Laser Light Propagation and Collisional Absorption

摘要: By absorption of electromagnetic radiation we understand the destruction a certain number photons and creation other forms energy same amount, e.g., plasmons, phonons, accelerated heated particles. In language second quantization operator reads b + (a annihilation operator, operator); occurs when its expectation value is nonzero. We call process collisional or inverse bremsstrahlung if transformation photon due to Coulomb field single particles, in contrast collective collisionless which resonant interaction with fields. There clear distinction between collective: depends on one space variable only whereas needs at least two variables. An example excitation plasmons by plasma ions cold electron fluid oscillating an intense laser their subsequent damping breaking, particle acceleration, Landau mechanism and/or collisions.