Red, green, blue upconversion laser pumped by single wavelength

Details Red, green, blue upconversion laser pumped by single wavelength Red, green, blue upconversion laser pumped by single wavelength

1990-05-01

1991-04-16

Davie, James W.

Coherent light generators

Particular active media

Insulating crystal

372 70, 372 71, H01S 316

Patent

active

050088904

ABSTRACT:
A full color upconversion laser pumped by a single wavelength infrared laser source is disclosed. The pump energy excites a rare earth doped crystal and can simultaneously lead to laser emission at several wavelengths. The laser includes a crystal of YLiF.sub.4 :Er 5% fabricated in a monolithic structure which incorporates the laser mirrors as dielectric coatings on spherical surfaces of the crysal rod; the mirrors are optically reflecting at one or more of the desired output wavelengths. The laser rod is mounted in a helium cryostat that permits the operating temperature to be varied between 15.degree. and 120.degree. K. The pump energy is supplied through one of the mirrors specifically designed to be simultaneously highly reflecting at the laser wavelength and highly transmitting at the pump wavelength. To achieve optimum efficiency a lens is used in the pump path to focus the pump beam in such a manner as to provide a match of the laser mode size and pumped region of the crystal.

REFERENCES:
patent: 4782494 (1988-11-01), Pollack et al.
patent: 4949348 (1990-08-01), Nguyen et al.
S. A. Pollack and D. B. Chang, "Ion-Pair Upconversion Laser Emission of Er.sup.3+ Ions in YAG, YLiF.sub.4, SrF.sub.2 and CaF.sub.2 Crystals", J. Appl. Phys. 64 2885 (1988).
A. J. Silversmith, W. Lenth, and R. M. Macfarlane, "An Infrared Pumped Erbium Upconversion Laser", Appl. Phys. Lett. 51 1977 (1987).
R. A. McFarlane, "Dual Wavelength Visible Upconversion Laser", Appl. Phys. Lett. 54 2301 (1989).
R. M. Macfarlane, F. Tong, A. J. Silversmith and W. Lenth.: "Violet CW Neodymium Upconversion Laser", Appl. Phys. Lett. 52 1300 (1989).
D. C. Nguyen, G. E. Faulkner and M. Dullick, "Blue-Green (450 nm) Upconversion Tm.sup.3+ ; YLF Laser", Appl. Optics 28 3553 (1989).
F. Tong, R. M. Macfarlane and W. Lenth, "Laser Emission at 413 and 730 nm in Upconversion-Pumped RLiF.sub.4 :Nd.sup.3+ ", Technical Digest of Conference on Quantum Electronics and Laser Science (Optical Society of America, Washington, D.C. 1989), paper THKK4.

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