Patent ID: 7804043
Filing Date: 2010-09-28
Classification: B23K

Abstract:
1. A laser machining system for dicing thin and ultra-thin semiconductor wafers having regular or irregular chip patterns using an ultrafast laser pulse from an ultrafast laser oscillator, comprising: an emitter that emits a pulsed laser beam of ultrashort pulse width from the ultrafast laser oscillator without amplification in addition to an amplification provided by the ultrafast laser oscillator; a laser pulse modulator that modulates a laser pulse of the pulsed laser beam, to minimize a cumulative heating effect and to improve a machining quality of the wafers; a beam diameter modulator that varies the diameter of the pulsed laser beam; a scanner that scans the pulsed laser beam across the wafer; and a focuser that focuses the pulsed laser beam onto the wafer, wherein the thin and ultra-thin semiconductor wafers each includes a plurality of areas demarcated by streets, and wherein each of the thin and ultra-thin semiconductor wafers is diced along the streets to convert each of the thin and ultra-thin semiconductor wafers into a plurality of areas corresponding to semiconductor chips.