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  1. Hey ! I have a doubt in LASER
    In ruby laser . Why chromium is only 0.05% .. means why we take active medium is so less?

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    1. The first ruby laser was 0.05 percent Chromium and during a single pulse of the Xenon flash lamp all the ions were raised to the excited metastable upper laser state. Since the laser medium was ‘saturated’,increased pump power would not have compensated for reductions in length. Shawlow was able to successfully increase the Cr ion dopant concentration by factor of 10 and still obtain laser action. However the pump power photon density must correspondingly be raised to produce a population inversion. Which raises another concern; thermal dissipation capabilities.

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