High‐frequency laser sonar system

2002 ◽  
Vol 112 (5) ◽  
pp. 2408-2408
Author(s):  
Benjamin A. Cray ◽  
Ashwin Sarma ◽  
Ivars P. Kirsteins
Keyword(s):  
High Frequency ◽  
Sonar System ◽  
Frequency Laser

Lead Extraction with High-Frequency Laser Sheaths: A Single-Center Experience

2016 ◽  
Vol 64 (S 01) ◽  
Author(s):  
M. Linder ◽  
S. Pecha ◽  
S. Zipfel ◽  
L. Castro ◽  
N. Gosau ◽  
...  
Keyword(s):  
High Frequency ◽  
Lead Extraction ◽  
Single Center ◽  
Single Center Experience ◽  
Frequency Laser

scholarly journals Circular Rydberg states of helium atoms or helium-like ions in a high-frequency laser field

Open Physics ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 11-17
Author(s):  
Nikolay Kryukov ◽  
Eugene Oks
Keyword(s):  
High Frequency ◽  
Laser Field ◽  
Nuclear Charge ◽  
Rydberg States ◽  
Orbital Plane ◽  
Precession Frequency ◽  
Nonmonotonic Dependence ◽  
Absolute Value ◽  
Rydberg Electron ◽  
Frequency Laser

Abstract In the literature, there were studies of Rydberg states of hydrogenic atoms/ions in a high-frequency laser field. It was shown that the motion of the Rydberg electron is analogous to the motion of a satellite around an oblate planet (for a linearly polarized laser field) or around a (fictitious) prolate planet (for a circularly polarized laser field): it exhibits two kinds of precession – one of them is the precession within the orbital plane and another one is the precession of the orbital plane. In this study, we study a helium atom or a helium-like ion with one of the two electrons in a Rydberg state, the system being under a high-frequency laser field. For obtaining analytical results, we use the generalized method of the effective potentials. We find two primary effects of the high-frequency laser field on circular Rydberg states. The first effect is the precession of the orbital plane of the Rydberg electron. We calculate analytically the precession frequency and show that it differs from the case of a hydrogenic atom/ion. In the radiation spectrum, this precession would manifest as satellites separated from the spectral line at the Kepler frequency by multiples of the precession frequency. The second effect is a shift of the energy of the Rydberg electron, also calculated analytically. We find that the absolute value of the shift increases monotonically as the unperturbed binding energy of the Rydberg electron increases. We also find that the shift has a nonmonotonic dependence on the nuclear charge Z: as Z increases, the absolute value of the shift first increases, then reaches a maximum, and then decreases. The nonmonotonic dependence of the laser field-caused energy shift on the nuclear charge is a counterintuitive result.

scholarly journals Smart Ocean: A New Fast Deconvolved Beamforming Algorithm for Multibeam Sonar

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 4013 ◽  
Author(s):  
Jie Huang ◽  
Tian Zhou ◽  
Weidong Du ◽  
Jiajun Shen ◽  
Wanyuan Zhang
Keyword(s):  
High Frequency ◽  
Real Data ◽  
Side Lobe ◽  
Tunnel Effect ◽  
Computation Complexity ◽  
Acoustic Image ◽  
Multibeam Sonar ◽  
Sonar System ◽  
Topographic Survey ◽  
Beamforming Algorithm

A new fast deconvolved beamforming algorithm is proposed in this paper, and it can greatly reduce the computation complexity of the original Richardson–Lucy (R–L algorithm) deconvolution algorithm by utilizing the convolution theorem and the fast Fourier transform technique. This algorithm makes it possible for real-time high-resolution beamforming in a multibeam sonar system. This paper applies the new fast deconvolved beamforming algorithm to a high-frequency multibeam sonar system to obtain a high bearing resolution and low side lobe. In the sounding mode, it restrains the tunnel effect and makes the topographic survey more accurate. In the 2D acoustic image mode, it can obtain clear images, more details, and can better distinguish two close targets. Detailed implementation methods of the fast deconvolved beamforming are given, its computational complexity is analyzed, and its performance is evaluated with simulated and real data.

scholarly journals Pulse duration effect on photoelectron spectrum of atom irradiated by strong high frequency laser

2018 ◽  
Vol 67 (7) ◽  
pp. 073202
Author(s):  
Guo Jing ◽  
Guo Fu-Ming ◽  
Chen Ji-Gen ◽  
Yang Yu-Jun
Keyword(s):  
Pulse Duration ◽  
High Frequency ◽  
Photoelectron Spectrum ◽  
Frequency Laser ◽  
Duration Effect

Effect of the High-Frequency Laser Radiation on the Nonlinear Optical Properties of n-Type Double δ-Doped GaAs Quantum Wells

2019 ◽  
Vol 19 (7) ◽  
pp. 4167-4171
Author(s):  
Fatih Ungan ◽  
Huseyin Sari ◽  
Esin Kasapoglu ◽  
Unal Yesilgul ◽  
Serpil Sakiroglu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Laser Radiation ◽  
Quantum Wells ◽  
High Frequency ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Frequency Laser

Dichotomy of the Hydrogen Atom in Superintense, High-Frequency Laser Fields

1988 ◽  
Vol 61 (8) ◽  
pp. 939-942 ◽  
Author(s):  
M. Pont ◽  
N. R. Walet ◽  
M. Gavrila ◽  
C. W. McCurdy
Keyword(s):  
Hydrogen Atom ◽  
High Frequency ◽  
Laser Fields ◽  
Frequency Laser
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