Disclosed is a fuel injection valve including a valve body and a bore, embodied as a blind bore, whose bottom face is oriented toward the combustion chamber, and a conical valve seat having at least one injection port is disposed, is embodied on the bottom face. The body frame has a first engaging formation and the cutter has a second engaging formation adjacent and releasably engageable with the first engaging formation for connecting the cutter to the body frame to produce a unitary structure for a cutting operation. The two beams are scanned in synchronism in the direction of the narrow dimension of the line beam to create a narrow heating pulse from the line beam when activated by the larger beam.