Laser Hallmarking Machine

Unless alloyed with a very small quantity of some other metal, both Gold and silver are too soft to withstand wear and tear while being adorned. It is very easy to carry out adulteration of an alloy into the precious metal without change in its color or touch and is difficult to detect without technical tests. Therefore hallmarking is the accurate determination and official recording of the proportionate content of precious metal in Gold and silver. Hallmarks are thus official marks used in many countries as a guarantee of the purity of fineness of gold jewelry, Hallmarking laser marker uses a very small beam diameter; even lesser than 30 microns and yet have very high peak power.
The laser has to hallmark on a very highly polished surface. Hence the chances of beam bouncing off are very high. So the hallmarking laser should block the returning beam to avoid damaging its own resonator.
A diode laser has less than 10,000 hours of diode life versus more than 100,000 hours life expectancy of fiber laser giving it an edge over diode lasers. Smaller lifespan of the diode laser beam will result in increase in the cost of ownership and thus adding overhead expenses.
Normally fiber lasers need two passes to etch gold. First one to frost the gold and second to engrave. This makes the marking less sharp. One Clean mark must be preferred for hallmarking gold and silver jewelry.
When buying a Fiber laser for hallmarking it must be kept in mind that it should do the hallmarking in ONE pass only and not TWO passes.