Carbon dioxide laser invented in 1964 12 the co 2 gas laser is still one of the most widely used medical lasers 16 it contains a mixture of helium 60 80 nitrogen 25 and co 2 5 the gas is excited with either an electrical ac or dc discharge or with a radio frequency rf field. Lasers were developed out of einsteins theories but the first work ing device was not produced until 1960 since then they have found applications in many areas of medicine and hold promise for many more this book has been written to provide a basic found ation on lasers what they are how they work and what they can do for the . Lasers in medical science lims has established itself as the leading international journal in the rapidly expanding field of medical and dental applications of lasers and light
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