Sc.sup.2+ based active crystalline luminescent media for laser

Details Sc.sup.2+ based active crystalline luminescent media for laser Sc.sup.2+ based active crystalline luminescent media for laser

1994-09-16

1995-11-28

Scott, Jr., Leon

Coherent light generators

Particular active media

Insulating crystal

372 39, H01S 316

Patent

active

054714931

ABSTRACT:
Disclosed is the use of Sc.sup.2+ based active crystalline luminescent media for laser systems, tunable in the UV-visible spectral range. The crystalline media are Sc-doped alkali-earth-halide crystals such as: (1) alkali-earth-halide combinations, such as MeF.sub.2, MeCl.sub.2,crystals; (2) mixed alkali-earth metal fluorides and chlorides, such as MeFCl, M.sub.x Me.sub.1-x F.sub.2 and M.sub.x Me.sub.1-x Cl.sub.2 crystals; and (3) complex fluoride crystals; wherein M and Me are Ca, Sr, Ba or Mg. These crystals have Sc.sup.2+ ion impurities providing stable optical centers that yield advantageous luminescent properties. The base crystal structure utilized determines the luminescent emission spectrum for the Sc.sup.2+ optical centers. By manipulating the base crystal, the maxima of the absorption and emission bands may be altered from UV-blue to red in the optical spectrum. The Sc.sup.2+ active crystalline luminescent media are initially doped with trivalent Sc.sup.3+ ions during crystal growth. The crystals are then subjected to subsequent processing, such as ionizing irradiation, additive calcining coloration, or electrolytic coloration, to transform Sc.sup.3+ ion impurities into an Sc.sup.2+ electron configuration.

REFERENCES:
Hochli et al; Parmagnetic Resonance Study of the Dynamic Jahn-Teller Effects in CaF2:Sc+2 and SrF2.Sc+2, "Physical Review Letters", 18(4); pp. 128-130; 1967 (No month).
Fabeni et al., "Impurity Centers for Tunable Lasers in the Ultraviolet and Visible Regions," J. Phys. Chem. Solids, 52(1):299-317, Mar., 1991.
Hochli and Estle, "Paramagnetic-Resonance Study of the Dynamic Jahn-Teller Effect in CaF.sub.2 :SC.sup.2+ and SrF.sub.2 :Sc.sup.2+ ," Physical Review Letters, 18(4):128-130, Jan., 1967.
Hochli, U. T., "Jahn-Teller Effect of d.sup.1 Ion in Eightfold Cubic Coordination," Physical Review, 162(2):262-273, Oct., 1967.
Moulton, P. F., "Spectoscopic and Laser Characteristics of Ti:Al.sub.2 O.sub.3," J. Opt. Soc. Am. B, 3(1):125-134, Jan., 1982.
Moulton, Peter F., "An Investigation of the Co:MgF.sub.2 Laser System," IEEE Journal of Quantum Electronics, QE-21(10):1582-1595, Oct., 1985.
Moulton, Peter, "Ti-doped Sapphire: Tunable Solid-state Laser," Optics News, p. 9, Nov./Dec., 1982.
Schwotzer et al., "Donor-Acceptor Pairs in Ionic Crystals," Izvestiya Akademii Nauk SSSR. Seriya Fizicheskaya, 37(4):810-817, Apr., 1973.

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