All-fiber 7x1 signal combiner for incoherent laser beam combining

Danny Noordegraaf; Martin D. Maack; Peter M. W. Skovgaard; Jeppe Johansen; Frank Becker; Steffen Belke; Mats Blomqvist; Jesper Lægsgaard

doi:10.1117/12.875078

All-fiber 7x1 signal combiner for incoherent laser beam combining

Danny Noordegraaf, Martin D. Maack, Peter M. W. Skovgaard, Jeppe Johansen, Frank Becker, Steffen Belke, Mats Blomqvist, Jesper Lægsgaard

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Abstract

We demonstrate an all-fiber 7x1 signal combiner for incoherent laser beam combining. This is a potential key component for reaching several kW of stabile laser output power. The combiner couples the output from 7 single-mode (SM) fiber lasers into a single multi-mode (MM) fiber. The input signal fibers have a core diameter of 17 μm and the output MM fiber has a core diameter of 100 μm. In a tapered section light gradually leaks out of the SM fibers and is captured by a surrounding fluorine-doped cladding. The combiner is tested up to 2.5 kW of combined output power and only a minor increase in device temperature is observed. At an intermediate power level of 600 W a beam parameter product (BPP) of 2.22 mm x mrad is measured, corresponding to an M2 value of 6.5. These values are approaching the theoretical limit dictated by brightness conservation.

Original language	English
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	7914
Pages (from-to)	79142L
ISSN	0277-786X
DOIs	https://doi.org/10.1117/12.875078
Publication status	Published - 2011
Event	Fiber Lasers 8: Technology, Systems, and Applications - San Francisco, CA, United States Duration: 24 Jan 2011 → 27 Jan 2011 Conference number: 8

Conference

Conference	Fiber Lasers 8
Number	8
Country/Territory	United States
City	San Francisco, CA
Period	24/01/2011 → 27/01/2011

Bibliographical note

Copyright 2011 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

Keywords

Beam combining
Fiber lasers

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http://spiedigitallibrary.org/proceedings/resource/2/psisdg/7914/1/79142L_1

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title = "All-fiber 7x1 signal combiner for incoherent laser beam combining",

abstract = "We demonstrate an all-fiber 7x1 signal combiner for incoherent laser beam combining. This is a potential key component for reaching several kW of stabile laser output power. The combiner couples the output from 7 single-mode (SM) fiber lasers into a single multi-mode (MM) fiber. The input signal fibers have a core diameter of 17 μm and the output MM fiber has a core diameter of 100 μm. In a tapered section light gradually leaks out of the SM fibers and is captured by a surrounding fluorine-doped cladding. The combiner is tested up to 2.5 kW of combined output power and only a minor increase in device temperature is observed. At an intermediate power level of 600 W a beam parameter product (BPP) of 2.22 mm x mrad is measured, corresponding to an M2 value of 6.5. These values are approaching the theoretical limit dictated by brightness conservation.",

keywords = "Beam combining, Fiber lasers",

author = "Danny Noordegraaf and Maack, {Martin D.} and Skovgaard, {Peter M. W.} and Jeppe Johansen and Frank Becker and Steffen Belke and Mats Blomqvist and Jesper L{\ae}gsgaard",

note = "Copyright 2011 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.; Fiber Lasers 8 : Technology, Systems, and Applications ; Conference date: 24-01-2011 Through 27-01-2011",

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doi = "10.1117/12.875078",

language = "English",

volume = "7914",

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T1 - All-fiber 7x1 signal combiner for incoherent laser beam combining

AU - Noordegraaf, Danny

AU - Maack, Martin D.

AU - Skovgaard, Peter M. W.

AU - Johansen, Jeppe

AU - Becker, Frank

AU - Belke, Steffen

AU - Blomqvist, Mats

AU - Lægsgaard, Jesper

N1 - Conference code: 8

PY - 2011

Y1 - 2011

N2 - We demonstrate an all-fiber 7x1 signal combiner for incoherent laser beam combining. This is a potential key component for reaching several kW of stabile laser output power. The combiner couples the output from 7 single-mode (SM) fiber lasers into a single multi-mode (MM) fiber. The input signal fibers have a core diameter of 17 μm and the output MM fiber has a core diameter of 100 μm. In a tapered section light gradually leaks out of the SM fibers and is captured by a surrounding fluorine-doped cladding. The combiner is tested up to 2.5 kW of combined output power and only a minor increase in device temperature is observed. At an intermediate power level of 600 W a beam parameter product (BPP) of 2.22 mm x mrad is measured, corresponding to an M2 value of 6.5. These values are approaching the theoretical limit dictated by brightness conservation.

AB - We demonstrate an all-fiber 7x1 signal combiner for incoherent laser beam combining. This is a potential key component for reaching several kW of stabile laser output power. The combiner couples the output from 7 single-mode (SM) fiber lasers into a single multi-mode (MM) fiber. The input signal fibers have a core diameter of 17 μm and the output MM fiber has a core diameter of 100 μm. In a tapered section light gradually leaks out of the SM fibers and is captured by a surrounding fluorine-doped cladding. The combiner is tested up to 2.5 kW of combined output power and only a minor increase in device temperature is observed. At an intermediate power level of 600 W a beam parameter product (BPP) of 2.22 mm x mrad is measured, corresponding to an M2 value of 6.5. These values are approaching the theoretical limit dictated by brightness conservation.

KW - Beam combining

KW - Fiber lasers

U2 - 10.1117/12.875078

DO - 10.1117/12.875078

M3 - Conference article

SN - 0277-786X

VL - 7914

SP - 79142L

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

T2 - Fiber Lasers 8

Y2 - 24 January 2011 through 27 January 2011

ER -

All-fiber 7x1 signal combiner for incoherent laser beam combining

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Conference

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