Patent ID: 8759195

Claim:
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, said optical device layer being partitioned by a plurality of crossing streets to define a plurality of regions where a plurality of 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; an epitaxy substrate dividing step of cutting said epitaxy substrate along predetermined ones of said plurality of crossing streets into a plurality of blocks after performing said transfer substrate bonding step; 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 after performing said epitaxy substrate dividing step, thereby decomposing said buffer layer; and an epitaxy substrate peeling step of peeling off said epitaxy substrate divided into said plurality of blocks from said optical device layer after performing said peeling laser beam applying step.