scholarly journals Analysis of Vase Shaped Pumping Cavity for Solar-Pumped Laser

2021 ◽  
Vol 25 (2) ◽  
pp. 242-247
Author(s):  
Hayato Koshiji ◽  
Tomomasa Ohkubo ◽  
Takumi Shimoyama ◽  
Takeru Nagai ◽  
Ei-ichi Matsunaga ◽  
...  
Keyword(s):  
Power Density ◽  
Absorption Rate ◽  
Laser Light ◽  
Laser System ◽  
Absorption Efficiency ◽  
Laser Medium ◽  
Power Density Distribution ◽  
Absorbed Power ◽  
Ray Tracing Simulation ◽  
Absorption Power

Although sunlight is a promising renewable energy source, the light is incoherent and difficult to use directly. Therefore, a solar-pumped laser, which directly converts sunlight into coherent laser light of, is a promising technology. A solar-pumped laser collects sunlight into the laser medium to realize laser oscillation. In order to realize an efficient solar-pumped laser system, it is necessary to design a pumping cavity that absorbs maximal sunlight into the laser medium with minimal thermal shock. In this research, the pumping cavity shape was studied using a numerical ray tracing simulation. As a result, it was found that a cone shaped pumping cavity can be expected to improve the absorption rate by approximately 30% over a cylindrically shaped pumping cavity. Furthermore, the absorption power density distribution can be flattened by a vase shaped pumping cavity, while maintaining the same absorption efficiency. The vase shaped pumping cavity has almost half the dispersion of the absorbed power density in the laser medium when compared with the cone shaped pumping cavity.

Investigation of beam pointing stability, far-field divergence angle and power density distribution of a high-power CO2 laser

1996 ◽  
Author(s):  
Ruediger Maestle ◽  
Wilfried Plass ◽  
J. Chen ◽  
Christian Hembd-Soellner ◽  
Adolf Giesen ◽  
...  
Keyword(s):  
Density Distribution ◽  
Power Density ◽  
High Power ◽  
Divergence Angle ◽  
Far Field ◽  
Power Density Distribution

The influence of changes in the VVER-1000 fuel assembly shape during operation on the power density distribution

2016 ◽  
Vol 79 (8) ◽  
pp. 1298-1304
Author(s):  
L. K. Shishkov ◽  
S. S. Gorodkov ◽  
E. F. Mikailov ◽  
E. A. Sukhino-Homenko ◽  
A. S. Sumarokova
Keyword(s):  
Density Distribution ◽  
Fuel Assembly ◽  
Power Density ◽  
Power Density Distribution

scholarly journals Planar Dual Polarized Metasurface Array for Microwave Energy Harvesting

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1985
Author(s):  
Maged A. Aldhaeebi ◽  
Thamer S. Almoneef
Keyword(s):  
Energy Harvesting ◽  
Dielectric Substrate ◽  
Metamaterial Absorber ◽  
Absorption Efficiency ◽  
Unit Cell ◽  
Resistive Load ◽  
Electromagnetic Energy Harvesting ◽  
Absorbed Power ◽  
Simulation Results ◽  
Dual Polarized

The design of a dual polarized metasurface collector based on the metamaterial full absorption concept for electromagnetic energy harvesting is introduced. Unlike previous metamaterial absorber designs, here the power absorbed is mostly dissipated across a resistive load rather than within the dielectric substrate. This is achieved by channeling the absorbed power to an optimal resistive load through a via hole. The simulation results show that a power absorption efficiency of 98% is achieved at an operating frequency of 2 GHz for a single unit cell. A super unit cell consisting of four cells with alternating vias was also designed to produce a dual polarized metasurface. The simulation results yielded a radiation to AC efficiency of around 98% for each polarization.

scholarly journals Charged particle spectra from U-235 and B-10 micropellets and slab coatings

1984 ◽  
Vol 2 (2) ◽  
pp. 201-211 ◽  
Author(s):  
A. K. Chung ◽  
M. A. Prelas
Keyword(s):  
Charged Particle ◽  
Low Power ◽  
Power Density ◽  
Fission Fragment ◽  
High Efficiency ◽  
Nuclear Reactions ◽  
Length Distribution ◽  
Laser Medium ◽  
Fissile Material ◽  
Particle Spectrum

A novel method of utilizing fluorescence generated from the products of nuclear reactions offers the prospect of compact, high efficiency, multi-megajoule lasers. To overcome the problems associated with traditional laser (or energy converter)-fissile material interfaces, such as a uranium coating (low power density and low efficiency) or a gaseous uranium compound (low power density and deleterious effects on the laser kinetics and photon transport), a method suggested elsewhere of employing a reactor using a uranium aerosol fuel, interspersed with a fluorescer medium, is briefly reviewed. The charged particles produced by nuclear reactions in the fuel produce fluorescence in the core region of the reactor, through interactions with the fluorescer. This fluorescence can then be concentrated, to increase the effective power density in the laser medium, and used to drive a photolytic laser.One key issue in the above process is the charged particle spectrum from the fissile aerosol. These issues can be addressed theoretically based on the Dirac chord length distribution technique and an Arcen's function. The charged particle spectrum from a UO2 coating has been generated and benchmarked with the experimental data of Kahn et al., and Redmond et al. Agreement is generally good except near the end of the fission fragment tracks. The validity of this simple technique in approximating the rate of ion energy loss lends confidence to the generation of fission fragment spectra for other geometries (i.e. spherical in which transport efficiencies of over 60% appear achievable) using U, UO2 and U3O8. Work is also extended to the case of B-10 in a variety of configurations which are frequently used in modern energy conversion experimental devices.

Paper 9: Some Aspects of Laser Safety

1968 ◽  
Vol 183 (4) ◽  
pp. 43-46
Author(s):  
K. D. Harris
Keyword(s):  
Power Density ◽  
Laser Light ◽  
Living Tissue ◽  
Laser Safety ◽  
The Past

Considerable study has been made over the past few years of the conditions under which damage can be sustained by living tissue due to laser light. This has led to limits of power density which should not be exceeded without caution. However, many applications have to be carried on where it is not possible to exclude all possibility of hazard. In such cases it is necessary to assess the probability of the hazard and to decide whether the event is sufficiently improbable to be acceptable or not. This paper deals with some of the factors useful in making this type of assessment.

Applications of Laser Light of Low Power Density. Experimental and Clinical Investigations

2015 ◽  
pp. 111-116 ◽  
Author(s):  
R. Brunner ◽  
D. Haina ◽  
M. Landthaler ◽  
W. Waidelich ◽  
O. Braun-Falco
Keyword(s):  
Low Power ◽  
Power Density ◽  
Laser Light ◽  
Clinical Investigations
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