Centre National De La Recherche Scientifique

Commissariat a L'energie Atomique

Commissariat a L'energie Atomique Center National De La Recherche

Anne-Marie Lejus

Daniel Vivien

Jean-Jacques Aubert

Bruno Viana

Maurice Couchaud

Christophe Wyon

Claude Calvat

Richard Moncorge

Jeanine Thery

Andree Kahn

Laurent Colle

Mixed lanthanide-magnesium aluminates and lasers using monocrystals of these aluminates. These lasers in particular incorporate two flash lamps for longitudinally pumping a monocrystalline rod of a magnetoplumbito-aluminate emitting visible or infrared light, amplified between a mirror, a polarizing prism being used for passing to the outside of the laser the amplified light beam. The aluminate is of formula: (La.sub.1-x Tr.sub.x).sub.1-y-v Mg.sub.1-z-t Al.sub.11-u+y+2Z/3 Cr.sub.u O.sub.19-t-3v/3 in which Tr represents (a) at least one single trivalent substance chosen from among lanthanides, Y.sup.3+, Sc.sup.3+, or (b) at least one pair of lanthanides formed from a divalent element and a trivalent element, while retaining the electrical neutrality by adding aluminum or oxygen deficiencies, or any combination of (a) and (b); x is a number such that 0.ltoreq.x&lt;1; y and v are numbers such that 0.ltoreq.y+v.ltoreq.0.4; z and t are numbers such that 0.ltoreq.z+t&lt;1, provided that when z=t=O, y+v is .noteq.0 for Tr representing a single trivalent lanthanide; u is a number between 0 and 2, provided that when Tr represents Y.sup.3+ or Sc.sup.3+ u is .noteq.0, that when x=0 u is .noteq.0 and that when u=0 x is .noteq.0.

Mixed lanthanide-magnesium aluminates and lasers using monocrystals of

Mixed lathanum-magnesium aluminates, their production process and lasers using these aluminates. These lasers comprise two flash lamps for longitudinally pumping a bar of an aluminate of formula La.sub.1-x Nd.sub.x Mg.sub.Y Al.sub.11 O.sub.18+y, x and y being numbers such that O&lt;x.ltoreq.0.2 and O&lt;y&lt;1, preferably with y ranging from 0.5 to 0.55, emitting in the infrared, mirrors for amplifying the light emitted by the bar and a polarizing prism for passing the amplified light beam outside the laser.

Mixed lanthanum-magnesium aluminates

Mixed lanthanide-magnesium aluminates and lasers using monocrystals of these aluminates. These lasers in particular incorporate two flash lamps for longitudinally pumping a monocrystalline rod of a magnetoplumbite-aluminate emitting visible or infrared light, amplified between a mirror, a polarizing prism being used for passing to the outside of the laser the amplified light beam. The aluminate is of formula:

These lasers in particular have two flashlamps (30, 32) for longitudinally pumping a monocrystalline aluminate bar (28) emitting in the visible and near infrared, two mirrors (38, 40) for amplifying the light emitted by the bath, a polarizer prism (42) used for feeding the amplified light beam to the outside of the laser cavity. The magnetoplumbite-type aluminate has in particular the formula:

Mixed lanthanum-magnesium aluminates and lasers using monocrystals of

A mixed aluminum oxide having the following formula:

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Anne-Marie Lejus