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June 1988

A New Solid-state, Frequency-Doubled Neodymium-YAG Photocoagulation System

Author Affiliations

From The Eye Research Institute of Retina Foundation (Drs Jalkh, Pflibsen, Pomerantzeff, Trempe, and Schepens) and Retina Associates (Drs Jalkh, Trempe, and Schepens), Boston.

Arch Ophthalmol. 1988;106(6):847-849. doi:10.1001/archopht.1988.01060130917052

• We have developed a solid-state laser system that produces a continuous green monochromatic laser beam of 532 nm by doubling the frequency of a neodymium—YAG laser wavelength of 1064 nm with a potassium-titamyl-phosphate crystal. Photocoagulation burns of equal size and intensity were placed in two rabbit eyes with the solid-state laser system and the regular green argon laser system, respectively, using the same slitlamp mode of delivery. Histologic findings of lesion sections revealed no important differences between the two systems. In theory, the longer wavelength of the solid-state laser offers the advantages of less scattering in ocular media, higher absorption by oxyhemoglobin, and less absorption by macular xanthophyll than the 514-nm wavelength of the regular green argon laser. The solid-state laser has impressive technical advantages: it contains no argon-ion gas tube that wears out and is expensive to replace; it is much more power efficient, and thus considerably smaller and compact; it is sturdier and easily movable; it does not require external cooling; it uses a 220-V monophasic alternating current; and it requires little maintenance.

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