Abstract
We developed a sensitive and simple technique to investigate nonlinear absorption and refraction. Previous attempts at these measurements encountered various complications (such as free carrier and defect absorption, optical damage occurring before nonlinear processes can be observed, and dynamic Franz-Keldysh effect) resulting from the use of intensities that were too high hut that were necessitated by the nonlinear process being a smaller effect than these other complicating processes. Consequently, there is a disconcertingly large scatter in previous measurements of nonlinear absorption. This new technique provides significantly more accurate results. It involves the use of an antiresonant ring (a Sagnac interferometer).1 The outstanding advantage of the antiresonant ring is its ability to detect very small changes in a laser beam, which permits the use of much lower intensities and thus circumvents the many complications that have plagued past studies.
© 1992 Optical Society of America
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