Air core Bragg fibers for delivery of near-infrared laser radiation

Michal Jelínek; Milan Frank; Václav Kubeček; Vlastimil Matějec; Ivan Kašík; Ondřej Podrazký

doi:10.1117/12.2175655

5 December 2014 Air core Bragg fibers for delivery of near-infrared laser radiation

Michal Jelínek, Milan Frank, Václav Kubeček, Vlastimil Matějec, Ivan Kašík, Ondřej Podrazký

Proceedings Volume 9441, 19th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 94411B (2014) https://doi.org/10.1117/12.2175655
Event: XIX Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2014, Jelenia Gora, Poland

Abstract

Optical fibers designed for high power laser radiation delivery represent important tools in medicine, solar systems, or industry. For such purposes several different types of glass optical fibers such as silica, sapphire, or chalcogenide ones as well as hollow-glass fibers, photonic crystal fibers and Bragg fibers have been investigated. Air-core Bragg fibers or photonic crystal fibers offer us the possibility of light transmission in a low dispersive material - air having a high damage threshold and small non-linear coefficient. However, preforms for drawing Bragg fibers can be fabricated by MCVD method similarly as preforms of standard silica fibers. In this paper we present fundamental characteristics of laboratory-designed and fabricated Bragg fibers with air cores intended for delivery of laser radiation at a wavelength range from 0.9 to 1.5 μm. Bragg fibers with different air core diameters of 5, 45 and 73 mm were prepared. The fiber core was surrounded by three pairs of circular Bragg layers. Each pair was composed of one layer with a high and one layer with a low refractive index with a contrast up to 0.03. Several laser sources emitting at 0.975, 1.06, and 1.55 μm were used as radiation sources. Attenuation coefficients, overall transmissions, bending losses, and spatial profiles of output beams from fibers were determined at these wavelengths. The lowest attenuation coefficient of 70 dB/km was determined for the 45 μm and 73 mm air-core fiber when radiation from a laser was launched into the fibers by using optical lenses. However, multimodal transmission has been observed in such condition. It has also been found that bending losses of such fibers are negligible for bending diameters higher than 15 mm.

Citation Download Citation

Michal Jelínek, Milan Frank, Václav Kubeček, Vlastimil Matějec, Ivan Kašík, and Ondřej Podrazký "Air core Bragg fibers for delivery of near-infrared laser radiation", Proc. SPIE 9441, 19th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 94411B (5 December 2014); https://doi.org/10.1117/12.2175655

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KEYWORDS

Optical fibers

Semiconductor lasers

Signal attenuation

Fiber lasers

Continuous wave operation

Silica

Nd:YAG lasers

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