All-fiber 7 &#215; 1 signal combiner with high beam quality for high-power fiber lasers

Hang Zhou; Zilun Chen; Xuanfeng Zhou; Jing Hou; Jinbao Chen

doi:10.3788/COL201513.061406

Journals >Chinese Optics Letters >Volume 13 >Issue 6 >Page 061406 > Article

Chinese Optics Letters
Vol. 13, Issue 6, 061406 (2015)

All-fiber 7 × 1 signal combiner with high beam quality for high-power fiber lasers

Hang Zhou, Zilun Chen^*, Xuanfeng Zhou, Jing Hou, and Jinbao Chen

Author Affiliations

College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China

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DOI: 10.3788/COL201513.061406 Cite this Article Set citation alerts

Hang Zhou, Zilun Chen, Xuanfeng Zhou, Jing Hou, Jinbao Chen. All-fiber 7 × 1 signal combiner with high beam quality for high-power fiber lasers[J]. Chinese Optics Letters, 2015, 13(6): 061406 Copy Citation Text

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Abstract

All-fiber signal combiner is a key component for augmenting the fiber laser power. Presently the reported

7 \times 1

signal combiners are all have output fibers with core diameters larger than 100 μm. In order to improve the beam quality of the combiner, a fiber with smaller core of 50 μm diameter is chose to be the output fiber. An all-fiber

7 \times 1

signal combiner is fabricated with measured power transmission efficiency around 99% for each port. The beam quality is improved and the measured

M^{2}

are around 6 which are matched well with the theoretically calculated results.

IB = AR \int_{0}^{Ω_{ϕ}} d Ω \propto A \int_{0}^{ϕ} \sin (φ) d φ = A [1 - \cos (ϕ)],

(1)

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IB \propto A [1 - \cos (ϕ)] \approx \frac{A}{2} {NA}^{2} .

(2)

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IB \propto \frac{π}{2} {(\frac{d}{2} NA)}^{2} .

(3)

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V = \frac{2 π a}{λ} \sqrt{n_{1}^{2} - n_{2}^{2}},

(4)

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V_{cc} (s) \approx \sqrt{\frac{2}{\ln s}} {(1 + \frac{0.26}{\ln s})}^{- \frac{1}{2}},

(5)

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Hang Zhou, Zilun Chen, Xuanfeng Zhou, Jing Hou, Jinbao Chen. All-fiber 7 × 1 signal combiner with high beam quality for high-power fiber lasers[J]. Chinese Optics Letters, 2015, 13(6): 061406

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