Abstract
A new regime for silica glass machining for micro-optical fabrication applications, which uses pulsed CO2 laser radiation in the 2.5-100-micros pulse width region that has been generated by an acousto-optic modulator, is investigated. A filamentary melt ejection process that generates fibers and significant melt displacement limits machining quality below 30-micros pulse width. Ablation and melt ejection thresholds are quantified relative to pulse width, and the region from 30 to 50 micros is identified for low-threshold, smooth machining without melt displacement and ejection effects.
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