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Andrei Shchegrov John Khaydarov Stepan Essaian Greg Nemet Suren Soghomonyan Hakob Danielyan Armen Poghosyan Gevorg Gabrielyan 《Journal of the Society for Information Display》2010,18(8):589-595
Abstract— A novel green laser source, based on a monolithic cavity microchip laser platform, has been developed. The laser is designed to be a part of a miniature and efficient RGB light source for microdisplay‐based mobile projector devices. The use of highly efficient, periodically poled MgO‐doped lithium niobate as the non‐linear frequency doubler allows for a significant increase in the overall efficiency of the green microchip laser. Specifically, a 50–150‐mW green output with a wall‐plug efficiency exceeding 10% in the temperature range of greater than 40°C has been demonstrated. A compact package for this laser source with a volume less than 0.33 cm3 is discussed and results of performance tests are presented. 相似文献
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Bezirganyan HP Bezirganyan SE Bezirganyan HH Bezirganyan PH 《Journal of nanoscience and nanotechnology》2007,7(1):306-315
Most important aspect of nanotechnology applications in the information ultrahigh storage is the miniaturization of data carrier elements of the storage media with emphasis on the long-term stability. Proposed two-dimensional ultrahigh-density X-ray optical memory, named X-ROM, with long-term stability is an information carrier basically destined for digital data archiving. X-ROM is a semiconductor wafer, in which the high-reflectivity nanosized X-ray mirrors are embedded. Data are encoded due to certain positions of the mirrors. Ultrahigh-density data recording procedure can e.g., be performed via mask-less zone-plate-array lithography (ZPAL), spatial-phase-locked electron-beam lithography (SPLEBL), or focused ion-beam lithography (FIB). X-ROM manufactured by nanolithography technique is a write-once memory useful for terabit-scale memory applications, if the surface area of the smallest recording pits is less than 100 nm2. In this case the X-ROM surface-storage capacity of a square centimetre becomes by two orders of magnitude higher than the volumetric data density really achieved for three-dimensional optical data storage medium. Digital data read-out procedure from proposed X-ROM can e.g., be performed via glancing-angle incident X-ray micro beam (GIX) using the well-developed X-ray reflectometry technique. In presented theoretical paper the crystal-analyser operating like an image magnifier is added to the set-up of X-ROM data handling system for the purpose analogous to case of application the higher numerical aperture objective in optical data read-out system. We also propose the set-up of the X-ROM readout system based on more the one incident X-ray micro beam. Presented scheme of two-beam data handling system, which operates on two mutually perpendicular well-collimated monochromatic incident X-ray micro beams, essentially increases the reliability of the digital information read-out procedure. According the graphs of characteristic functions presented in paper, one may choose optimally the incident radiation wavelength, as well as the angle of incidence of X-ray micro beams, appropriate for proposed digital data read-out procedure. 相似文献
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Gohar Tsakanova Aida Avetisyan Elena Karalova Liana Abroyan Lina Hakobyan Anna Semerjyan Naira Karalyan Elina Arakelova Violetta Ayvazyan Lusine Matevosyan Arpine Navasardyan Anna Ayvazyan Hakob Davtyan Bagrat Grigoryan Arsen Arakelyan Zaven Karalyan 《International journal of molecular sciences》2022,23(12)
Anemia is a commonly observed consequence of whole-body exposure to a dose of X-ray or gamma irradiation of the order of the mean lethal dose in mammals, and it is an important factor for the determination of the survival of animals. The aim of this study was to unravel the effect of laser-driven ultrashort pulsed electron beam (UPEB) irradiation on the process of erythropoiesis and the redox state in the organism. Wistar rats were exposed to laser-driven UPEB irradiation, after which the level of oxidative stress and the activities of different antioxidant enzymes, as well as blood smears, bone marrow imprints and sections, erythroblastic islets, hemoglobin and hematocrit, hepatic iron, DNA, and erythropoietin levels, were assessed on the 1st, 3rd, 7th, 14th, and 28th days after irradiation. Despite the fact that laser-driven UPEB irradiation requires quite low doses and repetition rates to achieve the LD50 in rats, our findings suggest that whole-body exposure with this new type of irradiation causes relatively mild anemia in rats, with subsequent fast recovery up to the 28th day. Moreover, this novel type of irradiation causes highly intense processes of oxidative stress, which, despite being relatively extinguished, did not reach the physiologically stable level even at the 28th day after irradiation due to the violations in the antioxidant system of the organism. 相似文献
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Jan Holub Hakob Avetisyan Scott Isabelle 《International Journal of Speech Technology》2017,20(1):69-74
This article reports on a multi-lab subjective listening experiment aiming at inter-lab and intra-lab test results repeatability verification. An identical set of speech samples corresponding to contemporary networks has been tested by three independent labs deploying ITU-T P.835 methodology. The tests results have been compared regarding Pearson correlation, RMSE, RMSE* and numbers of opposite pair-wise comparisons. The results show the level of inter-lab and intra-lab repeatability in the case of identical test speech samples utilization and thus confirm the subjective tests are highly repeatable in case they follow recommendation requirements strictly. The tests also show differences in results in case subject expectations are set differently using a wider set of test speech samples (as presented in one of the labs). 相似文献
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Natalia A. Shurpo Sergey V. Serov Alexandra V. Shmidt Hakob L. Margaryan Natalia V. Kamanina 《Diamond and Related Materials》2009,18(5-8):931-934
Due to the unique scheme of the energetic levels and high electron affinity energy of fullerenes and carbon nanotubes, these nanoobjects are widely used for different areas of application including laser and display techniques. In the present paper, the attenuation and switching of the laser beam has been shown, based on the features of electrooptical nematic liquid crystal mesophase under condition of the nanoobjects sensitization. 相似文献
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Hakob Sarukhanyan Sos Agaian Jaakko Astola Karen Egiazarian 《Circuits, Systems, and Signal Processing》2005,24(4):385-400
Binary matrices or (± 1)-matrices have numerous applications in coding, signal processing, and communications. In this paper,
a general and efficient algorithm for decomposition of binary
matrices and the corresponding fast transform is developed. As a
special case, Hadamard matrices are considered. The difficulties
of the construction of 4n-point Hadamard transforms are
related to the Hadamard problem: the question of the existence of
Hadamard matrices. (It is not known whether for every integer n,
there is an orthogonal 4n × 4n matrix with elements ± 1.)
In the derived fast algorithms, the number of real
operations is reduced from O(N2) to O(N log N) compared to
direct computation. The proposed scheme requires no zero padding
of the input data. Comparisions revealing the efficiency of the
proposed algorithms with respect to the known ones are given. In
particular, it is demonstrated that, in typical applications,
the proposed algorithm is significantly more efficient than the
conventional Walsh-Hadamard transform. Note that for Hadamard
matrices of orders ≥ 96 the general algorithm is more
efficient than the classical Walsh-Hadamard transform whose
order is a power of 2. The algorithm has a simple and
symmetric structure. The results of numerical examples are
presented. 相似文献
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Victor V. Belyaev Alexey S. Solomatin Douglas R. Suarez Hakob Margaryan Nune Hakobyan Alexander G. Smirnov 《Journal of the Society for Information Display》2019,27(9):536-542
Liquid crystal (LC) director and refractive index distribution in a cylindrical object (eg, micropore) with different LC boundary conditions have been simulated. Splay and bend configurations were simulated in the LC pores with Franck elastic coefficients K33/K11 ratio from 0.5 to 3. For different LC orientation configurations, parabolic profiles of radial dependence of the refractive index are obtained with focus distance up to 80 mm that makes it possible for application in different LC devices. 相似文献
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