Optical pumping of a ruby laser is done with photons absorbed at energy 2.25 eV.The laser light consists of photons of energy 1.79 eV in a transition that goes to ground.What is the energy of the transition from the pumped stated to the lasing state?
A) 2.25 eV
B) 1.79 eV
C) 4.04 eV
D) 0.460 eV
E) 1.30 eV

Question

Quizplus · Accepted Answer

The energy of the transition from the pumped state to the lasing state is equal to the difference in energy between the two photons involved. The energy of the absorbed photon is 2.25 eV, and the energy of the emitted photon is 1.79 eV. Therefore, the energy of the transition is 2.25 eV - 1.79 eV = 0.460 eV.

Optical Pumping of a Ruby Laser Is Done with Photons