Time Characteristics Of Radiation Research Articles

Spectral and amplitude–time characteristics of radiation of plasma of a repetitively pulsed discharge initiated by runaway electrons

Spectral and amplitude–time characteristics of radiation of plasma of a repetitively pulsed discharge initiated by runaway electrons were studied experimentally in nitrogen. Intense emission lines of copper atoms, nitrogen atoms, and ions, as well as the first and the second positive systems of nitrogen, NO, and CN, were observed in the regime of repetitively pulsed excitation.

Radiative and photochemical properties of organic compounds excited by high-power XeCl laser radiation

Radiative and photochemical properties of a number of laser dyes excited by focused radiation of a XeCl laser with intensity up to 200 MW cm-2 were studied. A method for measuring the gain of organic molecules under high-power excitation is proposed. The dependence of the dye transmittance for the pump radiation on its intensity was studied. It is shown that changes in energy, spectral, and time characteristics of radiation and the photostability of compounds under high-power excitation are associated with the formation of superluminescence.

Optical characteristics of a transverse discharge in neon at atmospheric pressure

We present the results of investigation into radiation of a pulsed transverse discharge in neon at a pressure of 10–200 kPa. Survey spectra of plasma radiation, time characteristics of radiation, and the effect of small impurities of water vapors and air on the optical characteristics of a neon plasma were studied. We show that at a pressure of residual gases at a level of 10 Pa intense OH*, NO*, and N * 2 bands are observed in radiation of the plasma of a nanosecond transverse discharge in Ne against the background of continuous plasma radiation, and in the spectral region with λ>400 nm radiation was observed on the Hβ 486.1 nm and NeI 585.3 nm lines, and (when P≥100 kPa) on the line at the 3s–3p-transitions of a Ne atom. The radiation intensity of the third continuum of neon increases with pressure and with energy contribution to plasma, with its maximum being located in the VUV spectral region (λ max <200 nm).

Spectral and time characteristics of radiation from a chemical H2–SF6laser initiated by an electron beam

An investigation was made of the spectral and time characteristics of an SF6–H2 laser initiated by a high-power electron beam. The time-integrated emission spectrum of the HF laser was determined by recording a thermal relief on a photographic film. The time characteristics were obtained employing pyroelectric sensors with a high time resolution (less than 5 ns). Lasing was found to occur far from a rotational equilibrium.

Problem of self-mode-locking in a neodymium laser with a long resonator

Measurements were made of the energy, space, and time characteristics of radiation from a laser with a long (273 m) resonator. Stable self-locking of the longitudinal modes was observed in this laser. A mechanism accounting for the self-mode-locking in lasers with long resonators is proposed.

On measurements of the time characteristics of radiation, which are based on multiphonon processes in oppositely traveling light beams

The connection between the time characteristics of laser radiation and the characteristics of the multiphoton luminescence track in the presence of errors in track measurement is discussed. Estimates of the measurement accuracy required to record ultrashort pulses are obtained. The advantages of the scheme using two vessels are considered; these advantages turn out to be more significant as the photon factor increases.