Forums › Erbium Lasers › General Erbium Discussion › Hydrokinetics Article
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Robert Gregg DDSSpectatorNice job Ron!
Bob
lagunabbSpectatorRon, would you happen to have the complete paper? if so please fax or email. Thanks.
I can easily buy the conclusion in the abstract since it agrees with my original intuition of what may actually be happening when I first reviewed the technology. There are certainly improtant implications (aside from marketing hype) on the performance of 2970 um vs 2780 um if true.
But I don’t have enough understanding of teeth biology (enamel porosity and is it blood or water in the pores, etc ..) to tell from the abstract what they did. Boutoussov and Cozean had a similar paper out when Premier was on the edge of extinction (around the time of the Biolase vs Premier patent litigation) and this sounds like a rehash of that paper. If the paper is correct, things could really be simplified (why bother with the expense and headaches of a adjustable water and air spray?) with a VWR scientific squeeze bottle … like what Bob showed me at his office with his Nd:YAG. 😉
lagunabbSpectatorOT – laser kinetics for one hell of a ride
Laser Accelerated Plasma For Space Propulsion
Terry Kammash
Nuclear Engineering and Radiological Sciences
The University of Michigan
Ann Arbor, MI 48109Recently conducted experiments at the University of Michigan and elsewhere have shown that ultra short pulse [ultra fast] lasers could accelerate charged particles to relativistic speeds. For example a picosecond laser pulse with only one joule of energy can accelerate an electron to MeV energy in just a few microns distance. This takes place through the high gradient potential that manifests itself in an electric field of a gigavolt per cm which in turn accelerates the electron to a megavolt energy over a distance of 10 microns. Current achievable laser peak power of about 10e15 Watts has been utilized in the study of relativistic non-linear optics in plasmas, and it is expected that laser power values will be reached in the near future that will accelerate protons to energies equal to their rest mass energy. That readily means that when such particles are ejected from a system at 0.866 the speed of light they will produce a specific impulse of 26 million seconds. Current experiments have also demonstrated that a beam of MeV protons containing more than 10e10 particles has been accelerated by an electric field of 10 GeV/cm corresponding to a laser power of about 100 TW. On the basis of these accomplishments it is reasonable to project with little risk that with modest modifications of present day systems including rep rates of 10-1000, accelerating 10e18 protons to 100 MeV energy will be quite achievable. If utilized as a propulsion device such a system will produce about 0.22 Kilonewtons of thrust at a specific impulse of about 13 million seconds. This will require a 15 KJ laser at a femtosecond pulse length which when incorporated in a propulsion system such a vehicle will have a dry mass of about 3.6 mT based on previous laser-fusion propulsion system design. When utilized in a constant thrust,acceleration/deceleration type of mission trajectory it is shown that a round trip to Mars will take about 53 days, and a fly-by mission to the Oort cloud at 10,000 AU about 7.5 years.
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