Thermo-optic behaviour of intrinsically single-mode low-numerical aperture (NA) ytterbium-doped fibre
A simplified model based on the finite-element method is proposed to study the thermo-optic behavior in high-power fiber amplifiers. It is shown that thermally induced refractive index change results in a thermal lens effect and ultimately leads to multimode behavior even in an intrinsically single-...
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| Veröffentlicht in: | Laser physics 2019-07, Vol.29 (7), p.75106 |
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| container_issue | 7 |
| container_start_page | 75106 |
| container_title | Laser physics |
| container_volume | 29 |
| creator | Zhang, Fangfang Xing, Yingbin Liao, Lei Wang, Yibo Xu, Haozhen Chen, Yisha Dai, Nengli Yang, Luyun Li, Haiqing Li, Jinyan |
| description | A simplified model based on the finite-element method is proposed to study the thermo-optic behavior in high-power fiber amplifiers. It is shown that thermally induced refractive index change results in a thermal lens effect and ultimately leads to multimode behavior even in an intrinsically single-mode fiber. Besides, experimental investigations were carried out to characterize the thermo-optic behavior of an intrinsically single-mode large mode area 20/400 ytterbium-doped fiber with core numerical aperture (NA) ~ 0.04 in an all-fiber amplifier. Output power up to 1.68 kW was achieved with a deterioration of beam quality from M2 |
| doi_str_mv | 10.1088/1555-6611/ab2116 |
| format | Article |
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It is shown that thermally induced refractive index change results in a thermal lens effect and ultimately leads to multimode behavior even in an intrinsically single-mode fiber. Besides, experimental investigations were carried out to characterize the thermo-optic behavior of an intrinsically single-mode large mode area 20/400 ytterbium-doped fiber with core numerical aperture (NA) ~ 0.04 in an all-fiber amplifier. Output power up to 1.68 kW was achieved with a deterioration of beam quality from M2 < 1.1 to 1.7. It is explained that due to the uneven distribution of axial heat load, an intrinsically single-mode fiber gradually turns into a combination of a multi-mode fiber and a single-mode fiber with the growing heat load and then the leakage core modes trigger transverse mode instability. Moreover, a near diffraction-limited output power of 1.35 kW from an all-fiberized low-NA fiber amplifier is obtained.</description><identifier>ISSN: 1054-660X</identifier><identifier>EISSN: 1555-6611</identifier><identifier>DOI: 10.1088/1555-6611/ab2116</identifier><identifier>CODEN: LAPHEJ</identifier><language>eng</language><publisher>IOP Publishing</publisher><subject>fibre amplifier ; low-numerical aperture (NA) fibre ; mode instability ; thermal effects</subject><ispartof>Laser physics, 2019-07, Vol.29 (7), p.75106</ispartof><rights>2019 Astro Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c311t-444a57ca7eee9f9d865496a3a3816ec919d4d94c6ecbab9c484381ee10faff4b3</citedby><cites>FETCH-LOGICAL-c311t-444a57ca7eee9f9d865496a3a3816ec919d4d94c6ecbab9c484381ee10faff4b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.1088/1555-6611/ab2116/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>314,776,780,27901,27902,53821,53868</link.rule.ids></links><search><creatorcontrib>Zhang, Fangfang</creatorcontrib><creatorcontrib>Xing, Yingbin</creatorcontrib><creatorcontrib>Liao, Lei</creatorcontrib><creatorcontrib>Wang, Yibo</creatorcontrib><creatorcontrib>Xu, Haozhen</creatorcontrib><creatorcontrib>Chen, Yisha</creatorcontrib><creatorcontrib>Dai, Nengli</creatorcontrib><creatorcontrib>Yang, Luyun</creatorcontrib><creatorcontrib>Li, Haiqing</creatorcontrib><creatorcontrib>Li, Jinyan</creatorcontrib><title>Thermo-optic behaviour of intrinsically single-mode low-numerical aperture (NA) ytterbium-doped fibre</title><title>Laser physics</title><addtitle>LP</addtitle><addtitle>Laser Phys</addtitle><description>A simplified model based on the finite-element method is proposed to study the thermo-optic behavior in high-power fiber amplifiers. It is shown that thermally induced refractive index change results in a thermal lens effect and ultimately leads to multimode behavior even in an intrinsically single-mode fiber. Besides, experimental investigations were carried out to characterize the thermo-optic behavior of an intrinsically single-mode large mode area 20/400 ytterbium-doped fiber with core numerical aperture (NA) ~ 0.04 in an all-fiber amplifier. Output power up to 1.68 kW was achieved with a deterioration of beam quality from M2 < 1.1 to 1.7. It is explained that due to the uneven distribution of axial heat load, an intrinsically single-mode fiber gradually turns into a combination of a multi-mode fiber and a single-mode fiber with the growing heat load and then the leakage core modes trigger transverse mode instability. Moreover, a near diffraction-limited output power of 1.35 kW from an all-fiberized low-NA fiber amplifier is obtained.