Dye-doped gelatin films for phase-conjugation studies in undergraduate optics laboratory

T.Geethakrishnan; .P.K.Palanisamy

Anna University, Chennai-25

In the present paper, an overview of optical phase-conjugation and the experimental observation of optical phase-conjugation based on the degenerate four-wave mixing are presented. A continuous wave 633 nm He–Ne laser of total power 35 mW is used to generate phase conjugate signal from the Acid blue 7 (Alphazurine) dye-doped gelatin film. A maximum phase-conjugate reflectivity of 0.22 % has been observed in these dye films. Degenerate four-wave mixing based optical phase-conjugation can easily be demonstrated for undergraduate students in any optics laboratory using low power lasers.