{"id":4822,"date":"2022-08-16T12:46:00","date_gmt":"2022-08-16T12:46:00","guid":{"rendered":"https:\/\/www.greenstone-tech.com\/?p=4822"},"modified":"2025-10-31T03:01:16","modified_gmt":"2025-10-31T03:01:16","slug":"jak-zlepsit-stabilitu-vysokovykonnych-vlaknovych-laseru","status":"publish","type":"post","link":"https:\/\/www.greenstone-tech.com\/cs\/how-to-improve-the-stability-of-high-power-fiber-lasers\/","title":{"rendered":"Jak zlep\u0161it stabilitu vysokov\u00fdkonn\u00fdch vl\u00e1knov\u00fdch laser\u016f?"},"content":{"rendered":"

A vl\u00e1knov\u00fd laser<\/strong> pou\u017e\u00edv\u00e1 jako zesilovac\u00ed m\u00e9dium sklen\u011bn\u00e9 vl\u00e1kno dopovan\u00e9 vz\u00e1cn\u00fdmi zeminami a vl\u00e1kno dopovan\u00e9 ytterbiem je jednou z hlavn\u00edch sou\u010d\u00e1st\u00ed vysoce v\u00fdkonn\u00fdch laserov\u00fdch syst\u00e9m\u016f s vl\u00e1kny dopovan\u00fdmi ytterbiem. Vzhledem k tomu, \u017ee v\u00fdstupn\u00ed v\u00fdkon vl\u00e1knov\u00e9 lasery<\/strong> zvy\u0161uje, se objevily r\u016fzn\u00e9 \u201czabij\u00e1ky\u201d stability, jako je p\u0159\u00ed\u010dn\u00e1 nestabilita (TMI), stimulovan\u00fd Raman\u016fv rozptyl (SRS) a tepeln\u00e9 po\u0161kozen\u00ed.<\/p>\n\n\n\n

Ned\u00e1vno se Zhao Juyun, produktov\u00fd \u0159editel spole\u010dnosti Kepin Fiber Laser, pod\u011blil o sv\u00e9 online post\u0159ehy na t\u00e9ma \u201cNejmodern\u011bj\u0161\u00ed technologie a inovativn\u00ed aplikace vysokov\u00fdkonn\u00fdch vl\u00e1knov\u00fdch laser\u016f\u201d, kde podrobn\u011b popsal, jak bojovat proti \u201czabij\u00e1k\u016fm\u201d stability ve vl\u00e1knov\u00e9 lasery<\/strong>. Zopakujme si hlavn\u00ed body, o kter\u00fdch jsme hovo\u0159ili.<\/p>\n\n\n\n

Princip a struktura vl\u00e1knov\u00e9ho laseru<\/strong><\/strong><\/h5>\n\n\n\n

A vl\u00e1knov\u00fd laser<\/strong> se skl\u00e1d\u00e1 p\u0159edev\u0161\u00edm ze t\u0159\u00ed komponent: zdroje \u010derpadla, zesilovac\u00edho m\u00e9dia (aktivn\u00edho vl\u00e1kna) a dutiny rezon\u00e1toru.<\/p>\n\n\n\n

Princip vl\u00e1knov\u00e9ho laseru s rezon\u00e1torovou dutinou<\/strong>: V\u00fdkon \u010derpac\u00edho polovodi\u010dov\u00e9ho laseru je vst\u0159ikov\u00e1n do ytterbiem dopovan\u00e9ho dvoupl\u00e1\u0161\u0165ov\u00e9ho vl\u00e1kna (YDF) p\u0159es vl\u00e1knov\u00e9 m\u0159\u00ed\u017eky (HR pro vysokou odrazivost, OC pro n\u00edzkou odrazivost). Vl\u00e1kno dopovan\u00e9 ytterbiem absorbuje sv\u011btlo \u010derpadla, co\u017e vede k popula\u010dn\u00ed inverzi a generuje spont\u00e1nn\u00ed z\u00e1\u0159en\u00ed. Toto z\u00e1\u0159en\u00ed je pak zes\u00edleno stimulovanou emis\u00ed v dutin\u011b tvo\u0159en\u00e9 vl\u00e1knov\u00fdmi m\u0159\u00ed\u017ekami, \u010d\u00edm\u017e vznik\u00e1 laserov\u00fd v\u00fdstup, kter\u00fd je n\u00e1sledn\u011b vyveden v\u00fdstupn\u00edm optick\u00fdm kabelem.<\/p>\n\n\n\n

