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Artigos de revistas sobre o tema "Optical cycle"

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Autor: Grafiati

Publicado: 1 de junho de 2024

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1

Leblond, H., e D. Mihalache. "Few-optical-cycle dissipative solitons". Journal of Physics A: Mathematical and Theoretical 43, n.º 37 (2 de agosto de 2010): 375205. http://dx.doi.org/10.1088/1751-8113/43/37/375205.

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2

Poppe, A., R. Holzwarth, A. Apolonski, G. Tempea, Ch Spielmann, T. W. Hänsch e F. Krausz. "Few-cycle optical waveform synthesis". Applied Physics B 72, n.º 3 (fevereiro de 2001): 373–76. http://dx.doi.org/10.1007/s003400000526.

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3

Liu, Songyang, Rongqing Tan, Wenning Xu, Fangjin Ning e Zhiyong Li. "Double-Cycle Alternating-Flow Diode Pumped Potassium Vapor Laser". Photonics 11, n.º 5 (23 de abril de 2024): 391. http://dx.doi.org/10.3390/photonics11050391.

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A novel double-cycle alternating-flow diode-pumped potassium vapor laser is proposed, theoretically modeled and simulated. The results show that the optical-to-optical efficiency of the laser increases with increasing gas flow rates, although at high flow rates the rate of increase in efficiency decreases. The optical-to-optical efficiency reaches 74.8% at a pump power density of 30 kW/cm2 and a gas flow rate of 50 m/s. The optical-to-optical efficiency of the laser is greater with a narrow linewidth pump and high buffer gas pressure. The optical-to-optical efficiency of a flow gas cell is higher than that of a static gas cell. There is an optimal gas cell length that provides the highest optical-to-optical efficiency. At higher pump power densities, higher flow rates are required to obtain higher optical-to-optical efficiencies.

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4

Wei, Yue, Kai Xu, Yuling Jiang, Heming Zhao e Gangxiang Shen. "Optimal design for $$p$$ p -Cycle-protected elastic optical networks". Photonic Network Communications 29, n.º 3 (26 de março de 2015): 257–68. http://dx.doi.org/10.1007/s11107-015-0490-6.

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5

Jiménez-Galán, Álvaro, Rui E. F. Silva, Olga Smirnova e Misha Ivanov. "Sub-cycle valleytronics: control of valley polarization using few-cycle linearly polarized pulses". Optica 8, n.º 3 (25 de fevereiro de 2021): 277. http://dx.doi.org/10.1364/optica.404257.

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6

Altrock, Richard C. "Variations of Coronal Radiations at Optical Wavelengths". International Astronomical Union Colloquium 143 (1994): 172–81. http://dx.doi.org/10.1017/s0252921100024672.

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This paper reviews observations of the variation over long and short time scales of solar coronal flux as observed from ground-based optical observatories. This includes data from Fe X, Fe XIV, Ca XV and the white-light electron corona. The various parameters are compared and contrasted as indicators of global coronal structure and output. The overall envelope of Ca XV minimizes before and during sunspot minimum, begins its slow rise in phase with the solar cycle, but maximizes late with strong 150-day oscillations resulting in values of zero at the local minima. Within the sensitivity of the observations, the increase of the envelope from Cycle minimum to maximum is over a factor of 30. Excluding possible secondary maxima and ignoring strong 150-day oscillations, the general envelope of Fe X appears to indicate a slow decline in intensity following sunspot maximum. Earlier observations indicate a Cycle minimum-to-maximum variation of a factor of 2 to 3. Later observations indicate a factor of 4 to 5. The overall picture for Fe XIV indicates that it varies in phase with the sunspot cycle. However, multiple maxima occur. The amplitudes of all observed Cycles are probably approximately equal, and the increase from Cycle minimum to maximum is approximately a factor of 10. The variation of the polarized and unpolarized white light corona is in phase with the sunspot cycle, although it may have a slower decline to minimum than the sunspot number. The increase from Cycle minimum to maximum is a factor of 2 to 3. Notable periodicities seen in the emission-line corona are (approximately) 27, 150, 180, 220 and 340 days and 3.4 years.

