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Special Issue "Laser Materials"

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A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (31 December 2011)

Special Issue Editors

Guest Editor
Prof. Dr. John Gerard McInerney (Website)

Department of Physics/Tyndall Institute, National University of Ireland, Cork, Ireland
Phone: +353 21 4902468
Fax: +353 21 4276949
Guest Editor
Prof. Dr. Alexander Biriukov

Fiber Optics Research Center of Russian Academy of Sciences 119333, Vavilov Street 38, Moscow, Russia
Interests: physical and chemical kinetics; plasmachemistry; quantum electronics end powerful gas lasers; fiber optics; optical spectroscopy; materials for lasers

Special Issue Information

Dear Colleagues,

The laser is 50 years old this year, and has been transformed from short-lived laboratory curiosity to indispensable part of a many branches of science, technology, manufacturing and medicine. While some of these dramatic advances in functionality and reliability have resulted from better design and new scientific understanding, most benefits have occurred due to improvements in laser materials, so it is appropriate in this special issue to review past developments and anticipate new ones.

Laser materials are those materials which are capable of amplification and generation (in the presence of a resonator) of coherent electromagnetic radiation under external pumping above a reasonable threshold. As a rule, these are gaseous or condensed media containing a sufficient density of active species which can generate gain by virtue of their energy level structure. The active species in laser materials may be neutral atoms, molecules, ions or charge carriers in semiconductors. Depending on the physical properties of the material, it is typically pumped by absorbing electromagnetic radiation at certain wavelengths – those which are absorbed efficiently by the material and for which the resultant excitation can be transferred rapidly and efficiently to the active species to produce population inversion. In other cases, the material may be pumped by electric discharge such as a plasma glow, and there are several other methods.

One especially interesting method is by forward biasing a PN junction in a semiconductor diode. This process generates electrons and holes in the vicinity of the junction, which then recombine to produce photons near the energy gap. With sufficient pumping (ie forward current) the probability of stimulated emission increases to the point where gain is produced and laser oscillation occurs. This is very important because it enables compact, rugged and efficient laser diodes to be mass produced which are highly suitable for optical communication and data storage, for example. At first these lasers required enormous current densities and lasted only minutes at cryogenic temperatures. Now they are so reliable and efficient that they are placed in the most inaccessible places, at the bottom of oceans, where they operate consistently for decades.

For this special issue, we invite papers dealing with recent results and novel trends across a broad range of laser materials, from gas and excimer lasers to solid state, fiber and semiconductor based systems. Means of producing, characterizing, forming and exciting novel laser materials are welcome topics, as are metamaterials and nanostructured media with highly novel properties. We welcome new semiconductors which extend the emission ranges of laser diodes to mid-visible (especially yellow-orange) and ultraviolet, and into the mid to far infrared. Finally, we are interested in highly speculative work on potential materials for emission at terahertz and X-ray wavelengths.

Prof. Dr. John Gerard McInerney
Prof. Dr. Alexander Biriukov
Guest Editors

Keywords

  • active laser component
  • energy level
  • inversion population
  • optical pumping
  • electric discharge pumping
  • relaxation process
  • radiative transition
  • materials used in lasers or superluminescent systems (gain or cavity media, gases, dielectrics, semiconductors, nanostructures and clusters, microcavities, quantum confined media, active metamaterials, special considerations for pulsed or data modulated systems, THz UV and X-ray lasing)

Published Papers (1 paper)

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Review

Open AccessReview Ceramic Laser Materials
Materials 2012, 5(2), 258-277; doi:10.3390/ma5020258
Received: 26 December 2011 / Accepted: 1 February 2012 / Published: 9 February 2012
Cited by 40 | PDF Full-text (3948 KB) | HTML Full-text | XML Full-text
Abstract
Ceramic laser materials have come a long way since the first demonstration of lasing in 1964. Improvements in powder synthesis and ceramic sintering as well as novel ideas have led to notable achievements. These include the first Nd:yttrium aluminum garnet (YAG) ceramic [...] Read more.
Ceramic laser materials have come a long way since the first demonstration of lasing in 1964. Improvements in powder synthesis and ceramic sintering as well as novel ideas have led to notable achievements. These include the first Nd:yttrium aluminum garnet (YAG) ceramic laser in 1995, breaking the 1 KW mark in 2002 and then the remarkable demonstration of more than 100 KW output power from a YAG ceramic laser system in 2009. Additional developments have included highly doped microchip lasers, ultrashort pulse lasers, novel materials such as sesquioxides, fluoride ceramic lasers, selenide ceramic lasers in the 2 to 3 μm region, composite ceramic lasers for better thermal management, and single crystal lasers derived from polycrystalline ceramics. This paper highlights some of these notable achievements. Full article
(This article belongs to the Special Issue Laser Materials)

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