Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/157737
Title: Integration of an anti-resonant hollow-core fiber with a multimode Yb-doped fiber for high power near-diffraction-limited laser operation
Authors: Li, Huizi
Goel, Charu
Zang, Jichao
Raghuraman, Sidharthan
Chen, Shaoxiang
Muhammad Rosdi Abu Hassan
Chang, Wonkeun
Yoo, Seongwoo
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2022
Source: Li, H., Goel, C., Zang, J., Raghuraman, S., Chen, S., Muhammad Rosdi Abu Hassan, Chang, W. & Yoo, S. (2022). Integration of an anti-resonant hollow-core fiber with a multimode Yb-doped fiber for high power near-diffraction-limited laser operation. Optics Express, 30(5), 7928-7937. https://dx.doi.org/10.1364/OE.451033
Project: QEP-P4
Journal: Optics Express
Abstract: We proposed and demonstrated mode cleaning in a high-power fiber laser by integrating an anti-resonant hollow-core fiber (AR-HCF) into a multimode laser cavity of an ytterbium (Yb)-doped fiber (YDF). An in-house mode-matched AR-HCF was fusion-spliced to a commercial multimode LMA-YDF, ensuring efficient fundamental mode coupling. The AR-HCF inflicts a high propagation loss selectively on higher-order modes, facilitating fundamental mode operation. Thus, the AR-HCF works as an efficient spatial mode filter embedded in the multimode fiber laser cavity and reinforces preferential amplification of the fundamental mode. Beam quality factor enhancement was achieved from M2 = 2.09 to 1.39 at an output power of 57.7 W (pump-power limited). The beam quality can be further improved by refining the AR-HCF fabrication. The proposed technique has a great potential to be exploited in other multimode fiber laser cavities involving erbium- or thulium-doped fibers and obviates the need for complicated specialty active fiber designs. Compared with the commonly used fiber bending technique, our method can achieve an efficient higher-order mode suppression without inducing mode-field deterioration.
URI: https://hdl.handle.net/10356/157737
ISSN: 1094-4087
DOI: 10.1364/OE.451033
Rights: © 2022 Optica Publishing Group under the terms of the OSA Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for noncommercial purposes and appropriate attribution is maintained. All other rights are reserved.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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