Fiber facet gratings for high power fiber lasers

Martin Vanek; Jan Vanis; Yauhen Baravets; Filip Todorov; Jiri Ctyroky; Pavel Honzatko

doi:10.1117/12.2293605

1 December 2017 Fiber facet gratings for high power fiber lasers

Martin Vanek, Jan Vanis, Yauhen Baravets, Filip Todorov, Jiri Ctyroky, Pavel Honzatko

Proceedings Volume 10603, Photonics, Devices, and Systems VII; 106030J (2017) https://doi.org/10.1117/12.2293605
Event: Photonics Prague 2017, 2017, Prague, Czech Republic

Abstract

We numerically investigated the properties of diffraction gratings designated for fabrication on the facet of an optical fiber. The gratings are intended to be used in high-power fiber lasers as mirrors either with a low or high reflectivity. The modal reflectance of low reflectivity polarizing grating has a value close to 3% for TE mode while it is significantly suppressed for TM mode. Such a grating can be fabricated on laser output fiber facet. The polarizing grating with high modal reflectance is designed as a leaky-mode resonant diffraction grating. The grating can be etched in a thin layer of high index dielectric which is sputtered on fiber facet. We used refractive index of Ta₂O₅ for such a layer. We found that modal reflectance can be close to 0.95 for TE polarization and polarization extinction ratio achieves 18 dB. Rigorous coupled wave analysis was used for fast optimization of grating parameters while aperiodic rigorous coupled wave analysis, Fourier modal method and finite difference time domain method were compared and used to compute modal reflectance of designed gratings.

Citation Download Citation

Martin Vanek, Jan Vanis, Yauhen Baravets, Filip Todorov, Jiri Ctyroky, and Pavel Honzatko "Fiber facet gratings for high power fiber lasers", Proc. SPIE 10603, Photonics, Devices, and Systems VII, 106030J (1 December 2017); https://doi.org/10.1117/12.2293605

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