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7

Fang Shaobo, 方少波, e 魏志义 Wei Zhiyi. "Sub-Optical-Cycle Coherent Waveform Synthesis". Acta Optica Sinica 39, n.º 1 (2019): 0126006. http://dx.doi.org/10.3788/aos201939.0126006.

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8

Shen, Yunfeng, Baicheng Zhang, ZhangYuan Chen, Wanyi Gu e Anshi Xu. "Leakage cycle in WDM optical networks". Electronics Letters 34, n.º 20 (1998): 1961. http://dx.doi.org/10.1049/el:19981352.

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9

Zhao, Taifei. "Optimal capacity assignment for p-cycle in survivable optical mesh networks". Optical Engineering 45, n.º 12 (1 de dezembro de 2006): 125005. http://dx.doi.org/10.1117/1.2404917.

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10

Ze Hao, Jing Li, Chuangye Wang e Jin Yuan. "Performance study of optical triangular-shaped pulse generation with full duty cycle". Chinese Optics Letters 15, n.º 11 (2017): 110601. http://dx.doi.org/10.3788/col201715.110601.

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11

Liang, Zhongcheng, Hai Ming, Pei Wang, Jiangying Zhang, Jianping Xie e Qijing Zhang. "Nonlinearly optical–optical isomerization cycle in azobenzene liquid crystal polymers". Journal of Applied Physics 90, n.º 12 (15 de dezembro de 2001): 5866–70. http://dx.doi.org/10.1063/1.1415362.

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12

Kong, Fanqi, Hugo Larocque, Ebrahim Karimi, P. B. Corkum e Chunmei Zhang. "Generating few-cycle radially polarized pulses". Optica 6, n.º 2 (30 de janeiro de 2019): 160. http://dx.doi.org/10.1364/optica.6.000160.

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13

Borovik, Aleksandr, e Anton Zhdanov. "LOW-POWER SOLAR FLARES OF OPTICAL AND X-RAY WAVELENGTHS FOR SOLAR CYCLES 21–24". Solar-Terrestrial Physics 6, n.º 3 (22 de setembro de 2020): 16–22. http://dx.doi.org/10.12737/stp-63202002.

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Using data obtained in optical and X-ray wavelengths, we have analyzed solar flare activity for cycles 21–24. Over the last three cycles, solar activity is shown to decrease significantly. As compared to solar cycle 21 (the most active over the last 50 years), in cycle 24 2–4-class large optical flares are 4.4 times rarer; 1-class flares, 8.2 times; and S-class small flares, 4.1 times. The number of X-class flares decreased 3.7 times; M-class flares, 3.2 times. This confirms that secular solar activity trends affect peak values of 11-year cycles. It is shown that optical low-power flares can be accompanied by proton fluxes and X-ray bursts of different intensity, including X-class ones. Ranges of small flare emission in soft X-rays largely overlap with emission ranges of flares of high optical classes. We have confirmed that X-ray emission from solar flares appears on average 2 min before the optical emission. The X-ray maximum for small optical flares and 1-class flares occurs approximately 1 min later; for 2–4-class flares, 2 min.

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14

Liang, Zhihe, e Chunli Xie. "On DRC-cycle covering in optical networks". Journal of High Speed Networks 20, n.º 1 (2014): 41–53. http://dx.doi.org/10.3233/jhs-140486.

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15

Mir, Mustafa, Zhuo Wang, Zhen Shen, Michael Bednarz, Rashid Bashir, Ido Golding, Supriya G. Prasanth e Gabriel Popescu. "Optical measurement of cycle-dependent cell growth". Proceedings of the National Academy of Sciences 108, n.º 32 (25 de julho de 2011): 13124–29. http://dx.doi.org/10.1073/pnas.1100506108.

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16

Poppe, A., R. Holzwarth, A. Apolonski, G. Tempea, C. Spielmann, T. W. Hänsch e F. Krausz. "Erratum to: Few-cycle optical waveform synthesis". Applied Physics B 72, n.º 8 (junho de 2001): 977. http://dx.doi.org/10.1007/s003400100602.

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17

VILLORESI, P., P. BARBIERO, L. POLETTO, M. NISOLI, G. CERULLO, E. PRIORI, S. STAGIRA, C. DE LISIO, R. BRUZZESE e C. ALTUCCI. "Study of few-optical-cycles generation of high-order harmonics". Laser and Particle Beams 19, n.º 1 (janeiro de 2001): 41–45. http://dx.doi.org/10.1017/s0263034601191068.

