Industrial sealed-off copper vapor lasers with improved efficiency and radiation power

Results of experiments aimed at improving the efficiency and radiation power of industrial repetitively pulsed copper vapor lasers are presented. Design and technological improvements are described which increase the efficiency of a laser oscillator up to 1–1.2% relative to the input power drawn from a rectifier and up to 1.4–1.6% relative to the power fed into an active element. The possibility of improving efficiency up to 1.8 and 2.9% respectively is demonstrated. For a laser amplifier, the efficiency is 1.2–1.3 times higher than for an oscillator. For a laser oscillator and a laser amplifier, the power drawn from the active element is 37 and 44 W respectively for a working volume of 250 cm³, 44 and 60 W for a volume of 350 cm³, and 55 and 70 W for a volume of 900 cm³.     

Kinetics of Reaction between Magnesium Hydroxide and Dimethyl Phosphite

The kinetic of the reaction between magnesium hydroxide and dimethyl phosphite in nitrobenzene was studied.     

Role of the Density of Lower Laser Levels in the Control of Generation Parameters of a Copper Vapor Laser

The possibility of controlling the generation parameters of a copper vapor laser (CVL) by varying the density of metastable states of Cu atoms both during pulsed excitation and within interpulse periods is considered. It is shown that control of the CVL generation parameters could be carried out without disruption of laser thermal conditions, and the regime of varying the generation parameters is independent of the means of excitation of the active medium.     

Prospects for Further Development of Self-Heated Lasers on the Self-Contained Transitions of a Copper Atom

An analysis of the causes restricting the frequency–energy characteristics of a copper vapor laser is carried out. The principal cause of the restriction is shown to be the high deexcitation rate of the higher laser levels into the ionized state. This involves a strong increase in the expenditures of energy for the population inversion with a rise in the electron density before the pulse and a high $Q$ factor of the discharge circuit at the end of the exciting pulse. The high Q factor of the discharge circuit is responsible for the oscillatory process of energy dissipation within the time spacing between pulses. This energy is stored in the reactive component of impedance of the discharge tube during the excitation pulse. The oscillatory dissipation defines a slow relaxation of the lower laser levels within the time spacing between the pulses. Analysis of the conditions of population inversion formation in a copper vapor laser shows that the active medium should be pumped in a two-pulse excitation mode to realize the energy potential of the laser of 1–2 kW/liter. The advantages of such an excitation mode over the traditional single-pulse excitation are confirmed.     

Features of Copper Vapor Laser Emission Excited by Pulse-Periodic HF Discharge

The results of numerical studies of pulsed radiation of the induction copper vapor laser are presented. The laser is excited by trains of high-frequency (10–70 MHz) electric current oscillations. Trains follow one after another with a frequency in 2–17 kHz. The features and variety of obtained laser radiation pulse shapes and their applicability to diagnostic purposes and other practical problems are discussed.     

Sealed-off commercial active elements of metal-vapor lasers with output power in the range 1–50 W

Designs and output characteristics of sealed-off active elements (AE) ofCu-andAu-vapor lasers with output power in the range 1–50 W are given. State Scientific-Production Enterprise “Istok”. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 67–73, August, 1999.     

Kinetics of Reaction of Aluminum Hydroxide with Dimethyl Hydrogen Phosphite in Nitrobenzene

The kinetics of the reaction of aluminum hydroxide with dimethyl hydrogen phosphite in nitrobenzene was studied.