Intracavity power measurement by Rayleigh scattering
Lloyd W. Hillman, Jerzy Krasinski, John A. Yeazell, and C. R. Stroud, Jr.
Appl. Opt. 22, 3474 (1983).
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Accurate measurement of intracavity laser power is a necessity in the study
of intracavity nonlinear interactions, intracavity saturation spectroscopy,
and intracavity harmonic generation. A method for this measurement is
described which may offer major advantages over the usual methods. The
authors have constructed a simple apparatus to measure the Rayleigh
scattered power and thus determine the intracavity power in a high-Q laser
cavity. The laser beam, whose power is to be measured, passes through a
series of baffles to eliminate all extraneous scattered light. In the
central chamber the scattered light is measured using a photomultiplier.
The apparatus has some highly desirable properties. It works with both
narrowband and broadband beams; it operates over a large range of powers
including high powers which the breakdown of the air is the limiting
factor. Its primary advantage is that it makes the measurement without
introducing additional losses.
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