ناپایداری مدی در تقویت‌کننده فیبر ایتربیومی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه فیزیک، دانشکده علوم پایه، دانشگاه شهید مدنی آذربایجان

2 استادیار، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی، تهران، ایران، صندق پستی 14155-1339

3 3گروه فیزیک، دانشکده علوم پایه، دانشگاه ارومیه

چکیده

عوامل متعددی از قبیل اثرات غیرخطی و ناپایداری مدی در خروجی تقویت­کننده­ها و لیزرها فیبری پرتوان تأثیرگذار است. ازآنجاکه این افزاره­ها کاربردهای بسیاری در صنعت و پزشکی و ادوات نظامی دارند، ازاین‌رو مطالعه بر روی عوامل مختلف تأثیرگذار در خروجی آنها مستقیماً در طراحی تقویت­کننده­ها و لیزرهای فیبری پرتوان انعکاس می­یابد. در این مقاله ناپایداری مدی که بزرگ‌ترین عامل محدودکننده خروجی لیزرها و تقویت‌کننده‌های فیبری پرتوان است مورد مطالعه، شبیه­سازی و بررسی قرار گرفته است. در این افزاره­های توان بالا، به دلایل وجود نقص کوانتومی، تلفات و پراکندگی نور، دمای محیط افزایش می­یابد این امر باعث می­شود ضریب شکست محیط تغییر کند. تغییرات ضریب شکست عامل اصلی ناپایداری مدی در تقویت­کننده­ها و لیزرهای توان بالای فیبری است، در ناپایداری مدی،  مد پایه با اولین مد مرتبه بالاتر  تداخل کرده که موجب کاهش انرژی مد پایه می‌شود. در این مقاله تأثیر عوامل مختلف بر آستانه ناپایداری‌های مدی و انتقال توان از مد پایه به اولین مد مرتبه بالاتر مورد بررسی قرار گرفته است.

کلیدواژه‌ها


عنوان مقاله [English]

Mode Instability in the Ytterbium Doped Fiber Amplifier

نویسندگان [English]

  • Amir Sepahvand 1
  • maryam karimi 2
  • Kazem Jamshidi Ghaleh Jamshidi Ghaleh 1
  • Mahdi Amniat-Talab Amniat-Talab 3
  • Azin Shohani 1
1 Department of Physics, Azarbaijan Shahid Madani University, West Azarbaijan, Tabriz, Iran
2 Faculty of Plasma Research School, Nuclear Science and Technology Research Institute, Tehran, Iran, P.O. Box 14155-1339
3 Department of Physics, Urmia University, 11km SERO Road, Urmia, Iran
چکیده [English]

Different factors such as nonlinear phenomena and mode instability affect the output of the high-power fiber lasers and amplifiers. Since these devices have many applications in the industry, medicine, and military facilities, the study of the various factors’ effects on their output is directly reflected on the design of high-power lasers and amplifiers. In the present paper, the mode instability which is the major limiting factor on the output of high power lasers and amplifiers has been studied, simulated, and investigated. In these high-power devices, the temperature increases due to quantum defects, background loss, and light scattering, which change the refractive index of the fiber material. Variation of the refractive index is the main reason of mode instability in high power fiber lasers and amplifiers. Mode instability causes the coupling of the fundamental mode  to the upper-mode and thus decreases the fundamental mode’s energy. In this paper, different factors that affect the threshold of the mode instability and power transfer from the fundamental mode to the upper mode have been investigated.

کلیدواژه‌ها [English]

  • Mode instability
  • Dopant concentration
  • Refractive index change
  • Ytterbium doped fiber amplifier
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