Author: G. J. WolgaPublisher:
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Languages : en
Pages : 93
Book Description
A mode selected, cryptocyanine Q-switched ruby laser was designed, constructed, and operated. The degree of mode selectivity as a function of cryptocyanine loss was studied and an optimum loss was selected. Theoretical work was done to incorporate the cryptocyanine loss into a theory of passively Q-switched lasers. A transient interference experiment was redesigned for operation with a Q-spoiled laser. Data was obtained showing that the rate of change of the laser frequency during the Q-spoiled emission pulse is approximately twenty times the rate of change during a single spike of an ordinary ruby laser. This result tends to confirm a previously stated model for this frequency change which attributes it to direct atomic coupling to lattice strain. The ions are expected to act independently in causing the strain and hence the variation in cavity optical length is expected to be linear in the change in the number of excited states in the laser. Since the rate of change of population inversion during Q-spoiled emission is much larger than for normal lasing it was expected, prior to this work, that a greater rate of change of frequency should be observed. This has now been confirmed. (Author).
Author: United States. National Aeronautics and Space Administration
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