A LASER works only because a state referred to as a population inversion is created, in which the population of the excited state is greater than the population of the ground state. For this reason, which of the following must be present for a functional laser to exist? a) a photon pump to provide stimulating photons; b) an electrical discharge to provide for population of the excited state; c) a metastable excited state; d) a four-level energy state system, where the lifetime in the second lowest excited state is extremely brief; e) a carborundum rod containing Cr(III) species trapped in an Al2O3 matrix
A LASER works only because a state referred to as a population inversion is created, in which the population of the excited state is greater than the population of the ground state. For this reason, which of the following must be present for a functional laser to exist? a) a photon pump to provide stimulating photons; b) an electrical discharge to provide for population of the excited state; c) a metastable excited state; d) a four-level energy state system, where the lifetime in the second lowest excited state is extremely brief; e) a carborundum rod containing Cr(III) species trapped in an Al2O3 matrix
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter29: Atomic Physics
Section: Chapter Questions
Problem 61P
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A LASER works only because a state referred to as a population inversion is created, in which the population of the excited
state is greater than the population of the ground state. For this reason, which of the following must be present for a functional
laser to exist?
a) a photon pump to provide stimulating photons;
b) an electrical discharge to provide for population of the excited state;
c) a metastable excited state;
d) a four-level energy state system, where the lifetime in the second lowest excited state is extremely brief;
e) a carborundum rod containing Cr(III) species trapped in an Al2O3 matrix.
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