Full set of Notes with Fill-Ins - San Jose State University

Chem. 155 Unit 4 Page 101 of 316Laser Questions:Indicate all that apply:1. For a laser gain medium with three or more states, a populationinversion is / means:a. More electrons in the upper than lower states.b. More molecules, atoms or ions in a given excited thanground state.c. Excited state energy is greater than ground state energy.d. Concentration of molecules / atoms or ions in upper stateis greater than concentration in lower state.e. Concentration in ground state is zero.f. Concentration in upper state is greater than half of thetotal.2. For efficient laser gain:a. Upper state should be long-lived.b. Lower state should be short lived.c. Ground state should be unstable.d. Ground state should not be lower state.e. Lower state should be long lived.f. Upper state should be short lived.Contributes to: Proportional To:Phenomenon Gain Loss [upper states] [lower states]SpontaneousemissionAbsorptionStimulatedEmission3. For gain to occur in a laser [upper states] must be _____relative to [lower states]:a. >b.