</description><subject>fibre amplifier</subject><subject>low-numerical aperture (NA) fibre</subject><subject>mode instability</subject><subject>thermal effects</subject><issn>1054-660X</issn><issn>1555-6611</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNp1UE1LxDAUDKLgunr3mJMoGDdvm3ab47L4BYteVvAW0vTFzdI2JW2V_femrHjS0xvezDzmDSGXwO-A5_kM0jRlWQYw08UcIDsik9_VccQ8FRHz91Ny1nU7zoUQHCYEN1sMtWe-7Z2hBW71p_NDoN5S1_TBNZ0zuqr2tHPNR4Ws9iXSyn-xZqgxjBzVLYZ-CEivX5Y3dN_3GAo31Kz0LZbUuiLgOTmxuurw4mdOydvD_Wb1xNavj8-r5ZqZBKBnMZNOF0YvEFFaWeZZKmSmE53kkKGRIEtRSmEiLnQhjchFZBCBW22tKJIp4Ye7JviuC2hVG1ytw14BV2NNauxEjZ2oQ03RcnWwON-qXXy9iQFV1aq5VAvFFynwTLWljcLbP4T_3v0GKqR31g</recordid><startdate>20190701</startdate><enddate>20190701</enddate><creator>Zhang, Fangfang</creator><creator>Xing, Yingbin</creator><creator>Liao, Lei</creator><creator>Wang, Yibo</creator><creator>Xu, Haozhen</creator><creator>Chen, Yisha</creator><creator>Dai, Nengli</creator><creator>Yang, Luyun</creator><creator>Li, Haiqing</creator><creator>Li, Jinyan</creator><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>20190701</creationdate><title>Thermo-optic behaviour of intrinsically single-mode low-numerical aperture (NA) ytterbium-doped fibre</title><author>Zhang, Fangfang ; Xing, Yingbin ; Liao, Lei ; Wang, Yibo ; Xu, Haozhen ; Chen, Yisha ; Dai, Nengli ; Yang, Luyun ; Li, Haiqing ; Li, Jinyan</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c311t-444a57ca7eee9f9d865496a3a3816ec919d4d94c6ecbab9c484381ee10faff4b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>fibre amplifier</topic><topic>low-numerical aperture (NA) fibre</topic><topic>mode instability</topic><topic>thermal effects</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhang, Fangfang</creatorcontrib><creatorcontrib>Xing, Yingbin</creatorcontrib><creatorcontrib>Liao, Lei</creatorcontrib><creatorcontrib>Wang, Yibo</creatorcontrib><creatorcontrib>Xu, Haozhen</creatorcontrib><creatorcontrib>Chen, Yisha</creatorcontrib><creatorcontrib>Dai, Nengli</creatorcontrib><creatorcontrib>Yang, Luyun</creatorcontrib><creatorcontrib>Li, Haiqing</creatorcontrib><creatorcontrib>Li, Jinyan</creatorcontrib><collection>CrossRef</collection><jtitle>Laser physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhang, Fangfang</au><au>Xing, Yingbin</au><au>Liao, Lei</au><au>Wang, Yibo</au><au>Xu, Haozhen</au><au>Chen, Yisha</au><au>Dai, Nengli</au><au>Yang, Luyun</au><au>Li, Haiqing</au><au>Li, Jinyan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Thermo-optic behaviour of intrinsically single-mode low-numerical aperture (NA) ytterbium-doped fibre</atitle><jtitle>Laser physics</jtitle><stitle>LP</stitle><addtitle>Laser Phys</addtitle><date>2019-07-01</date><risdate>2019</risdate><volume>29</volume><issue>7</issue><spage>75106</spage><pages>75106-</pages><issn>1054-660X</issn><eissn>1555-6611</eissn><coden>LAPHEJ</coden><abstract>A simplified model based on the finite-element method is proposed to study the thermo-optic behavior in high-power fiber amplifiers. It is shown that thermally induced refractive index change results in a thermal lens effect and ultimately leads to multimode behavior even in an intrinsically single-mode fiber. Besides, experimental investigations were carried out to characterize the thermo-optic behavior of an intrinsically single-mode large mode area 20/400 ytterbium-doped fiber with core numerical aperture (NA) ~ 0.04 in an all-fiber amplifier. Output power up to 1.68 kW was achieved with a deterioration of beam quality from M2 < 1.1 to 1.7. It is explained that due to the uneven distribution of axial heat load, an intrinsically single-mode fiber gradually turns into a combination of a multi-mode fiber and a single-mode fiber with the growing heat load and then the leakage core modes trigger transverse mode instability. Moreover, a near diffraction-limited output power of 1.35 kW from an all-fiberized low-NA fiber amplifier is obtained.</abstract><pub>IOP Publishing</pub><doi>10.1088/1555-6611/ab2116</doi><tpages>8</tpages></addata></record> |
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| ispartof | Laser physics, 2019-07, Vol.29 (7), p.75106 |
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| source | IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | fibre amplifier low-numerical aperture (NA) fibre mode instability thermal effects |
| title | Thermo-optic behaviour of intrinsically single-mode low-numerical aperture (NA) ytterbium-doped fibre |
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