For a Nd:YAG laser, there are four pump levels located at 1.53 eV, 1.653 eV, 2.119 eV, and 2.361 eV above the ground state energy level.
a. What is the wavelength associated with the photon energy required to populate each of the pump levels?
b. Knowing that a Nd:YAG laser emits photons of wavelength 1.064 μm, determine the quantum efficiency associated with each of the four pump levels. (The quantum efficiency is the ratio of the energy of a single pump event to that of an output photon.)
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