Theory and application of electric-field-induced pseudorotation

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Abstract
The authors have used a sensitive laser polarimeter to measure the electric-field-induced dichroism on the transition 4f 66s2 7F0-4f 66s6p 7G1 of Sm I at lambda 639 nm. The dichroism gives an apparent (pseudo) optical rotation which can be sensitively detected using a Faraday modulator in the polarimeter. The results are interpreted in terms of the electric field coupling between the upper state of the transition and the nearby 4f 66s5d 7G1 level which lies only 322 GHz away. The value of the Stark matrix element mod (4f 66s5d 7G1 mod mod er mod mod 4f 66s6p 7G1) mod has been determined to be 0.85 (5) ea0, in broad agreement with theoretical estimates. Effects due to optical pumping and saturation caused by increased laser power have been observed and the theory of these phenomena is briefly reviewed. The transition 4f 66s2 7F0-4f 66s5d 7G1 has also been detected by laser polarimetry using electric field enhancement.

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