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Semiconductor Diode Laser Pumped Upconversion Laser

IP.com Disclosure Number: IPCOM000041034D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Lenth, W: AUTHOR [+2]

Abstract

An upconversion laser, i.e., one operating at a wavelength shorter than that of the pump, consists of a rare earth laser medium that is longitudinally pumped by coherent infrared diode laser radiation. For most efficient use of the pump light two diode lasers should be used. The wavelengths of these narrow band diode lasers can be accurately tuned to match the spectrally narrow (typically 0.1-0.5nm) absorption transitions that are involved in the stepwise upconversion excitation. In a longi- tudinal pumping arrangement very high pump power densities can be achieved by tight focusing of the diode laser radiation. A dichroic beam splitter is used to extract the laser energy in a direction perpendicular to the laser axis.

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Semiconductor Diode Laser Pumped Upconversion Laser

An upconversion laser, i.e., one operating at a wavelength shorter than that of the pump, consists of a rare earth laser medium that is longitudinally pumped by coherent infrared diode laser radiation. For most efficient use of the pump light two diode lasers should be used. The wavelengths of these narrow band diode lasers can be accurately tuned to match the spectrally narrow (typically
0.1-0.5nm) absorption transitions that are involved in the stepwise upconversion excitation. In a longi- tudinal pumping arrangement very high pump power densities can be achieved by tight focusing of the diode laser radiation. A dichroic beam splitter is used to extract the laser energy in a direction perpendicular to the laser axis.

As alternative pump geometries, polarization coupling of the two pump beams or L-shaped and ring-shaped cavity configurations can be used. By using polarization coupling and an appropriate geometry, the radiation from more than two pump sources can be coupled into the laser rod. Also two or more laser rods can be combined in one resonator to increase the visible output power.

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