Overcoming the quantum limit

By applying direct pumping technology, we proved the suppressing of stokes shift from (4F5/2 - 4I9/2) - (4F3/2 - 4I11/2) to (4I11/2 - 4I9/2), the atomic quantum efficiency will improve from 76% to 83%. We proved over 80% of laser efficiency that was considered to be impossible by use of Nd:lasers. In addition, we indicated the very simple method for the pump quantum efficiency, which is considered to be very difficult by means of all-optical experiments.

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