Patent ID: 9048349
Filing Date: 2015-06-02
Classification: B23K,H01L,H01S

Abstract:
1. An optical device wafer processing method for transferring an optical device layer in an optical device wafer to a transfer substrate, said optical device layer being formed on the front side of an epitaxy substrate through a buffer layer, and partitioned by a plurality of crossing streets to define a plurality of regions where optical devices are respectively formed, said optical device wafer processing method comprising: a transfer substrate bonding step of bonding said transfer substrate to the front side of said optical device layer formed on the front side of said epitaxy substrate through said buffer layer; a transfer substrate cutting step of cutting said transfer substrate bonded to the front side of said optical device layer together with said optical device layer along said streets, wherein said transfer substrate cutting step results in the formation of a division groove that extends completely through said transfer substrate; a supporting member attaching step of attaching said transfer substrate to a supporting member after performing said transfer substrate cutting step, wherein the supporting member comprises a dicing tape supported by an annular frame; a peeling laser beam applying step of applying a laser beam having a transmission wavelength to said epitaxy substrate from the back side of said epitaxy substrate to a unit of said optical device wafer and said transfer substrate in a condition where the focal point of said laser beam is set in said buffer layer, thereby decomposing said buffer layer; and an epitaxy substrate peeling step of peeling off said epitaxy substrate from said optical device layer after performing said peeling laser beam applying step.