Fabrication of a miniaturized electron lens system and laser micro-machining condition for silicon membrane
For a miniaturized electron beam system application, miniaturized electrostatic electron lenses and their assembly, called a microcolumn, have been fabricated using an active Q-switched 1.06 ?m Nd:YAG pulsed laser beam. The laser micro-machining condition for 20 ?m thick Si membrane has been investigated by varying the pulse width and the effect of power density will be discussed. The geometrical structures of laser micro-machined electron lenses such as diameter, the roundness of the aperture wall and the degree of the thermal distortion are thought to be dependent on the characteristics of the individual laser pulse. A successful alignment of electron lenses using a simple laser diffraction pattern will be reported, also.
laser micro-machining microcolumn electrostatic electron lens active q-switched nd:yag laser