NDLI: Study of laser heated propulsion devices. part 1: evaluation of laser devices, fuels and energy coupling mechanisms

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Study of laser heated propulsion devices. part 1: evaluation of laser devices, fuels and energy coupling mechanisms

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hofer, O. C.
Copyright Year	1982
Description	Closed cycle, CW waveform and short wavelength laser devices are desirable characteristics for laser propulsion. The choice of specific wavelengths for hydrogen fuel affects the operational conditions under which a laser supported absorption (LSA) wave is initiated and maintained. The mechanisms of initiating and maintaining LSA waves depend on the wavelength of the laser. Consequently, the shape and size of the hot core plasma is also dependent on wavelength and pressure. Detailed modeling of these mechanisms must be performed before their actual significance can be ascertained. Inverse bremsstrahlung absorption mechanism is the dominant mechanism for coupling energy into the plasma, but other mechanisms which are wavelength dependent can dictate the LSA wave plasma initiation and maintenance conditions. Multiphoton mechanisms become important at visible or shorter wavelengths. These are important mechanisms in creating the initial H2 gas breakdown and supplying the precursor electrons required to sustain the plasma.
File Size	1039283
Page Count	41
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19820025820
Archival Resource Key	ark:/13960/t3dz52t0g
Language	English
Publisher Date	1982-04-01
Access Restriction	Open
Subject Keyword	Lasers And Masers Laser Plasmas Wavelengths Free Electron Lasers Laser Pumping Bremsstrahlung Technology Assessment Laser Propulsion Excimer Lasers Chemical Lasers Spacecraft Propulsion Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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