You work for a company that makes red helium?neon lasers widely used in physics experiments. Figure 36.19

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You work for a company that makes red helium?neon lasers widely used in physics experiments. Figure 36.19 shows an energy-level diagram for this laser. An electric current excites helium to a metastable level E1 at 20.61 eV above the ground state. Collisions transfer energy to neon atoms, exciting them to E2 = 20.66 eV. The lasing transition drops the atoms to E3, emitting a 632.8-nm photon in the process. You?re asked to find the maximum possible efficiency for this laser?that is, the light energy emitted as a percentage of the energy supplied to excite the atoms.

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Essential University Physics

ISBN: 978-0321976420

3rd Edition Volume 2

Authors: Richard Wolfsonby

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