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.