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Opt Express. 2012 Aug 27;20(18):20715-20. doi: 10.1364/OE.20.020715.

Simultaneous generation and Brillouin amplification of a dark hollow beam with a liquid-core optical fiber.

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  • 1Department of optics information science and technology, Harbin University of Science and Technology, Harbin 150001, China.


We propose and demonstrate a new method to generate a dark hollow beam (DHB) and amplify it simultaneously by a liquid-core optical fiber (LCOF) filled with CS2. A DHB with an adjustable dark spot size (DSS) is simply obtained by changing the incident angle of the laser beam. Based on non-collinear Brillouin amplification, a weak DHB can be amplified with high gain. The amplification factor of 10(6) is achieved for a DHB of 4pJ. This DHB should have promising applications in many fields due to its compact structure, low cost, wide adjustment range of the DSS, and wide operating wavelength.

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