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Norihiko Nishizawa - One of the best experts on this subject based on the ideXlab platform.
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Dispersion Management of Polarization Maintaining Er-Doped Figure 9 Ultrashort Pulse Fiber Laser
2019 Conference on Lasers and Electro-Optics (CLEO), 2019Co-Authors: Hayato Suga, Masahito Yamanaka, Norihiko NishizawaAbstract:We investigated dispersion management of polarization maintaining Er-doped, figure 9 fiber laser both experimentally and numerically. A 132 fs Ultrashort Pulse with spectral width of 46 nm was achieved around zero dispersion region.
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Ultrashort Pulse fiber lasers and their applications
Japanese Journal of Applied Physics, 2014Co-Authors: Norihiko NishizawaAbstract:Fiber lasers, which consist of ideal waveguides of optical fibers, work as stable, practical, and maintenance-free lasers. A passively mode-locked Ultrashort Pulse fiber laser using the intensity-dependent absorption element has made great progress using a new type of saturable absorber with a nanocarbon material. The techniques of Ultrashort Pulse amplification and Pulse compression were also developed. Using a combination of specialty fibers, ultrawideband Pulse sources, such as wavelength tunable Ultrashort Pulses and supercontinuum, can be demonstrated. These new light sources are useful for laser applications, especially for optical metrology. In this paper, the progress of highly functional Ultrashort Pulse fiber laser sources and their applications are reviewed mainly on the basis of the works of this author.
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Generation of high-quality supercontinuum using Ultrashort Pulse fiber laser system with carbon nanotube
2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR), 2013Co-Authors: A. Okamura, Y. Sakakibara, E. Omoda, H. Kataura, Norihiko NishizawaAbstract:Widely broadened high-quality supercontinuum is generated using high power soliton from Ultrashort Pulse fiber laser system with carbon nanotube. Temporal distribution of generated SC was directly observed using cross-correlated frequency resolved optical gating technique.
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Octave spanning coherent supercontinuum generation by 51 fs pedestal free high power Ultrashort Pulse from similariton amplifier
2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR), 2013Co-Authors: Yuto Nozaki, Norihiko NishizawaAbstract:51 fs, 4.4 nJ pedestal free high power Ultrashort Pulse was generated using Er-doped similariton amplifier. An octave spanning coherent supercontinuum broadened from 1.05 to 2.1 um was generated in highly nonlinear normal dispersive fiber.
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Development and Application of Highly Functional Ultrashort Pulse Fiber Lasers
Nonlinear Optics, 2011Co-Authors: Norihiko NishizawaAbstract:We have demonstrated generation of wideband, ultrafast wavelength tunable Ultrashort Pulses and high quality super continuum based on Ultrashort Pulse fiber lasers. Their applications for ultrahigh resolution optical coherence tomography and NIR spectroscopy are described.
Timur T. Gazizov - One of the best experts on this subject based on the ideXlab platform.
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The Detection of Voltage Extreme Points of the Shielded Power Supply Bus under the Ultrashort Pulse Excitation
2020 21st International Conference of Young Specialists on Micro Nanotechnologies and Electron Devices (EDM), 2020Co-Authors: Rustam R. Gazizov, Ruslan R. Gazizov, Timur T. GazizovAbstract:The paper investigates the propagation of the Ultrashort Pulse along the conductors of the power supply (PS) bus with improved design. The common-mode and differential-mode excitations of the 100 V Ultrashort Pulse were used. Eight propagation ways were considered. The voltage maximum of 13.569 V was obtained with a common-mode excitation, and the voltage minimum (minus 16.683 V) was obtained with differential-mode excitation for 50 Ohm terminations.
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Use of evolution strategy in identifying the worst case effects of Ultrashort Pulse propagation in PCB bus of spacecraft autonomous navigation system
2018 Moscow Workshop on Electronic and Networking Technologies (MWENT), 2018Co-Authors: Ruslan R. Gazizov, Rustam R. Gazizov, Timur T. GazizovAbstract:The paper highlights the importance of using evolution strategy (ES) in investigating Ultrashort Pulse peak voltages in multiconductor structures of printed circuit boards (PCB). Trapezoidal Ultrashort Pulse propagation along the conductors of a real PCB multiconductor bus was simulated and, with ES, the whole Ultrashort Pulse duration was optimized using the criterion of peak voltage maximization in the PCB bus in order to identify the worst-case effects. The ES optimization was launched 10 times with different initial solutions (IS) - 3 ns, 300 ps, 30 ps. It is shown that changing the IS does not influence the optimization results. The voltage maximum exceeding the signal amplitude at the input by 20% and the crosstalk maximum exceeding that of the steady state level in the active conductor by 14% are detected and localized.
