This led to the first amplification and generation of electromagnetic waves by stimulated emission in early 1954 . they called this device a maser ( microwave amplification by stimulated emission of radiation ) 光来放大媒质的仪器,并于一九五四年成功研制成第一台微波激射放大器,称为maser ( microwaveamplificationbysimulatedemissionofradiation ) 。