Category Archives: Pumping

Rare Gases and their Mixtures

Rare gases are a component part of virtually all gas NPLs. Helium, neon, or argon are used as buffer gases, while lasing is achieved at a number of transitions of Xe, Kr, Ar, and Ne atoms, so the luminescence spectra of rare gases are of the greatest interest. Unfortunately, in the scientific literature one can to find information only about […]

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Calculation Procedure

The neutron flux from the nuclear reactors used in experiments involving NPLs varies noticeably at distances that considerably exceed a laser cell’s transverse dimensions [2—14]. Thus, it can be assumed that fission density distribution in a uranium layer, as well as gas temperature and density distribution at any given point within a cylindrical cell, are essentially only dependent upon the […]

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Possible Uses for Reactor Lasers

The advantages of RLs over other types of laser systems are provided by high specific and absolute power capacities, which are practically unattainable in other types of lasers, a wide range of radiation wavelengths (from the near ultraviolet region to the infrared), the absence of intermediate steps in energy conversion, and flexibility of control. The consequences of this are a […]

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Laser Media Based on Cd and Zn Vapors

The largest number of studies were dedicated to analysis of the lasing mechanisms and calculations of the characteristics of NPLs using a He-Cd mixture radiating at transitions of the Cd+ion (A = 441.6, 533.7, and 537.8 nm) [4,106—112]. A diagram of levels of the Cd ion and atom with laser transitions is shown in Fig. 3.5 (see Chap. 3, Sect. […]

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Specific Features of NPLs with a Flowing Gas Medium

Investigations of optical inhomogeneities in sealed NPLs have revealed that flowing of the gas medium through the laser cavity is a necessary condition for achieving CW lasing in the stationary and quasi-stationary excitation modes. Gas heating is a no less important factor that requires the implementation of gas flowing. So, for example, at a thermal neutron flux density of Ф […]

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General Issues

1.1 Chronology of Main Events. Initial Phases of Research This section briefly examines the last 50 years of research in the field of transfor­mation of the kinetic energy of products of nuclear reactions into laser radiation, that is, nuclear-pumped lasers (NPL). NPLs include lasers in the optical spectral range, which are excited directly by nuclear radiation or by using intermediate […]

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Lasers Excited by Fast Neutrons

NPLs excited by products of nuclear reactions occurring at the interaction of the nuclei of several isotopes with thermal neutrons were considered earlier in this chapter. There is yet another method of pumping, using fast neutrons. It was proposed at VNIIEF and was used to excite NPLs operating on transitions of the Xe atom [181]. This method is based on […]

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