An optical surface processing method using the cavitation effect
termed as nanoparticle colloid self-induced pulsed cavitation jet polishing (NPCJP)
has been proposed to precisely machine complex optical surfaces with enhanced machining efficiency. The NPCJP system has been developed and simulated by fluid dynamics simulation. The dynamic pressure
static pressure
fluid velocity and cavitation effect of the polishing flow field corresponding to a pulse period of 0.3 s
have been determined. NPCJP jet experiments have been performed and the results show that the NPCJP system can effectively produce self-excited pulsed cavitation jet. NPCJP experiment on a single crystal silicon surface show that supersmooth surface with roughness of
R
a
0.904 nm (
R
ms
1.225 nm) can be obtained. The roughness of the surface obtained using the proposed method is equal to that obtained using the conventional nanoparticle colloid jet polishing method
but the processing efficiency of the NPCJP jet polishing method is higher by about 20%. The results show that the NPCJP method can effectively machine complex optical surfaces.
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Keywords
references
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