D. V. Shiyanov

CuBr-Ne-HBr laser with a high repetition frequency of the lasing pulses at a reduced energy deposition in the discharge

Experimental and computer studies of the CuBr laser with periodic-pulse pumping are performed with and without addition of HBr. The analysis based on the numerical simulation reveals how additions improve the lasing characteristics of this laser at both typical (10 to 20 kHz) and higher (up to 100 kHz) excitation pulse repetition frequencies during the operation with a low energy deposition in the discharge. This allows the lasing pulse repetition frequency to be increased in the experiment to 750 kHz, which does not seem to be a limit as yet.

Atmospheric bistatic communication channels with scattering. Part 1. Methods of study

The paper considers the methods for theoretical and experimental study of bistatic optical communication schemes. A laboratory model of an optoelectronic communication system has been developed for experimental studies. Copper-vapor laser radiation at a wavelength of 510 nm was used as a source of signals. Test demonstration experiments were performed in the real atmosphere through atmospheric channels with a reflecting surface and a dense nonstationary aerosol-molecular structure. For theoretical studies, software means were developed for numerical statistical estimation of the energy and transfer characteristics of the bistatic atmospheric communication channels by the Monte Carlo method.

A bistatic laser monitor

A prototype of a bistatic laser projection system employing copper bromide vapor based active media is presented that allows remote objects and high-speed processes to be monitored online. The proposed scheme employs two active elements: one in the source for lighting the object and another in the image brightness amplifier.

MnBr vapor active medium with a built-in reactor at 100-kHz pulse repetition frequency

Frequency and energy characteristics of a MnBr vapor laser with a built-in reactor, i.e., with gas vapors being produced within a gas discharge tube, and the dependence of the average output power on different parameters are studied in this work. The values of the GDT wall temperature and buffer gas pressure required for obtaining the maximum output power are determined. It is shown that active media of this kind are as good as media with a conventional method of gas vapor production. A pulse repetition frequency of 100 kHz is attained for the first time for a medium on Mn atom transitions. The use of this active medium as a brightness amplifier in active optical systems is described; the amplifying characteristics are analyzed.

The possibility of increasing the efficiency of CuBr lasers in the regime of double pump pulses

The results of studies of CuBr lasers operating in the regime of double pump pulses with a lasing pulse repetition rate of 50 Hz are presented. The potential to raise the laser efficiency by optimizing the parameters of the excitation pulse and matching it to the impedance of plasma of the active medium formed by the dissociation pump pulse is evaluated. It is demonstrated that the laser efficiency may be increased by several times if the excitation pulse parameters are optimized and the coordinated regime of introduction of the excitation pulse energy into the active medium plasma is used. A maximum laser efficiency of 1.2% with respect to the excitation pulse energy with an energy of 0.2 mJ, an average power of 10 mW, and a half-amplitude duration of lasing pulses of 30 ns is obtained at a time delay of 50 µs. The maximum average radiation power is 18.5 mW with an energy of 0.37 mJ and a laser efficiency of 0.7% for a specific energy of the dissociation (excitation) pulse of 26 (1.8) mJ/cm3.

Frequency-energy and amplification characteristics of the CuCl laser with an internal reactor

A new method for the creation of vapor of a working substance in lasers on atomic transitions is presented. The frequency-energy and amplification characteristics of the CuCl laser that is excited by a barrier discharge are studied. Such a method for the excitation allows an increase in the working lifetime of the active element, since the internal electrodes are rapidly destroyed in chlorine atmosphere. The experimental dependences show that such an approach makes it possible to construct lasers with output parameters that are no worse than the parameters of conventional lasers on metal halides and the amplification characteristics are similar to those of the known active elements.

Study of scalability of capacitive excited CuBr lasers

In this work, we study experimentally the output performance of a middle-scale CuBr laser with longitudinal capacitive discharge excitation. Lasing power dependencies on different operating parameters are studied, including the equivalent electrode capacitance value. An average output power of 12 W, the maximum to date, has been attained in the CuBr laser excited by a longitudinal capacitive discharge with ∼0.5% efficiency. This result has been obtained with a total calculated electrode capacitance of 1190 pF on the each side of the gas discharge active region.

A CuBr laser with high efficiency in the double-pumping-pulse mode

The results of examination of characteristics of a CuBr laser operated in the double-pumping-pulse mode with a lasing pulse repetition rate of 50 Hz are presented. The potential to enhance the laser efficiency by choosing the optimum voltages of dissociation and excitation pulses and time delay values is discussed. It is confirmed that a more than twofold increase in the laser efficiency may be achieved through optimization and matched injection of the excitation-pulse energy into the active medium plasma. A laser efficiency as high as 2.6% (with respect to an excitation pulse) with an average power of 16 mW, an energy of 0.32 mJ, a halfamplitude laser pulse duration of 40 ns, and a time delay of 150 μs is demonstrated. The maximum average radiation power is 37 mW with an energy of 0.7 mJ and a laser efficiency of 0.7% at an energy density of 24 (2.7) mJ/cm3 of a dissociation (excitation) pumping pulse.

Europium vapor laser

The results of an experimental study of a gas-discharge Ne–Eu laser are presented. In this work, lasing lines, pulse shapes in the europium atom and ion are identified under the conditions of this experiment. The effects of the buffer gas pressure and pulse repetition rate on the energy characteristics of the laser are ascertained; their optimal values are found. It is shown that the output power is 1 W at the 1759 nm line and 70 mW at the 664.5 nm line for the corresponding transitions under optimal operating conditions.

Iron bromide vapor laser

We have studied the characteristics of a pulsed gas-discharge laser on iron bromide vapor generating radiation with a wavelength of 452.9 nm at a pulse repetition frequency (PRF) of 5–30 kHz. The maximum output power amounted to 10 mW at a PRF within 5–15 kHz for a voltage of 20–25 kV applied to electrodes of the discharge tube. Addition of HBr to the medium produced leveling of the radial profile of emission. Initial weak lasing at a wavelength of 868.9 nm was observed for the first time, which ceased with buildup of the main 452.9-nm line.