, we believe EI-M S fragmentation patterns and molecular simulations can be used to understand and optimize the nature and efficiency of electron-induced PAG fragmentation.

Published
2009
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17. Temperature dependence of electro-optic coefficients of LiNbO 3 crystals

Author

Miroslav Sulc

Subjects
Cryostat, Range (particle radiation), Materials science, business.industry, Atmospheric temperature range, Laser, law.invention, Crystal, Interferometry, Optics, law, Atomic physics, business, Constant (mathematics), Closed circuit
Abstract

Linear electro-optic coefficients r 13 and r 33 of LiNbO 3 crystal were measured in the setup of Mach-Zehnder interferometer with He-Ne laser. Sample was placed in closed circuit He cryostat, so temperature dependency was investigated from 150K to 330K. Electro-optical coefficients r 33 and r 13 were constant in this temperature range. In the measured frequency range 200 Hz-10 kHz, there is no change of the E-O coefficients with frequency.

Published
2003
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20. Tunable Fe,Cr:ZnMgSe gain-switched mid-IR laser operating at room temperature

Author

Jelínková, Helena, primary, Doroshenko, Maxim E., additional, Sulc, Jan, additional, Jelínek, Michal, additional, Nemec, Michal, additional, Cech, Miroslav, additional, Basiev, Tasoltan T., additional, Zagoruiko, Y. A., additional, Kovalenko, N. O., additional, Gerasimenko, A. S., additional, Puzikov, V. M., additional, and Komar, V. K., additional

Published
2012
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22. Cr:ZnSe laser pumped with Tm:YAP microchip laser

Author

Koranda, Petr, primary, Sulc, Jan, additional, Doroshenko, Maxim, additional, Jelinková, Helena, additional, Basiev, Tasoltan T., additional, Osiko, Vjatcheslav, additional, Badikov, V. V., additional, and Badikov, D., additional

Published
2010
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35. High-power laser radiation delivery

Author

Jelinkova, Helena, primary, Nemec, Michal, additional, Sulc, Jan, additional, Cerny, Pavel, additional, Miyagi, Mitsunobu, additional, Shi, Yi-Wei, additional, and Matsuura, Yuji, additional

Published
2003
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41. Calculi fragmentation of Er:YAG laser light through a sealed flexible hollow fiber delivery system

Author

Iwai, Katsumasa, primary, Shi, Yi-Wei, additional, Nito, Koh, additional, Matsuura, Yuji, additional, Kasai, Takao, additional, Miyagi, Mitsunobu, additional, Saito, Seichi, additional, Arai, Youichi, additional, Ioritani, Naomasa, additional, Okagami, Yoshihide, additional, Nemec, Michal, additional, Sulc, Jan, additional, Jelinkova, Helena, additional, Zavoral, Miroslav, additional, Kohler, Oto, additional, and Drlik, Pavel, additional

Published
2003
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49. YAG laser in ophthalmology

Author

Jelinkova, Helena, primary, Pasta, Jiri, additional, Sulc, Jan, additional, Nemec, Michal, additional, Miyagi, Mitsunobu, additional, Shi, Yi-Wei, additional, and Matsuura, Yuji, additional

Published
2002
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