Struktura zesilova\u010de Princip vl\u00e1knov\u00e9ho laseru<\/strong>: Podobn\u011b jako u rezon\u00e1torov\u00e9 dutiny je rozd\u00edl v z\u00e1rode\u010dn\u00e9m laseru z p\u0159edchoz\u00edho stupn\u011b, kter\u00fd sni\u017euje n\u00e1roky na v\u00fdkon jednotliv\u00fdch komponent, a umo\u017e\u0148uje tak vy\u0161\u0161\u00ed v\u00fdstupn\u00ed v\u00fdkon.<\/p>\n\n\n\n

Efekt p\u0159\u00ed\u010dn\u00e9 nestability m\u00f3du (TMI) ve vl\u00e1knov\u00fdch laserech<\/strong><\/strong><\/h5>\n\n\n\n

K nestabilit\u011b v p\u0159\u00ed\u010dn\u00e9m m\u00f3du (TMI) doch\u00e1z\u00ed, kdy\u017e se p\u0159i vysok\u00e9m v\u00fdkonu vl\u00e1knov\u00e9 lasery<\/strong> dos\u00e1hnout ur\u010dit\u00e9 prahov\u00e9 hodnoty. S rostouc\u00edm v\u00fdstupn\u00edm v\u00fdkonem nebo po ur\u010dit\u00e9 dob\u011b se v\u00fdstupn\u00ed re\u017eim p\u0159epne z ust\u00e1len\u00e9ho z\u00e1kladn\u00edho re\u017eimu na nestabiln\u00ed re\u017eim vysok\u00e9ho \u0159\u00e1du. To vede ke zhor\u0161en\u00ed kvality paprsku a omezuje zvy\u0161ov\u00e1n\u00ed v\u00fdstupn\u00edho v\u00fdkonu. V z\u00e1va\u017en\u00fdch p\u0159\u00edpadech to m\u016f\u017ee naru\u0161it \u00fa\u010dinnost vl\u00e1knov\u00fd laser<\/strong>, tak\u017ee je m\u00e9n\u011b \u00fa\u010dinn\u00fd, ne\u017e je inzerov\u00e1no.<\/p>\n\n\n\n

Princip a experiment\u00e1ln\u00ed \u00fadaje o nestabilit\u011b re\u017eimu<\/strong><\/strong><\/h6>\n\n\n\n

Pot\u00e9, co dojde k nestabilit\u011b re\u017eimu, se v\u00fdkon mezi z\u00e1kladn\u00edm a vy\u0161\u0161\u00edm re\u017eimem nad\u00e1le spojuje, \u010d\u00edm\u017e se udr\u017euje konstantn\u00ed celkov\u00fd v\u00fdkon. Pokud jsou p\u0159\u00edtomny mechanismy, jako je filtrov\u00e1n\u00ed ohyb\u016f, m\u00e1 z\u00e1kladn\u00ed m\u00f3d men\u0161\u00ed ztr\u00e1ty a u m\u00f3d\u016f vy\u0161\u0161\u00edho \u0159\u00e1du doch\u00e1z\u00ed k v\u00fdrazn\u011bj\u0161\u00edm ztr\u00e1t\u00e1m ohybem, co\u017e m\u00e1 za n\u00e1sledek, \u017ee m\u00f3dy vy\u0161\u0161\u00edho \u0159\u00e1du jsou odfiltrov\u00e1ny a v\u00fdstup vykazuje v \u010dasov\u00e9 oblasti chv\u011bn\u00ed z\u00e1kladn\u00edho m\u00f3du.<\/p>\n\n\n\n

Faktory ovliv\u0148uj\u00edc\u00ed nestabilitu re\u017eimu<\/strong><\/strong><\/h6>\n\n\n\n

Na rozd\u00edl od tradi\u010dn\u00edch vysokoenergetick\u00fdch laser\u016f je nestabilita m\u00f3du zp\u016fsobena tepeln\u00fdmi efekty a vazbou mezi m\u00f3dy vl\u00e1kna. Proto se faktory ovliv\u0148uj\u00edc\u00ed nestabilitu m\u00f3du net\u00fdkaj\u00ed pouze odpadn\u00edho tepla, ale tak\u00e9 m\u00f3dov\u00fdch charakteristik vl\u00e1kna. Hlavn\u00edmi ovliv\u0148uj\u00edc\u00edmi faktory jsou:<\/p>\n\n\n\n

Charakteristiky dopov\u00e1n\u00ed vl\u00e1ken<\/strong>: Koncentrace dopov\u00e1n\u00ed a polom\u011br dopovan\u00e9 oblasti.<\/p>\n\n\n\n

