If you need Corian let me know as I work with the material in my shop and might be able to get you some. Send me a a PM and I will send you my e-mail or just e-mail me if that is displayed here.
By the way the reason it sparks is due to the mineral that is used to fill ( add density) to the plastic that is Corian. Let's just say that Corian is NOT microwave safe.
Tweakie, Great! Is is possible you might be able to patent your method of producing lithophanes with a laser? Certainly seems it might qualify for one.
Just a thought. John I paint with a blue light beam.
As far as I am aware there is nothing new or creative about this process and others have probably already been there before me anyways. (Patents are probably best left to the big business’s that need to protect their investment - I am just happy to share any information which, hopefully, will help others to go on and do better things).
This was just a standard JPG image which I cropped to make it rectangular then using the Mach3 Laser / Impact plugin I scaled it to fit the 50mm x 50mm blank. Set the max. laser power to approx. 30% and hit Cycle Start.
By the time I had finished off a can of beer it was done.
Tweakie. Success consists of going from failure to failure without loss of enthusiasm.