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Chopping effects on optical machining

Chopping effects on optical machining

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Chopping effects on optical machining

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  1. Chopping effects on optical machining Sanghyun Lee Prof. Alan Hunt Prof. E.F. Hasselbrink

  2. Machining with laser chopping and various feed rate 100Hz 200Hz 400Hz 800Hz Optical machining with IMRA μJewel

  3. Induced ultrasonic effects a. Normal glass b. Custom glass Machining w/o laser chopping and various feed rate - Normal glass substrate: 25x25mm 170um thickness cover slip - Custom glass substrate: normal cover slip with reservoir Optical machining with IMRA μJewel

  4. Machining with laser chopping and various feed rate • Machining performance is affected by the laser chopping and the feed rate. • Generally speaking, laser chopping is advantageous in machining performance and the slow machining can achieve longer channel machining. Optical machining with IMRA μJewel

  5. Machining with laser chopping and various feed rate Machining with different chopping frequencies • The chopping is thought to affect the pressure field resulting in different pressure node formation. So called the group repetition rate (GRR) can be considered to form major pressure field having much lower frequency. Optical machining with IMRA μJewel

  6. Machining with laser chopping and various feed rate Machining with various feed rate • Feed rate (speed of nano stage) is one of the most important factors in machining. Not surprisingly the slow feed rate could machine longer channel in this simple machining pattern. However, in the practical machining using more complex patterns some optimal feed rate should be adopted for better performance. Optical machining with IMRA μJewel