\u00da\u010dinky ztmaven\u00ed<\/strong>: Vliv na sv\u011bteln\u00fd v\u00fdkon sign\u00e1lu, \u0161umovou s\u00edlu sign\u00e1lu a pom\u011br po\u010d\u00e1te\u010dn\u00edch re\u017eim\u016f vysok\u00e9ho \u0159\u00e1du sign\u00e1lu.<\/p>\n\n\n\n

Charakteristika \u010derpadla<\/strong>: V\u00fdkon \u010derpadla, vlnov\u00e1 d\u00e9lka a modulace intenzity.<\/p>\n\n\n\n

Metoda \u010derpadla<\/strong>: \u010cerp\u00e1n\u00ed vp\u0159ed, \u010derp\u00e1n\u00ed vzad, bo\u010dn\u00ed \u010derp\u00e1n\u00ed a obousm\u011brn\u00e9 \u010derp\u00e1n\u00ed.<\/p>\n\n\n\n

Materi\u00e1l vl\u00e1ken<\/strong>: Pr\u016fm\u011br j\u00e1dra vl\u00e1kna, pr\u016fm\u011br pl\u00e1\u0161t\u011b a numerick\u00e1 apertura.<\/p>\n\n\n\n

Faktory ovliv\u0148uj\u00edc\u00ed re\u017eim vl\u00e1kna<\/strong>: M\u00f3dov\u00e9 ztr\u00e1ty vysok\u00e9ho \u0159\u00e1du, schopnost chlazen\u00ed syst\u00e9mu a polariza\u010dn\u00ed vlastnosti vl\u00e1kna.<\/p>\n\n\n\n

Metody potla\u010den\u00ed nestability re\u017eimu<\/strong><\/strong><\/h6>\n\n\n\n

Opat\u0159en\u00ed proti nestabilit\u011b re\u017eim\u016f se zam\u011b\u0159uj\u00ed na zlep\u0161en\u00ed tepeln\u00e9ho managementu a mo\u017enost\u00ed \u0159\u00edzen\u00ed re\u017eim\u016f.<\/p>\n\n\n\n

Zlep\u0161en\u00ed tepeln\u00e9ho managementu<\/strong>: \u00dapravou pom\u011bru j\u00e1dra a pl\u00e1\u0161t\u011b vl\u00e1kna, zm\u011bnou vlnov\u00e9 d\u00e9lky polovodi\u010dov\u00e9 pumpy, zv\u00fd\u0161en\u00edm v\u00fdkonu vst\u0159ikov\u00e1n\u00ed sign\u00e1lu a optimalizac\u00ed sm\u011bru sv\u011btla pumpy lze zlep\u0161it saturaci zisku a sn\u00ed\u017eit tepeln\u00e9 po\u0161kozen\u00ed.<\/p>\n\n\n\n

Zlep\u0161en\u00ed \u0159\u00edzen\u00ed re\u017eimu<\/strong>: Zv\u00fd\u0161en\u00ed ztr\u00e1t v ohybu (zmen\u0161en\u00edm polom\u011bru ohybu, sn\u00ed\u017een\u00edm numerick\u00e9 apertury j\u00e1dra vl\u00e1kna a optimalizac\u00ed metod nav\u00edjen\u00ed vl\u00e1kna) m\u016f\u017ee pomoci potla\u010dit m\u00f3dy vy\u0161\u0161\u00edho \u0159\u00e1du a zlep\u0161it stabilitu v\u00fdstupu.<\/p>\n\n\n\n

Stimulovan\u00fd Raman\u016fv rozptyl (SRS) ve vl\u00e1knov\u00fdch laserech<\/strong><\/strong><\/h5>\n\n\n\n

Ke stimulovan\u00e9mu Ramanovu rozptylu (SRS) doch\u00e1z\u00ed p\u0159i interakci laserov\u00e9ho fotonu s prost\u0159ed\u00edm, kter\u00e1 zp\u016fsob\u00ed posun k del\u0161\u00edm vlnov\u00fdm d\u00e9lk\u00e1m. SRS je hlavn\u00edm neline\u00e1rn\u00edm efektem, kter\u00fd omezuje n\u00e1r\u016fst vlnov\u00fdch d\u00e9lek. vl\u00e1knov\u00fd laser<\/strong> energie. U vl\u00e1ken dopovan\u00fdch ytterbiem z\u00e1vis\u00ed efekt SRS na pr\u016fm\u011bru j\u00e1dra, d\u00e9lce vl\u00e1kna, koncentraci dopov\u00e1n\u00ed a zp\u016fsobu \u010derp\u00e1n\u00ed.<\/p>\n\n\n\n

