Wave generation by compensation of propagation phase-lag in a nonlinear optical medium

摘要

The method involves inducing a propagation phase shift between three collinear monochromatic waves by a non linear optical medium. The non linear optical medium is enclosed within a housing having a wall transparent to the waves. The phase shift has a specified value if the three waves travel a coherence wavelength in the medium and is compensated to another specified value each time if the three waves travel a periodic distance in the medium, where the periodic distance is less than the coherence length. An independent claim is also included for a wave generating device comprising a non linear optical medium in which two incident collinear monochromatic waves are injected to generate a third monochromatic wave.