Optical device wafer processing method

An optical device wafer processing method includes a shield tunnel forming step of applying a pulsed laser beam having a transmission wavelength to a sapphire substrate along an area corresponding to each division line from the back side of the sapphire substrate in the condition where the focal poi...

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Bibliographische Detailangaben
Hauptverfasser:	Shotokuji, Takumi, Oba, Ryugo, Kirihara, Naotoshi
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING DEVICES USING STIMULATED EMISSION ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS SEMICONDUCTOR DEVICES SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	An optical device wafer processing method includes a shield tunnel forming step of applying a pulsed laser beam having a transmission wavelength to a sapphire substrate along an area corresponding to each division line from the back side of the sapphire substrate in the condition where the focal point of the pulsed laser beam is set inside the sapphire substrate, thereby forming a plurality of shield tunnels arranged along the area corresponding to each division line, each shield tunnel being composed of a fine hole and an amorphous region formed around the fine hole for shielding the fine hole. The optical device wafer processing method further includes a dividing step of applying an external force to the optical device wafer after performing a light emitting layer forming step, thereby dividing the optical device wafer along the division lines to obtain the individual optical device chips.