High-reflectivity self-pumped phase conjugator using total internal reflection in KNbNO3:Fe

Abstract
A self‐pumped phase conjugate reflectivity of 74.8% is obtained with a suitably cut KNbO3:Fe crystal in a polygonal shape. The design and operation of this self‐pumped phase conjugator is described. The build‐up time is observed to be dependent on the input power. The phase conjugate nature of the retroreflected beam has been further confirmed by a significant decrease in the specular reflectivity of the input surface of the crystal.