Physical Universe
16th Edition
ISBN: 9780077862619
Author: KRAUSKOPF, Konrad B. (konrad Bates), Beiser, Arthur
Publisher: Mcgraw-hill Education,
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Chapter 9, Problem 52E
To determine
The nature of each level in medium needed for laser action to occur.
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Which (if any) of the following are essential for laser action to occur between two energy levels of an atom? (a) There are more atoms in the upper level than in the lower. (b) The upper level is metastable. (c) The lower level is metastable. (d) The lower level is the ground state of the atom. (e) The lasing medium is a gas.
Does a laser material have to have at least three energy levels? If that is the case, why or why not?
Which of the following is not always a property of lasers?(a) All of the photons in laser light have the same phase.(b) All laser photons have nearly identical frequencies.(c) Laser light moves as a beam, spreading out very slowly.(d) Laser light is always brighter than other sources oflight.(e) Lasers depend on an inverted population of atomswhere more atoms occupy a higher energy state thansome lower energy state.
Chapter 9 Solutions
Physical Universe
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