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The high-order harmonic generation process was studied using laser pump pulses of different duration, down to 7 fs. The time profile of this kind of pulse corresponds to a few optical cycles at the fundamental frequency, and therefore a cycle-to-cycle variation of the maximum amplitude occurs. These facts violate the adiabatic approximation of the generation process, giving rise to new aspects of the physical process. The comparison of results with pulses in the two regimes are reported and discussed. The modeling of the complete generation and propagation process in three dimensions is also presented.

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18

Ridente, Enrico, Matthew Weidman, Mikhail Mamaikin, Clemens Jakubeit, Ferenc Krausz e Nicholas Karpowicz. "Hybrid phase-matching for optical parametric amplification of few-cycle infrared pulses". Optica 7, n.º 9 (25 de agosto de 2020): 1093. http://dx.doi.org/10.1364/optica.395265.

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19

Song, Li Mei, Guang Xin Xing, Peng Qiang Wang, Jiang Tao Xi e Qing Hua Guo. "A 3D Measurement Method Based on Three Frequencies PSP". Applied Mechanics and Materials 701-702 (dezembro de 2014): 471–74. http://dx.doi.org/10.4028/www.scientific.net/amm.701-702.471.

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This paper proposes a method of global phase unwrapping used in multi-frequency three-dimensional (3D) measurements. In this method, three kinds of optical information which change in accordance with trigonometric function (sine or cosine) to the objects. The optical information cycles is P1, P2 and P3. Each waveform should 4-8 steps phase shifts. Then, calculate the phase value of each cycle. The composited phase value of two cycles and the final composited phase value of three cycles are calculated by image shift of each cycle. Finally, calculate the global phase value of each cycle based on the composited phase, thus, all the 3D coordinates of objects can be obtain after 3D reconstruction. The proposed method can solves the object surfaces color changing largely in 3D measurements. This method realizes high precision measurement without spray developer and achieves the protection of the environment.

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20

Borovik, Aleksandr, e Anton Zhdanov. "LOW-POWER SOLAR FLARES OF OPTICAL AND X-RAY WAVELENGTHS FOR SOLAR CYCLES 21–24". Solnechno-Zemnaya Fizika 6, n.º 3 (22 de setembro de 2020): 18–25. http://dx.doi.org/10.12737/szf-63202002.

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Using data obtained in optical and X-ray wavelengths, we have analyzed solar flare activity for cycles 21–24. Over the last three cycles, solar activity is shown to decrease significantly. As compared to solar cycle 21 (the most active over the last 50 years), in cycle 24 2–4-class large optical flares are 4.4 times rarer; 1-class flares, 8.2 times; and S-class small flares, 4.1 times. The number of X-class flares decreased 3.7 times; M-class flares, 3.2 times. This confirms that secular solar activity trends affect peak values of 11-year cycles. It is shown that optical low-power flares can be accompanied by proton fluxes and X-ray bursts of different intensity, including X-class ones. Ranges of small flare emission in soft X-rays largely overlap with emission ranges of flares of high optical classes. We have confirmed that X-ray emission from solar flares appears on average 2 min before the optical emission. The X-ray maximum for small optical flares and 1-class flares occurs approximately 1 min later; for 2–4-class flares, 2 min.

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21

Chia, Shih-Hsuan, Giovanni Cirmi, Shaobo Fang, Giulio M. Rossi, Oliver D. Mücke e Franz X. Kärtner. "Two-octave-spanning dispersion-controlled precision optics for sub-optical-cycle waveform synthesizers". Optica 1, n.º 5 (4 de novembro de 2014): 315. http://dx.doi.org/10.1364/optica.1.000315.

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22

Weigand, R. "Titanium:sapphire laser oscillator delivering two-optical-cycle pulses". Optica Pura y Aplicada 46, n.º 2 (6 de junho de 2013): 105–10. http://dx.doi.org/10.7149/opa.46.2.105.