Metody potla\u010den\u00ed stimulovan\u00e9ho Ramanova rozptylu<\/strong><\/strong><\/h6>\n\n\n\n

Pr\u016fm\u011br j\u00e1dra N\u00e1raz<\/strong>: S rostouc\u00edm v\u00fdkonem \u010derpadla doch\u00e1z\u00ed k SRS p\u0159i vy\u0161\u0161\u00edch \u00farovn\u00edch v\u00fdkonu \u010derpadla. Zv\u011bt\u0161ov\u00e1n\u00ed pr\u016fm\u011bru j\u00e1dra vl\u00e1kna v\u00fdrazn\u011b zvy\u0161uje prahov\u00fd v\u00fdkon SRS.<\/p>\n\n\n\n

Vliv d\u00e9lky vl\u00e1kna<\/strong>: S rostouc\u00ed d\u00e9lkou vl\u00e1kna se SRS sni\u017euje. Sn\u00ed\u017een\u00edm d\u00e9lky vl\u00e1kna lze zv\u00fd\u0161it v\u00fdstupn\u00ed v\u00fdkon.<\/p>\n\n\n\n

Dopingov\u00fd dopad koncentrace<\/strong>: S rostouc\u00ed koncentrac\u00ed dopov\u00e1n\u00ed se sni\u017euje pr\u00e1h SRS, co\u017e vede k ni\u017e\u0161\u00edmu v\u00fdstupn\u00edmu v\u00fdkonu laseru. U vysoce v\u00fdkonn\u00fdch vl\u00e1knov\u00fdch laser\u016f se pro zm\u00edrn\u011bn\u00ed \u00fa\u010dink\u016f SRS vol\u00ed vl\u00e1kna s n\u00edzkou koncentrac\u00ed dopov\u00e1n\u00ed.<\/p>\n\n\n\n

Budouc\u00ed v\u00fdvoj v oblasti vl\u00e1knov\u00e9 laserov\u00e9 technologie<\/strong><\/strong><\/h5>\n\n\n\n

D\u00edky pokrok\u016fm v technologii optick\u00fdch vl\u00e1ken s velkou oblast\u00ed zisku (Large Mode Area - LMA), vysoce v\u00fdkonn\u00fdm polovodi\u010dov\u00fdm zdroj\u016fm \u010derpadel s vysok\u00fdm jasem a technologii spojov\u00e1n\u00ed \u010derpadel s vysok\u00fdm v\u00fdkonem, vl\u00e1knov\u00e9 lasery<\/strong> se o\u010dek\u00e1v\u00e1 dal\u0161\u00ed v\u00fdvoj sm\u011brem k vy\u0161\u0161\u00edm v\u00fdkon\u016fm a lep\u0161\u00ed kvalit\u011b paprsk\u016f.<\/p>","protected":false},"excerpt":{"rendered":"

A fiber laser uses rare-earth-doped glass fiber as the gain medium, and ytterbium-doped fiber is one of the core components in high-power ytterbium-doped fiber laser systems. As the output power of fiber lasers increases, various stability “killers” like Transverse Mode Instability (TMI), Stimulated Raman Scattering (SRS), and thermal damage have emerged as challenges. Recently, Zhao Juyun, the […]<\/p>\n","protected":false},"author":1,"featured_media":4825,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[5,3],"tags":[102],"table_tags":[],"class_list":["post-4822","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-professional-knowledge","category-blog","tag-sheldon-li"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.greenstone-tech.com\/cs\/wp-json\/wp\/v2\/posts\/4822","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.greenstone-tech.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.greenstone-tech.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.greenstone-tech.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.greenstone-tech.com\/cs\/wp-json\/wp\/v2\/comments?post=4822"}],"version-history":[{"count":2,"href":"https:\/\/www.greenstone-tech.com\/cs\/wp-json\/wp\/v2\/posts\/4822\/revisions"}],"predecessor-version":[{"id":5216,"href":"https:\/\/www.greenstone-tech.com\/cs\/wp-json\/wp\/v2\/posts\/4822\/revisions\/5216"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.greenstone-tech.com\/cs\/wp-json\/wp\/v2\/media\/4825"}],"wp:attachment":[{"href":"https:\/\/www.greenstone-tech.com\/cs\/wp-json\/wp\/v2\/media?parent=4822"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.greenstone-tech.com\/cs\/wp-json\/wp\/v2\/categories?post=4822"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.greenstone-tech.com\/cs\/wp-json\/wp\/v2\/tags?post=4822"},{"taxonomy":"table_tags","embeddable":true,"href":"https:\/\/www.greenstone-tech.com\/cs\/wp-json\/wp\/v2\/table_tags?post=4822"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}