Institute Of Electronic Materials Technology of Poland

Warsaw, Poland

Institute Of Electronic Materials Technology of Poland

Warsaw, Poland
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Sobon G.,Wroclaw University of Technology | Sotor J.,Wroclaw University of Technology | Pasternak I.,Institute Of Electronic Materials Technology of Poland | Krajewska A.,Institute Of Electronic Materials Technology of Poland | And 3 more authors.
Optics Express | Year: 2013

We report an all-fiber Tm-doped fiber laser mode-locked by graphene saturable absorber. The laser emits 1.2 ps pulses at 1884 nm center wavelength with 4 nm of bandwidth and 20.5 MHz mode spacing. The graphene layers were grown on copper foils by chemical vapor deposition (CVD) and transferred onto the fiber connector end. Up to date this is the shortest reported pulse duration achieved from a Tm-doped laser mode-locked by graphene saturable absorber. Such cost-effective and stable fiber lasers might be considered as sources for mid-infrared spectroscopy and remote sensing. © 2013 Optical Society of America.


Boruc Z.,Institute of Microelectronics and Optoelectronics | Kaczkan M.,Institute of Microelectronics and Optoelectronics | Fetlinski B.,Institute of Microelectronics and Optoelectronics | Turczynski S.,Institute Of Electronic Materials Technology of Poland | Malinowski M.,Institute of Microelectronics and Optoelectronics
Optics Letters | Year: 2012

Temperature dependent emission spectra and decay times of trivalent dysprosium (Dy3+) activated Y4Al2O9 (YAM) crystals have been studied for the first time (to our knowledge). The ratio of emission lines intensity can be used in temperature measurements, as it is not dependent on the variability of absolute intensity. The Boltzmann model was applied for modeling the temperature variation of the 4I 15/2 and 4F9/2 states emissions relative intensities 455 and 481 nm, respectively. The calculated approximation gives highest sensor sensitivity of about 3 × 10-3°C-1 for the 600°C-800°C range, which allows for an expectation of usefulness of Dy3+:YAM in high-temperature luminescence thermometry. Also, the measured decay times are suitable for temperature sensing. © 2012 Optical Society of America.


Chmielewski M.,Institute Of Electronic Materials Technology of Poland | Weglewski W.,Polish Institute of Fundamental Technological Research
Bulletin of the Polish Academy of Sciences: Technical Sciences | Year: 2013

Copper-based composites could be widely used in automotive, electronic or electrical industry due to their very promising thermal properties. In the present paper, Cu-AlN metal matrix composites with ceramic volume fractions between 0.1 and 0.4 were fabricated by hot pressing method in vacuum. Dependence of the coefficient of thermal expansion (CTE) and the thermal conductivity (TC) on the chemical composition of composites has been investigated. The measured values of the thermal expansion coefficient have been compared with the analytical models' predictions. A numerical model based on FEAP 7.5 in 3D space has been used to evaluate the influence of the porosity on the thermal properties (thermal conductivity) of the composite. A fairly good correlation between the FEM results and the experimental measurements has been obtained.


Krupka J.,Warsaw University of Technology | Strupinski W.,Institute Of Electronic Materials Technology of Poland
Applied Physics Letters | Year: 2010

Single postdielectric resonators operating on their quasi TE011 modes were used for the measurement of the surface resistance and conductivity of graphene films grown on semi-insulating SiC substrates. With this technique the surface resistance was measured with an uncertainty of ±5% and the conductivity was evaluated with an uncertainty equal to the uncertainty in determining the film thickness. The room temperature conductivity of the graphene films proved to be in the range 5× 106 to 6.4× 106 S/m. © 2010 American Institute of Physics.


Martynkien T.,Wroclaw University of Technology | Pysz D.,Institute Of Electronic Materials Technology of Poland | Stepien R.,Institute Of Electronic Materials Technology of Poland | Buczynski R.,Institute Of Electronic Materials Technology of Poland | Buczynski R.,University of Warsaw
Optics Letters | Year: 2014

We present a new approach for the development of all-solid microstructured fiber with flat all-normal dispersion in the broadband range of 1550?2500 nm. The use of two soft glasses gives additional degrees of freedom in the design of microstructured fibers. As a result, we have designed and developed a fiber optimized for supercontinuum generation with 1550 nm pulsed lasers in the all-normal dispersion regime within an infrared range, beyond the fused silica glass limit. The measurement of the chromatic dispersion of the manufactured fibers was performed with a white light interferometric method in the spectral range 900?1650 nm. We demonstrate very good agreement between the full vector finite element simulations and the measurement results. © 2014 Optical Society of America.


