title: Simultaneous generation and Brillouin amplification of a dark hollow beam with a liquid-core optical fiber.
abstract: 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.
authors.affiliation: Department of optics information science and technology, Harbin University of Science and Technology, Harbin 150001, China. wei_g@163.com
authors.forename: Wei
authors.initials: W
authors.lastname: Gao
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Hu
authors.forename: Di
authors.initials: D
authors.lastname: Sun
authors.forename: Jianyi
authors.initials: J
authors.lastname: Li
mesh_terms: D000669:Amplifiers, Electronic; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D044085:Microfluidics / Q000295:instrumentation*; D012996:Solutions
chemical_list: D012996:Solutions