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23

Bartels, Randy, Sterling Backus, Gleb Vdovin, Ivan P. Christov, Margaret M. Murnane e Henry C. Kapteyn. "Sub-Optical-Cycle Coherent Control In Nonlinear Optics". Optics and Photonics News 11, n.º 12 (1 de dezembro de 2000): 23. http://dx.doi.org/10.1364/opn.11.12.000023.

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24

Sazonov, S. V. "Few-Cycle Optical Pulses in the Gain Media". Journal of Physics: Conference Series 1283 (julho de 2019): 012013. http://dx.doi.org/10.1088/1742-6596/1283/1/012013.

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25

Seunarine, K., N. Gadegaard, M. O. Riehle e C. D. W. Wilkinson. "Optical heating for short hot embossing cycle times". Microelectronic Engineering 83, n.º 4-9 (abril de 2006): 859–63. http://dx.doi.org/10.1016/j.mee.2005.12.026.

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26

Sansone, G., E. Benedetti, C. Vozzi, S. Stagira e M. Nisoli. "Attosecond metrology in the few-optical-cycle regime". New Journal of Physics 10, n.º 2 (29 de fevereiro de 2008): 025006. http://dx.doi.org/10.1088/1367-2630/10/2/025006.

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27

Sokolov, A. V. "Single-cycle optical pulses synchronized with molecular oscillations". Applied Physics B: Lasers and Optics 77, n.º 2-3 (1 de setembro de 2003): 343–47. http://dx.doi.org/10.1007/s00340-003-1232-5.

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28

Menailava, D. N., e M. B. Shundalau. "Optical Cycle Modelling for RbYb and CsYb Molecules". Journal of Applied Spectroscopy 84, n.º 4 (setembro de 2017): 543–48. http://dx.doi.org/10.1007/s10812-017-0508-1.

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29

Manzoni, Cristian, Oliver D. Mücke, Giovanni Cirmi, Shaobo Fang, Jeffrey Moses, Shu-Wei Huang, Kyung-Han Hong, Giulio Cerullo e Franz X. Kärtner. "Coherent pulse synthesis: towards sub-cycle optical waveforms". Laser & Photonics Reviews 9, n.º 2 (2 de janeiro de 2015): 129–71. http://dx.doi.org/10.1002/lpor.201400181.

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30

Szigeti, János, Ricardo Romeral, Tibor Cinkler e David Larrabeiti. "P-cycle Protection in multi-domain optical networks". Photonic Network Communications 17, n.º 1 (13 de setembro de 2008): 35–47. http://dx.doi.org/10.1007/s11107-008-0141-2.

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31

Retnani, Dewi Ria, Rina Royani, Christopher Beccles e Abderrachid Afras. "Improving Science Learning Outcomes on Light and Optical Instruments Through Visual Methods in Junior High Schools". Schrödinger: Journal of Physics Education 5, n.º 1 (20 de março de 2024): 32–38. http://dx.doi.org/10.37251/sjpe.v5i1.883.

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Purpose of the study: to improve science learning outcomes about light and optical devices through visual methods (learning by observing and describing) in class VIII junior high school students. Methodology: This type of research is classroom action research which is carried out in two cycles, namely cycle I and cycle II, each cycle contains planning, implementation, observation and reflection. The data collection method includes tests in the form of questions. Data analysis was carried out by calculating the achievement of learning outcomes for each cycle with an increase in classical completeness criteria, namely 85%. Main Findings: The research results show an increase in student learning outcomes through visual methods (learning by observing and describing) on the topic of light and optical devices. This research was successful with the average score increasing from 57.85% to 65.18% in the pre-cycle, increasing 21.42% in the first cycle, and reaching a class average of 81.42% with 96.42% completeness in the first cycle. cycle II, exceeding the target of 85% for classical completeness. Novelty/Originality of this study: The results of this research can contribute to scientific studies, especially on visual methods in learning in junior high schools. This research can be a guide for teachers to create interesting, effective and innovative learning, as well as increase students' enthusiasm for learning in science lessons through visual methods (learning by observing and imagining).

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32

Huang, J., M. Pang, X. Jiang, F. Köttig, D. Schade, W. He, M. Butryn e P. St J. Russell. "Sub-two-cycle octave-spanning mid-infrared fiber laser". Optica 7, n.º 6 (21 de maio de 2020): 574. http://dx.doi.org/10.1364/optica.389143.

