Once again on the role of UV illumination in non-chain electric-discharge HF(DF) lasers

Journal Article · Sat Feb 28 04:00:00 EST 2004 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2004V034N02ABEH002593· OSTI ID:21470472

Belevtsev, A A ^[1]; Kazantsev, S Yu; Saifulin, A V; Firsov, K N ^[2]

---

1. Institute for High Energy Densities, Associated Institute for High Temperatures, Russian Academy of Sciences, Moscow (Russian Federation)
2. A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)

The influence of UV illumination of a discharge gap on the stability and homogeneity of a volume self-sustained discharge (VSD) in working mixtures (SF{sub 6} with hydrocarbons) of a non-chain HF laser is studied in broad ranges of the discharge-current duration and the energy deposition. It is shown that the UV illumination in lasers with the cathode area S{<=}300 cm{sup 2} and in lasers with the current-pulse duration T{<=}150 ns stabilises the delay time and the voltage amplitude of the electric breakdown of the gap and leads to the levelling (due to photoeffect) of the VSD current density distribution over the cathode surface. The volume preionisation of the working mixture of a non-chain HF laser by UV radiation is impossible because of strong absorption of this radiation by SF{sub 6}. There is no need in UV illumination in wide-aperture, large-volume lasers when small-scale ({approx}50 {mu}m) inhomogeneities are present on the cathode surface. (active media)

• OSTI ID: 21470472
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Journal Name: Quantum Electronics (Woodbury, N.Y.) Journal Issue: 2 Vol. 34; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
APERTURES
CATHODES
CHEMICAL LASERS
CURRENT DENSITY
ELECTRIC DISCHARGES
ELECTRIC POTENTIAL
ELECTRODES
ELECTROMAGNETIC RADIATION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
ILLUMINANCE
INORGANIC ACIDS
INORGANIC COMPOUNDS
LASERS
OPENINGS
PULSES
RADIATIONS
SORPTION
SULFUR COMPOUNDS
SULFUR FLUORIDES
TIME DELAY
ULTRAVIOLET RADIATION