Transparent Optical Media Research Articles

Amplified reflection, phase conjugation, and oscillation in degenerate four-wave mixing

A number of new optical effects that result from degenerate four-wave mixing in transparent optical media are proposed and analyzed. The applications are relevant to time-reversed (phase-conjugated) propagation as well as to a new mode of parametric oscillation.

Faraday Rotators for High Power Laser Cavities

The large values of Faraday rotation obtained with the use of pulsed high field magnets are shown to be applicable to the control of laser cavities. Experiments are described in which high-field magnets are operated up to 400 kOe in order to introduce large rotations in short, highly transparent optical media. With a ruby laser, interesting pulse enhancement and periodic equispaced output is observed and related to the switching rate of the field, typically 20 kOe/micro sec. Used with a cryptocyanine shutter, it is found that either a single giant pulse or a well-spaced series of pulses can be obtained. These are synchronized with respect to the varying magnetic field with fractional microsecond accuracy.

What Is Amblyopia Exanopsia?

<h3>To the Editor:</h3> —Having devoted considerable attention to the study of cases presenting typical and indisputable illustrations of amblyopia exanopsia, I am disposed to respond to your query (in an editorial) in a recent issue of the Jour nal, Is there an amblyopia exanopsia? and place myself on record as being decidedly of the opinion that many cases of obtundedvision are properly ascribable to non-use of the eye in question, and can not justly be attributed to other causes. In order to induce us to accept such a condition, it seems that it is only requisite for us to revert to the fact that the process of seeing is virtually an educational one at the outset, and that while all of the requisite anatomic arrangements may be present in any given case, which are known to be essential for the visual performance, such as transparent optical media, physiologic accommodation, normal