Time Structure Of Radiation Research Articles

Space — time structure of radiation from a high-power fast-flow CO2 laser

The space — time structure of radiation from an industrial electric-discharge, flowing CO2 laser is studied experimentally. For the optimal design of the optical and gas-dynamic sections, a total suppression of high-frequency radiation fluctuations and a lowering of the amplitude of low-frequency fluctuations down to 6% — 10% were observed with increasing output power. At the same time, the intensity distribution in the near-field diffraction zone was complicated and unstable. 'Hot' spots and screw wave-front dislocations were observed in the laser-beam cross section. Numerical simulations showed that the properties of the near-field radiation structure are determined by random caustics and phase singularities formed due to the diffraction transformation of the initial wave-front perturbations.

Time structure of radiation from a cw-pumped two-beam YAG:Nd3+laser under conditions of small perturbations

A theoretical analysis is made and experimental data are given on two-beam stimulated emission from a cw-pumped YAG:Nd3+ laser. Cophasal and antiphase oscillations of the radiation intensity in the channels were observed under conditions of small perturbations. Estimates based on rate equations were shown to be valid in an analysis of lasing regimes in a two-beam laser.