Sotor J.,Wroclaw University of Technology | Sobon G.,Wroclaw University of Technology | Grodecki K.,University of Warsaw | Grodecki K.,Institute Of Electronic Materials Technology of Poland | Abramski K.M.,Wroclaw University of Technology
Applied Physics Letters | Year: 2014

In this Letter, we demonstrate a mode-locked Er-doped fiber laser incorporating antimony telluride (Sb2Te3) topological insulator (TI) as a saturable absorber (SA). The laser was capable of generating 270 fs-short soliton pulses at 1560 nm wavelength, which are the shortest solitons generated with a Tl-based saturable absorber so far. In order to form a saturable absorber, a bulk piece of Sb2Te3 was deposited on a side-polished single-mode fiber with the presence of a low refractive index polymer. Such saturable absorber exhibits modulation depth at the level of 6% with less than 3dB of nonsaturable losses. Our study shows that Tl-based saturable absorbers with evanescent field interaction might compete with SAs based on carbon nanomaterials, like graphene or nanotubes. Additionally, thanks to the interaction with the evanescent field, the material is not exposed to high optical power, which allows to avoid optical or thermal damage. © 2014 AIP Publishing LLC.


Soluch W.,Institute Of Electronic Materials Technology of Poland
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control | Year: 2011

Surface acoustic wave (SAW) synchronous twoport resonators were fabricated and measured on several orientations of the GdCa4O(BO 3)3 crystal. Resonance frequencies, insertion losses, and unloaded quality factors of the resonators, measured at room temperature, were in the ranges of about 432.3 to 437.5 MHz, 3.8 to 6.3 dB, and 6500 to 7500, respectively. The properties of this crystal, such as its lack of a phase transition up to its melting temperature of about 1500°C, a SAW temperature coefficient of frequency of about -80 ppm/°C, and good parameters of the resonators make the crystal attractive for high-temperature sensor applications. © 2006 IEEE.


Sobon G.,Wroclaw University of Technology | Sotor J.,Wroclaw University of Technology | Pasternak I.,Institute Of Electronic Materials Technology of Poland | Krajewska A.,Institute Of Electronic Materials Technology of Poland | And 2 more authors.
Optics Express | Year: 2015

We report an all-fiber, all-polarization maintaining (PM) ultrafast Tm-doped fiber laser mode-locked by a multilayer graphene-based saturable absorber (SA). The laser emits 603 fs-short pulses centered at 1876 nm wavelength with 6.6 nm of bandwidth and 41 MHz repetition rate. Graphene used as saturable absorber was obtained via chemical vapor deposition (CVD) on copper substrate and immersed in a poly(methylmethacrylate) (PMMA) support, forming a stable, free-standing foil containing 12 graphene layers, suitable for the use in a fiber laser. The generated 603 fs pulses are the shortest reported pulses achieved from a Tm-doped laser mode-locked by graphene saturable absorber so far. Additionally, this is the first demonstration of an all-PM Tm-doped fiber laser incorporating a graphene-based SA. Such cost-effective, compact and stable fiber lasers might be considered as sources usable in nonlinear frequency conversion, mid-infrared spectroscopy and remote sensing. ©2015 Optical Society of America.


Soluch W.,Institute Of Electronic Materials Technology of Poland
Sensors and Actuators, A: Physical | Year: 2016

Measurement methods and results presented in the title paper were critically analyzed. It was shown that for two-port device, the measured transmission losses are caused not by Rayleigh type surface acoustic wave (SAW) but are the result of interference of the bulk acoustic wave (BAW), generated and detected by interdigital transducers (IDT), and the electrical feedthrough at frequencies higher than that of SAW. Therefore, the measured reflection losses of one-port device, are the results of BAW radiation by the IDT. No resonances exist in both type of devices. © 2015 Elsevier B.V.


Bajor A.L.,Institute Of Electronic Materials Technology of Poland
Optik | Year: 2013

The prism (minimum deviation) method of measurement of refractive indices in solids has a couple of disadvantages including problems associated with manufacturing of a good prism itself. Besides this method is unsuitable to be used in piezo- and electro-optical experiments when one needs to achieve so-called homogeneous distribution of an interaction (electric field, stress, strain) within the sample. Besides, worked out with a large expenditure of energy and cost, the prism is usually useless in other applications (destructive method). Therefore, an "elder" method of measurement of refractive indices by measuring shift of the refracted beam of light in a plane-parallel plate has been reconsidered in this paper. The sample itself may be a cuboid (if one wishes to measure all of three principal refractive indices in optically biaxial crystal), or just a crystalline boule in which one is cutting off the conical and tail parts and by suitable mechanical treatment (lapping and polishing) reveals a pair of plane parallel surfaces properly oriented to crystallographic (or principal axes of the optical indicatrix) directions. In such case, however, one can only measure one (isotropic crystals) or two (optically uniaxial crystals) refractive indices. However, in case of this method as opposed to the prism method one can repeat the measurement a couple of times, e.g. after a series of consecutive annealing, when this is either impossible or undesirable to cut the boule into smaller pieces prior to the final annealing (nondestructive method). The error depends on the angle of incidence and on sample (boule) thickness and is usually of the order of 0.001. However, in the future it is expected that the error can be reduced by implementing an electronic readout of the beam shift below 1 μm. Working of the method has been illustrated with a couple of examples in GdCOB (biaxial), LiNbO3 (uniaxial) and YAG:Cr,Mg (isotropic) crystals. © 2013 Elsevier GmbH.

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