Glass-to-glass joining method using laser, vacuum envelope manufactured by the method

A glass-to-glass joining process useful for manufacturing vacuum envelope is provided to accomplish the joining process without alternative adhesive and to reduce production cost caused by use of the adhesive and complex processes by arranging glass subjects to be faced one another and irradiating laser beam to the glass subjects in a direction vertical to interface of the subjects. The process includes the steps of: arranging subjects(2,4) to be faced one another; and irradiating laser beam(6) to either of the subjects in a direction perpendicular to interface of the subject from one of the subjects to form a fused and adhered part around the interface, so that the subjects are combined and adhered together. The irradiation of laser beam is sequential and multiple irradiations of laser beams having different energies. Particularly, the irradiation of laser beam includes irradiation of first laser beam with higher energy and irradiation of second laser beam with lower energy relative to the first laser beam.