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33

Beetar, John E., M. Nrisimhamurty, Tran-Chau Truong, Garima C. Nagar, Yangyang Liu, Jonathan Nesper, Omar Suarez et al. "Multioctave supercontinuum generation and frequency conversion based on rotational nonlinearity". Science Advances 6, n.º 34 (agosto de 2020): eabb5375. http://dx.doi.org/10.1126/sciadv.abb5375.

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The field of attosecond science was first enabled by nonlinear compression of intense laser pulses to a duration below two optical cycles. Twenty years later, creating such short pulses still requires state-of-the-art few-cycle laser amplifiers to most efficiently exploit “instantaneous” optical nonlinearities in noble gases for spectral broadening and parametric frequency conversion. Here, we show that nonlinear compression can be much more efficient when driven in molecular gases by pulses substantially longer than a few cycles because of enhanced optical nonlinearity associated with rotational alignment. We use 80-cycle pulses from an industrial-grade laser amplifier to simultaneously drive molecular alignment and supercontinuum generation in a gas-filled capillary, producing more than two octaves of coherent bandwidth and achieving >45-fold compression to a duration of 1.6 cycles. As the enhanced nonlinearity is linked to rotational motion, the dynamics can be exploited for long-wavelength frequency conversion and compressing picosecond lasers.

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34

So, I. A., A. B. Plachenov e A. P. Kiselev. "Unidirectional Single-Cycle and Sub-Cycle Pulses". Optics and Spectroscopy 128, n.º 12 (dezembro de 2020): 2000–2001. http://dx.doi.org/10.1134/s0030400x20121054.

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35

Flender, Roland, Adam Borzsonyi e Viktor Chikan. "The role of asymmetry in few-cycle, mid-IR pulses during THz pulse generation". Journal of Optics 24, n.º 4 (22 de fevereiro de 2022): 045502. http://dx.doi.org/10.1088/2040-8986/ac5289.

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Abstract The efficiency of terahertz (THz) pulse generation improves at longer driving wavelengths. For this reason, the use of mid-infrared (MIR) sources is more advantageous compared to visible or near-infrared systems. In this work, we investigate how single-color and two-color schemes of MIR pulses with few-cycle pulse durations compare in producing THz pulses. The results reveal that as the duration of the driving pulses decreases, the second harmonic generation crystal can be omitted from the system. Our numerical study pinpointed three regions where the optimal pulse parameters are fundamentally different for the most efficient THz pulse generation. The first is the two-color approach, where the two-color scheme is dominant at 3.2 optical cycles and over. The second is the single-color approach, where the single-color scheme becomes dominant at 1.7 optical cycles and below. Therefore, it simplifies the traditional two-color scheme for THz pulse generation. There is also a third transitional region where the two-color scheme still prevails, but the sign of the relative phase between the input pulses becomes important. Considering the effect of the relative phase and the carrier to envelope phase (CEP) effect on the THz pulse generation, the results have shown that as the pulse duration become shorter, the role of the CEP becomes important for efficient THz generation. By measuring the efficiency of the THz generation in this optical arrangement, quantifying the CEP becomes possible, which could become an important experimental tool for few-cycle, MIR laser technology.

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36

Brida, D., M. Marangoni, C. Manzoni, S. De Silvestri e G. Cerullo. "Two-optical-cycle pulses in the mid-infrared from an optical parametric amplifier". Optics Letters 33, n.º 24 (4 de dezembro de 2008): 2901. http://dx.doi.org/10.1364/ol.33.002901.

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37

Alves, Joana, Hugo Pires, Celso P. João e Gonçalo Figueira. "Multi-mJ Scaling of 5-Optical Cycle, 3 µm OPCPA". Photonics 8, n.º 11 (9 de novembro de 2021): 503. http://dx.doi.org/10.3390/photonics8110503.

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We present the design of an ultrafast optical parametric chirped pulse amplifier (OPCPA) operating at 3 µm yielding few-cycle pulses and multi-mJ output energy. This design demonstrates that with a configuration of a single crystal or combination of crystals (KTA and MgO:LN) it is possible to achieve output energies above the mJ with sufficient bandwidth to allow compression to just 5-optical cycles. Here, we consider a 1 µm mJ-level picosecond chirped pulse amplifier (CPA), a typical pumping source for this type of non-linear amplifiers. Compression with a simple bulk material enables reaching close to the pulse Fourier-transform limited duration, paving the way to high energy, ultrafast mid-infrared pulses.

