Self-Focusing in Transformer Oil with External Electric Field¹

Babar Hussain^a, *, Mushtaq Ahmed^a, Muhammad Nawaz^a, and Fazan Gul^b

^aNational Institute of Lasers and Optronics, Islamabad, 45650 Pakistan

^bDepartment of Applied Physics, Federal Urdu University, Islamabad 44000, Pakistan

*e-mail: babarhussain2002@hotmail.com

Received May 2, 2012; in final form August 7, 2012

Abstract—We report a pioneer observation of self-focusing in transformer oil with external electric field. The
experiments were conducted at variable powers (5–15 mW) of red He–Ne laser at various adjustable external elec-
tric field intensities (0–15 kV/cm). Self-defocusing in transformer oil is observed in the absence of electric field.
While with the applied electric field, self-focusing is witnessed that became excessively strong at high electric
field. It is further observed that beam divergence decreases with the increase of electric field and it reduces by
about 70% at 15 kV/cm. Self-focusing has been observed with both polarized and unpolarized laser light.

DOI: 10.1134/S1054660X1212002X

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