Improved photorefractive time response in ferroelectric tungsten bronze crystals

Recent results which show several ways to improve the photorefractive time response in strontium barium niobate and barium strontium potassium sodium niobate tungsten bronze crystals are presented. The techniques used were thermal, applied fields, self-generated internal fields, and focusing. Orders-of-magnitude improvements in the time response were demonstrated for beam fanning, self-pumped phase conjugation, and double phase conjugation.<>