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Influence of Ultrashort Pulse duration on localization of crosstalk peak values in PCB of spacecraft autonomous navigation system
2017 International Siberian Conference on Control and Communications (SIBCON), 2017Co-Authors: Ruslan R. Gazizov, Anton O. Belousov, Timur T. GazizovAbstract:Importance of research on specific aspects of Ultrashort Pulse propagation and voltage peak values localization along printed circuit board (PCB) multiconductor bus is highlighted. Simulation of a trapezoidal Ultrashort Pulse propagating along the conductors of the spacecraft autonomous navigation system bus with a different number of excited conductors and a variation of the whole Ultrashort Pulse duration (3; 0.3; 0.03 ns) has been carried out. In the case of 2 excited conductors, the crosstalk maximum value is 29% of steady state level of 0.5 V and the greatest (by modulus) minimum value is 33.4% of 0.5 V. In the case of 4 excited conductors, the maximum values are located in the nodes but the greatest minimum value is 39.8% of 0.5 V. It is shown that significant signal excess is observed with decreasing of Ultrashort Pulse duration both for maximum and minimum, but they appear in one transmission line section of the PCB bus.
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Optimization of Ultrashort Pulse duration with usage of genetic algorithms by criteria of peak voltage maximization in PCB bus
2017 Siberian Symposium on Data Science and Engineering (SSDSE), 2017Co-Authors: Ruslan R. Gazizov, Timur T. Gazizov, Anton O. BelousovAbstract:Importance of the genetic algorithms (GA) usage in the investigation of an Ultrashort Pulse peak voltage in multiconductor structures of printed circuit boards (PCB) is highlighted. Trapezoidal Ultrashort Pulse propagation along the conductors of a real PCB multiconductor bus was simulated. Using GA an optimization of the whole Ultrashort Pulse duration and separately of the rise, top and fall durations was made by a criterion of the peak voltage maximization in the PCB bus. A voltage maximum which is revealed with the whole Ultrashort Pulse duration variation by 16% exceeds the steady state level when the whole duration is near 0.13 ns. A voltage maximum exceeding the steady state level by 36% is revealed and localized by using the variation of Ultrashort rise, top and fall durations. The maximum crosstalk value of 24% of the steady state level is observed for this case. For the last voltage and crosstalk maximums, the whole Ultrashort Pulse duration is near 1 ns. A good replicability of results is shown.
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Influence of Ultrashort Pulse duration on its peak values localization in PCB of spacecraft autonomous navigation system
2017 18th International Conference of Young Specialists on Micro Nanotechnologies and Electron Devices (EDM), 2017Co-Authors: Ruslan R. Gazizov, Alexander M. Zabolotsky, Timur T. Gazizov, Anton O. BelousovAbstract:Importance of research on specific aspects of Ultrashort Pulse propagation and voltage peak values localization along printed circuit board (PCB) multiconductor bus is highlighted. Simulation of a trapezoidal Ultrashort Pulse propagating along conductors of the bus with a different number of excited conductors, fixed variation of the whole Ultrashort Pulse duration (3; 0.3; 0.03 ns) and a duration optimized by genetic algorithms has been carried out. In the case of one excited conductor, the maximum value exceeds by 18% the Ultrashort Pulse amplitude at the input and the greatest (by modulus) minimum value is -36% of 0.5 V level lower the level of zero. In the case of two conductors, the highest maximum value exceeds by 20% the Ultrashort Pulse amplitude at the input and the minimum is -40% of 0.5 V level lower the level of zero. It is shown that significant signal excess is observed with decreasing of Ultrashort Pulse duration both for maximum and minimum. Also, localization of voltage peak values is inconstant: they appear in different parts of PCB bus including different PCB layers. With the usage of optimization, a voltage maximum in the given conductor exceeds the 0.5 V level by 16%, when the whole duration of an Ultrashort Pulse is near 0.13 ns.
Kazuyuki Hirao - One of the best experts on this subject based on the ideXlab platform.
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Ultrashort Pulse laser calligraphy
Applied Physics Letters, 2008Co-Authors: Weijia Yang, P G Kazansky, Yasuhiko Shimotsuma, Masaaki Sakakura, Kiyotaka Miura, Kazuyuki HiraoAbstract:Control of structural modifications inside silica glass by changing the front tilt of an Ultrashort Pulse is demonstrated, achieving a calligraphic style of laser writing. The phenomena of anisotropic bubble formation at the boundary of an irradiated region and modification transition from microscopic bubbles formation to self-assembled form birefringence are observed, and the physical mechanisms are discussed. The results provide the comprehensive evidence that the light beam with centrosymmetric intensity distribution can produce noncentrosymmetric material modifications.
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photowritten optical waveguides in various glasses with Ultrashort Pulse laser
Applied Physics Letters, 1997Co-Authors: Kiyotaka Miura, Hideyuki Inouye, Tsuneo Mitsuyu, Kazuyuki HiraoAbstract:We show that permanent optical waveguides can be formed in various bulk glasses by photoinduced refractive index change with an Ultrashort Pulse laser. The waveguides were fabricated by focusing the laser beam through an microscope objective and translating the sample parallel to the axis of the laser beam. From the observations of intensity distributions in the output of guided light by a CCD camera, we demonstrated that permanent optical waveguides can be successfully formed in various glasses. In addition, from the analysis of a near-field pattern, it was confirmed that single mode waveguides of the graded index type can be formed by a writing technique using the Ultrashort Pulse laser.