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38

Toe, May Zin, Wai Kian Tan, Hiroyuki Muto, Go Kawamura, Atsunori Matsuda e Swee-Yong Pung. "Evaluation of the Structural, Optical and Photoconversion Efficiency of ZnO Thin Films Prepared Using Aerosol Deposition". Applied Sciences 13, n.º 3 (1 de fevereiro de 2023): 1905. http://dx.doi.org/10.3390/app13031905.

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As compared to other deposition techniques such as atomic layer deposition, chemical vapour deposition and sputtering, aerosol deposition (AD) is a simple and cost-effective technique to produce ZnO thin films. In this work, the effect of deposition cycles on the structural, optical, and photo-conversion efficiency (PCE) of dye sensitized solar cells of ZnO thin films deposited by AD (AZ) was systematically studied. The structural, optical, and PCE% of two-cycle deposited ZnO thin film (AZ-II) exhibited the highest performance. Further increment in deposition cycle caused deterioration in the structural, optical, and PCE performance. The thickness of ZnO thin films decreased due to abrasion of the deposited film by the subsequent stream of highly energetic ZnO particles. Loosely bound particles could be found on the surface of ZnO thin film after three deposition cycles (AZ-III). The AZ-III films exhibited poor crystal quality, with many crystal defects such as interstitial oxygen as suggested in room temperature photoluminescence analysis.

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39

Yamashita, Mikio. "Generation of Single-Cycle Optical Pulses and its Prospect". Review of Laser Engineering 33, Supplement (2005): S3—S4. http://dx.doi.org/10.2184/lsj.33.s3.

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40

Wang Yanhai, 王艳海. "Two-Stage Noncollinear Optical Parametric Amplification Approaching Single Cycle". Acta Optica Sinica 35, n.º 8 (2015): 0819002. http://dx.doi.org/10.3788/aos201535.0819002.

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41

Brabec, Thomas, e Ferenc Krausz. "Nonlinear Optical Pulse Propagation in the Single-Cycle Regime". Physical Review Letters 78, n.º 17 (28 de abril de 1997): 3282–85. http://dx.doi.org/10.1103/physrevlett.78.3282.

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42

Zabolotskii, A. A. "Integrable equations of a few cycle optical pulse propagation". European Physical Journal Special Topics 173, n.º 1 (junho de 2009): 193–222. http://dx.doi.org/10.1140/epjst/e2009-01074-x.

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43

Kim, Tae Shik, Hyun-Sang Park, Sun-Joo Jang, Joon Woo Song, Han Saem Cho, Sunwon Kim, Brett E. Bouma, Jin Won Kim e Wang-Yuhl Oh. "Single cardiac cycle three-dimensional intracoronary optical coherence tomography". Biomedical Optics Express 7, n.º 12 (1 de novembro de 2016): 4847. http://dx.doi.org/10.1364/boe.7.004847.

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44

Mennickent, Ronald E., Zbigniew Kołaczkowski, Gojko Djurasevic, M. Diaz e Ewa Niemczura. "Optical Spectroscopy of V393 Scorpii During its Long Cycle". Proceedings of the International Astronomical Union 7, S282 (julho de 2011): 317–18. http://dx.doi.org/10.1017/s1743921311027694.

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AbstractV393 Scorpii is a bright Galactic Double Periodic Variable showing a long photometric cycle of ≈253 days. The ASAS V-band light curve has been disentangled into an orbital and long cycle component. The orbital light curve was modeled with two stellar components and a circumprimary accretion disk. Based on this model, and the careful choice of a template spectrum for the donor, the contribution of the donor to the line+continuum spectrum was removed at every orbital phase. The remaining residual spectra were analyzed. Notable findings are the larger line emissivity observed during the long cycle maximum that is concentrated to low velocities and the presence of discrete absorption components in the wings of the OI 7773 line, whose visibility strongly depends on the orbital phase. In addition, weak emission is observed in donor metallic absorption lines. Finally, we present the first Hα Doppler map for V 393 Scorpii. A modulated wind explains many observational features.

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