Application of optical phase conjugation to plasma diagnostics (invited)

Several possibilities for plasma diagnostics provided by optical phase conjugation and, in particular, self‐pumped phase conjugation in barium titanate (BaTiO3) are discussed. These include placing a plasma within a dye laser cavity equipped with a phase conjugate mirror for intracavity absorption measurements, time differential refractometry with high spatial resolution, and simplified real‐time holographic interferometry. The principles of phase conjugation with particular reference to photorefractive media and the special advantages of self‐pumped phase conjugation are reviewed prior to the discussion of the applications. Distinctions are made in the applications between those for which photorefractive conjugators are essential and those for which they only offer experimental simplification relative to other types of phase conjugators.

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