Advances in the development of higher power continuous wave Nd:YAG laser and the capability to handle higher power in fiber optics have led to greater potential applications. In this work, a continuous wave Nd:YAG laser with a wavelength of 1060 nanometers is used with an optical fiber to heat a ceramic work piece immediately before the cutting tool. Silicon nitride absorbs energy better in the 1060 nanometer Nd:YAG wavelength than the 10600 nanometer carbon dioxide laser wavelength. Such an apparatus has been designed and set up for machining of silicon nitride using ISO P15 and M20 (US C-2) grade carbide tools and tungsten carbide tools. Results indicate that this system is capable of machining silicon nitride with a surface finish equivalent to lapping.

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