Feb 1, 2005
Laser Physics Letters
The yield of alpha-particles in nuclear fusion reaction between 11B nuclei and protons in solid mixture induced by oblique p-polarized picosecond laser pulses with high laser contrast is derived analytically. The vacuum (Brunel) heating is the main mechanism for electron heating in overdense plasma. Induced inverse bremsstrahlung can be neglected in the electron heating. Nuclei acquire their kinetic energy due to ambipolar diffusion together with heated electrons at the plasma hydrodynamic expansion with the speed of the ionic sound. The yield of alpha-particles is equal to 4 × 103 for Nd:glass laser with the peak laser intensity of 2 × 1018 W/cm2 and the pulse duration of 1.5 ps.