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This invention provides a boric acid crystals that is useful to make wavelength conversion optical element and the like, which is made by dissolving water-soluble original material in water to make solution, evaporating water from the solution, either through sintering or not, to make culture material, and then fusing such culture material to make boric acid crystals. As a result, the boric acid crystals can be obtained simply in short time with low cost and further with excellent homogeneity and reliability. Also, this invention provides a laser oscillation apparatus with high reliability by using such crystals as wavelength conversion optical element.
