2. Dummy PCB Glass/Optical Single crystal planar Diamond detector

3. Glass surface (outwards facing) Laser power 128mW Y: 8 Y: 7 Y: 6 Y: 5 Position reference dot: fixed Y: 6

4. PCB surface Laser power 128mW Y: 8 Y: 7 Y: 6 Y: 5 Position reference dot: fixed Y: 6

5. Y: 6.4 Finer testing Y: 6.3Y: 6.2Y: 6.1Y: 6.0Y: 5.9Y: 5.7Y: 5.8Y: 5.6Y: 5.5

6. Diamond PCB

7. Dummy PCB - glass

8. (X: 12.5, Z: 13.0) 2 mm

9. (X: 12.5, Z: 13.0) 2 mm

10. Have determined laser focus position in X, Y and Z with respect to the PCB. Removed glass from dummy PCB and replaced with optical grade diamond. Graphitisation studies at current lowest power (9mW).

11. ref. dot (surface) dot in bulk columnsurface line 22mW – 20um/s 9mW – 20um/s 9mW – 15um/s Optical grade diamond mounted on dummy PCB