Rick Trebino - One of the best experts on this subject based on the ideXlab platform.
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Simple single-shot technique for measuring the complete spatiotemporal intensity and phase of a complex Ultrashort Pulse
2014 Conference on Lasers and Electro-Optics (CLEO) - Laser Science to Photonic Applications, 2014Co-Authors: Zhe Guang, Michelle Rhodes, Rick TrebinoAbstract:Our simple device measures the complete spatiotemporal field of an arbitrary Ultrashort Pulse complex in both space and time (x, y, t). We also demonstrate a method for displaying the resulting dual plots of complex four-dimensional data.
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Everything You've Always Wanted to Know About an Ultrashort Pulse But Thought Was Immeasurable
LEOS 2007 - IEEE Lasers and Electro-Optics Society Annual Meeting Conference Proceedings, 2007Co-Authors: Rick Trebino, Pablo Gabolde, Pamela Bowlan, Selcuk AkturkAbstract:We present two techniques for measuring the complete spatio-temporal intensity and phase, E(x,y,z, t), of an Ultrashort Pulse, one in and near a focus and the other for a single Pulse.
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Extremely simple Ultrashort-Pulse compressor
Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference CLEO QELS 2006, 2006Co-Authors: Selcuk Akturk, Gu Xun, Rick TrebinoAbstract:We have designed and demonstrated a very simple and compact Ultrashort-Pulse compressor using a single prism and a corner-cube. Our design is significantly easier to align and tune compared with previous designs. Angle-tuning the prism wavelength-tunes, and translating the corner cube varies the group-delay dispersion over a wide range. When tuned, the device automatically maintains zero angular dispersion, zero Pulse-front tilt, zero spatial chirp, and unity magnification. The device can easily be built so that its output beam remains collinear with the input beam, and when the input beam or Pulse compressor moves, the input and output beams remain collinear.
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Extremely simple single-prism Ultrashort- Pulse compressor
Optics Express, 2006Co-Authors: Selcuk Akturk, Xun Gu, Mark Kimmel, Rick TrebinoAbstract:We have designed and demonstrated a very simple and compact Ultrashort-Pulse compressor using a single prism and a corner-cube. Our design is significantly easier to align and tune compared with previous designs. Angle-tuning the prism wavelength-tunes, and translating the corner cube varies the group-delay dispersion over a wide range. When tuned, the device automatically maintains zero angular dispersion, zero Pulse-front tilt, zero spatial chirp, and unity magnification. The device can easily be built so that its output beam remains collinear with the input beam, and when the input beam or Pulse compressor moves, the input and output beams remain collinear.
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highly simplified device for Ultrashort Pulse measurement
Optics Letters, 2001Co-Authors: Patrick Oshea, Xun Gu, Mark Kimmel, Rick TrebinoAbstract:We show that a frequency-resolved optical gating device using (1) a thick nonlinear crystal to replace the usual thin crystal and spectrometer and (2) a Fresnel biprism to replace the beam splitter and delay line yields a remarkably simple single-shot Ultrashort-Pulse intensity-and-phase measurement device with no sensitive alignment parameters and significantly greater sensitivity.
Luís E.e. De Araujo - One of the best experts on this subject based on the ideXlab platform.
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Ultrashort-Pulse-train pump and dump excitation of a diatomic molecule
Physical Review A - Atomic Molecular and Optical Physics, 2010Co-Authors: Luís E.e. De AraujoAbstract:An excitation scheme is proposed for transferring population between ground-vibrational levels of a molecule. The transfer is accomplished by pumping and dumping population with a pair of coherent Ultrashort-Pulse trains via a stationary state. By mismatching the teeth of the frequency combs associated with the Pulse trains to the vibrational levels, high selectivity in the excitation, along with high transfer efficiency, is predicted. The pump-dump scheme does not suffer from spontaneous emission losses, it is insensitive to the pump-dump-train delay, and it requires only basic Pulse shaping.
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Ultrashort Pulse propagation in multilevel systems
Physical Review A, 2005Co-Authors: Luís E.e. De AraujoAbstract:Here, I discuss the propagation of an Ultrashort Pulse through a collection of harmonic multilevel systems. In the limit of weak excitation and a large number of excited states, I show that the amplitude of the input driving Pulse decays exponentially with propagation distance. The absorption coefficient associated with this decay is determined by the characteristic time of the manifold of excited states, instead of the polarization decay time as in the conventional absorption coefficient of a two-level atom. The input Ultrashort Pulse creates in the excited states a wave packet, which oscillates emitting secondary Pulses in the process. Analytic solutions are obtained that describe the propagation of individual wave-packet re-emission Pulses, and it is shown that their phase depends on the detuning of the input Pulse.
