@article{oai:nagoya.repo.nii.ac.jp:00030762,
 author = {Fujiwara, Toshi and Nishiwaki, Takashi},
 issue = {1},
 journal = {Memoirs of the Faculty of Engineering, Nagoya University},
 month = {Oct},
 note = {Basically laser propulsion can be achieved either by LSC (Laser Supported Combustion Wave) or by LSD (Laser Supported Detonation Wave) as a mechanism for a propellant gas to absorb laser radiation. Although LSC has been studied by Keefer, Kemp and others [2, 3, 5,] since laser propulsion was proposed in the beginning of 1970's, virtually no analyses on LSD have been attempted since Raizer [1] gave a full description of laser nuclear fusion where he presented several attempts to analyze and found out possible mechanisms on laser absorption by strongly heated gas. In the present analysis the structure of a LSD is shown by solving one-dimensional gasdynamic equations taking account of inverse bremsstrahlung absorption of laser energy incident on the front shock wave. The structure of the detonation consists of (i) a shock wave heating the low-temperature non-absorbing propellant gas up to a very high temperature enabling it to absorb laser radiation, (ii) followed by a thick absorption region where the subsonic flow is accelerated by exothermicity to the sonic velocity. Virtually all the laser energy is utilized to raize the temperature of this region until an equilibrium state is established between the radiation at incident laser wavelength and the bremsstrahlung radiation emission from the heated gas. The Chapman-Jouguet condition is imposed to determine the propagation velocity of the detonation as an eigen value for a given laser intensity; radiation equilibrium is achieved at the sonic state. In practice, the calculation is performed in a manner that an eigen-value laser intensity is searched for a given detonation velocity to satisfy the C-J condition. Out of four conservation equations, the energy and radiative transfer relations contain radiation terms in differential forms which are integrated using the RK method. The results show that the thickness of a detonation wave is several mm through several microns and the propagation velocity D[S] satisfies a relation given by Raizer (Ref. 1) ; D[S]= [2(γ[2]－1)I[0]/[ρ][0]][1/3], which gives the propagation velocity of the order of 50 km/sec for the laser intensity I[0][≅]10[8] w/cm[2]. A multi-dimensional laser detonation using the spherical coordinate is partly analyzed as well.},
 pages = {163--179},
 title = {A strong shock wave supported by the absorption of laser},
 volume = {39},
 year = {1987}
}