Abstract
We report a novel "single trench fiber" design for mode area scaling of the fundamental mode while offering effective single mode operation for a compact fiber laser device. This fiber design allows very high suppression of the higher order modes by offering high loss and power delocalization. It has the advantages of low cost and easy fabrication thanks to all solid fiber design, cylindrical symmetry, and higher refractive index of core as that of the cladding. A Yb-doped single trench fiber with a 40 µm core diameter has been fabricated from modified chemical vapor deposition process in conjunction with solution-doping offering an effective mode area of as large as ~1,000 µm(2) at 1,060 nm for the bend radius of 20 cm. Detailed characterizations confirm a robust single mode behavior of the fiber. Comparative analysis with other fiber designs shows significant performance enhancement of effective single mode operation suitable for fiber laser applications.
Highlights
High power fiber lasers have established themselves in laser market as an attractive light source due to their outstanding features such as good beam quality, better thermal management, small foot print, and flexibility [1,2]
As we mentioned in the introduction there are numerous fiber designs proposed by fiber community such as Low NA-SIF, H-photonic crystal fiber (PCF), leakage channel fiber (LCF), 2D-LCF, 2D-ASPBG, Bragg fiber, polygonal chirally coupled core fiber (P-CCC), and bend compensated parabolic fiber
We propose a novel fiber design single-trench fiber (STF) for large mode area fiber laser and amplifier
Summary
High power fiber lasers have established themselves in laser market as an attractive light source due to their outstanding features such as good beam quality, better thermal management, small foot print, and flexibility [1,2]. We proposed all-solid circular symmetrical design known as multi-trench fiber (MTF), which offers high loss to the HOMs induced by resonant coupling between HOMs of core and modes of resonant ring [17,18] This design has been fabricated by using conventional fabrication process such as modified chemical vapour deposition process (MCVD) in conjunction with rod-in-tube process and results have been reported in our previous studies [19,20]. The proposed design is an all solid fiber structure and can be post processed such as cleaving, splicing, and polishing etc
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