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Silver mirror coated deep seated negative axicon optical fiber tip for highly efficient Bessel-Gauss beam generation

In this work we report sliver mirror coated Deep Seated Negative Axicon (DSNA) optical fiber tip which significantly reduces the output power loss and increases the percentage Bessel-Gauss beam power output as compared to non-coated DSNA. The silver mirror has been deposited on the cladding of a highly Ge doped single mode double clad optical fiber using Tollen’s reagent and Glucose solution. DSNA is fabricated after deposition of the silver mirror. This coated DSNA is compared with a non-coated DSNA for measured output power by coupling with a He-Ne Laser. The measurement shows that after coating 88% of the total output power is contributing to the formation of Bessel-Gauss beam whereas it is just 30% in case of non-coated DSNA. The power in central spot of the Bessel-Gauss beam has also been increased from ~7% to ~12% of the power contributing in Bessel-Gauss beam generation. This silver mirror coated DSNA fiber tip could significantly improve the image contrast, Signal to noise ratio and sensitivity of the DSNA based Common-path optical coherence tomography system.