EXPERIMENTAL STUDY OF OPTICAL POWER EFFECT ON THE STRUCTURE OF FIBER-OPTICAL DIFFUSER OBTAINED BY FIBER CORE MELTING

Tokareva Ia.D., Konin Yu.A., Konnov K.A., Varzhel S.V., Dmitriev A.A., Bochkova S.D. Experimental study of optical power effect on the structure of fiber-optical diffuser obtained by fiber core melting. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2020, vol. 20, no. 4, pp. 494–499 (in Russian). doi: 10.17586/2226-1494-2020-20-4-494-499

Subject of Research. The paper presents experimental findings of a fiber-optic diffuser structure formed by optical fiber melting. Method. An optical scheme of ytterbium fiber laser is demonstrated consisting of such main components as: a laser pump diode (980 nm, with power up to 30 W), an active GTWave fiber (24 m), and two fiber Bragg gratings with reflection coefficients of 100 % and 30 %. The presented ytterbium radiation source is used to form a periodic structure of microcavities inside the fiber core using the melting effect of the material. The described technology application provides the creation of scattering structures with a given period without removing the protective acrylate fiber coating. Thus, there is no need for the optical fiber re-coating with a polymer composition, and its strength characteristics are maintained. Main Results. The experimental setup developed during the study gives the possibility to record the scattering structure in the core of the optical fiber by destroying the material using laser radiation. In order to determine the dependence of the properties of the created structures on the input radiation power, a number of samples was obtained recorded for various radiation characteristics. It was established experimentally that with an increase of laser radiation power, the period of localization of microcavities decreases. At the same time, their sizes are reduced, and the uniformity of the structure increases. The optimal radiation power value for the scattering structure formation is established to be about 2 W. Practical Relevance. The studied scattering structures can be used in medical research, laser photodynamic therapy, laser pacemakers, fluorescence diagnostics, and also as a backlight for minimally invasive operations. The fiber optic diffuser can be applicable as a sensor of physical quantities, in particular, for measuring high temperatures, since the upper limit of the diffuser working temperature is comparable to the melting temperature of the optical fiber quartz part.

1. Wang R., Qiao X. Hybrid optical fiber Fabry-Perot interferometer for simultaneous measurement of gas refractive index and temperature. Applied Optics, 2014, vol. 53, no. 32, pp. 7724–7728. doi: 10.1364/AO.53.007724

2. Domingues M.D.F., Paixao T.D., Mesquita E.F.T., Alberto N., Frias A.R., Ferreira R.A.S., Varum H., Antunes P.F.D., Andre P.S.D. Liquid hydrostatic pressure optical sensor based on micro-cavity produced by the catastrophic fuse effect. IEEE Sensors Journal, 2015, vol. 15, no. 10, pp. 5654–5658. doi: 10.1109/JSEN.2015.2446534

3. Alberto N., Tavares C., Domingues M.F., Correia S.F.H., Marques C., Antunes P., Pinto J.L., Ferreira R.A.S., André P.S. Relative humidity sensing using micro-cavities produced by the catastrophic fuse effect. Optical and Quantum Electronics, 2016, vol. 48, no. 3, pp. 216. doi: 10.1007/s11082-016-0491-4

4. Domingues M.F., Antunes P., Alberto N., Frias R., Ferreira R.A.S., Andre P. Cost effective refractive index sensor based on optical fiber micro cavities produced by the catastrophic fuse effect. Measurement, 2016, vol. 77, pp. 265–268. doi: 10.1016/j.measurement.2015.07.031

5. Rychnovsky S.J., Shinn M.G. Fiber optic diffuser and method of manufacture. Patent WO 1999023041 A1. 1999.

6. Artjushenko V.G., Danieljan G.L., Mazajshvili K.V., Meerovich G.A. Vessel and hollow organ radiation device. Patent RU 2571322, 2015. (in Russian)

7. Brown D.C. Diffuser fiber incident energy concentrator and method of using same. Patent US 4733929 A, 1986.

8. Gu X., Tam R.C.H. Optical fiber diffuser. Patent US 6398778 B1, 1999.

9. Toma A.I., Anisimova E.A. Vertebral foramen variant anatomy depending on column level. Traumatology and Orthopedics of Russia, 2008, no. 3(49), pp. 115–116. (in Russian)

10. Scherbakova V.A., Starikov S.S., Garanin A.I., Tokareva I.D., Bochkova S.D. Research of the tensioning sensitivity of a fiber optic sensor created with the catastrophic fuse effect. Proc. of the IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus 2020), 2020, pp. 1126–1128. doi: 10.1109/EIConRus49466.2020.9039429

11. Konin Iu.A., Bulatov M.I., Shcherbakova V.A., Garanin A.I., Tokareva Ia.D., Mosheva E.V. Features of single continuous fiber temperature sensor created by melting effect. Pribory i tehnika jeksperimenta, 2020, no. 4, pp. 78–82. (in Russian). doi: 10.31857/S003281622004028X

12. Konin Y.A., Garanin A.I., Tokareva I.D., Bochkova S.D. Study the full-fiber temperature sensor. Proc. of the International Scientific Conference High Technologies and Innovations in Science, 2019, pp. 205–209. (in Russian)

13. Shcherbakova V.A., Starikov S.S., Konin Y.A., Garanin A.I., Nurmuhametov D.I. Fuse effect investigation in optical fiber for creation optical sensor structure. Proc. of the IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (ElConRus 2019), 2019, pp. 914–916. doi: 10.1109/EIConRus.2019.8657220

14. Konin Y.A., Garanin A.I., Nurmuhametov D.I., Turin S.F., Shcherbakova V.A. Research the thermal sensitivity of a fiber optic sensor created with the catastrophic fuse. Proc. of the IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus 2019), 2019, pp. 897–900. doi: 10.1109/EIConRus.2019.8656714

15. Nurmuhametov D.I., Konin Y.A. Evaluation of parameters of an optical trap built based on tapered fiber for blood cells. Proc. of the IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus 2019), 2019, pp. 901–902. doi: 10.1109/EIConRus.2019.8657321

16. Konin Yu.A., Scherbakova V.A., Starikov S.S., Garanin A.I., Tokareva Ia.D. Research the thermal sensityvity of a fiber optic sensor created with the catastrophic fuse. PNRPU Bulletin. Electrotechnics, Informational Technologies, Control Systems, 2019, no. 32, pp. 90–104. (in Russian). doi: 10.15593/2224-9397/2019.4.06

17. Shin-ichi T. Fiber fuse propagation behavior. Selected Topics on Optical Fiber Technology, 2012, pp. 551–570. doi: 10.5772/26390

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License