Dr. Rajib Bordoloi Profile

Dr. Rajib Bordoloi

Department Head at Tinsukia College

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laser - matter interaction

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Proceedings Article | 19 May 2009 Paper

Observation of laser induced Optogalvanic-like effect in liquid: a case of optical nutation of the dipole vectors

R. Bordoloi, R. Bora, G. Baruah

Proceedings Volume 7354, 73541D (2009) https://doi.org/10.1117/12.820683

KEYWORDS: Molecules, Liquids, Electrodes, Ions, Molecular lasers, Laser sources, Transient nonlinear optics, Molecular interactions, Electromagnetism, Nonlinear optics

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We report here a laser induced transient dip in the electrical conductivity of some crude toxic samples of organic origin prepared in liquid base. The electrical conductivity variation of the samples under laser exposure indicates to the occurrence of phenomenon similar to Optogalvanic effect in liquid. In the Optogalvanic effect the current of a discharging gas varies (may increase or decrease) as the discharge cavity is irradiated by a resonant electromagnetic field. This phenomenon, which has thoroughly been investigated both theoretically and experimentally for last few decades, has not been reported so far in liquid medium. In our work the samples in liquid base were placed between the electrodes of a conductivity tester and their respective electrical conductivities were measured. Once the laser was switched on in the cavity between the electrodes of the tester, the conductivity went down nearly by an amount ranging from 0.2% to 0.5% of the original values. The dip in conductivity was temporary and disappeared as soon as the laser source was removed. The experimental results are being explained in the light of Optical Nutation of the dipole moments of the molecules caused by the resonant nonlinear interaction of the molecules with the electric field of the laser. As an extension of F. Bloch's work on nuclear induction to optical frequency, we have shown that the Nutation of the dipole vectors of the interacting molecules cause a dephasing among them. This dephasing, which the key to our observation, leads to a decrease in the electrical polarizability of the medium, which finally decreases the ion production rate between the electrodes and the detector shows a dip in conductivity.

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