| 摘要 |
<p>The invention relates to an apparatus for external modulation of high-efficiency CO2 laser beams of defined wavelength, particularly for use in CO2 laser material working apparatuses. According to the invention two plates made of transparent material are arranged parallel to each other, the inner surfaces of the plates are reflective and the outer surfaces are non-reflective. The two plates are mounted so that one of the plates is rigidly connected to a massive oscillation-resistant base which comprises a strong permanent magnet, and that the other plate, together with a special hollow cylinder, is fastened on an elastic membrane, so that an oscillatable system is formed which, on the one hand, is driven by the electro-magnetic interaction between the permanent magnet and a coil and that the system, on the other hand, is damped by means of the frictional force of a suitable damping medium of high viscosity located in a gap between the stationary and the oscillating subsystems, so that a reproducable adjustment of the setting of the gap's width between the two plates is possible via the control current of the coil.</p> |
