بررسی خواص نوری یون‌های Nd3+ افزوده‌شده در حلال‌های معدنی و آلی با استفاده از نظریه جاد-آفلت

نوع مقاله : فیزیک - اپتیک و لیزر

نویسندگان

1 گروه فوتونیک، دانشکده شهید فخری زاده، دانشگاه جامع امام حسین(ع)، تهران ، ایران

2 استادیار، دانشکده علوم پایه، دانشگاه جامع امام حسین(ع)، تهران، ایران

3 پژوهشگر، دانشکده و پژوهشکده علوم پایه، دانشگاه جامع امام حسین(ع)، تهران، ایران

چکیده

اثرات حرارتی در لیزرهای پرتوان حالت جامد، توان خروجی آن‎ها را محدود می‎کند. محیط­های لیزری مایع افزوده‌شده به یون­های خاکی کمیاب، به دلیل مدیریت حرارتی مؤثر‌، به‌عنوان یک ‌راه‌حل جایگزین، توجه محققان این حوزه را به خود جلب کرده است. این تحقیق به بررسی خواص نوری یون‌های Nd³⁺ افزوده‌شده در حلال‌ معدنی POCl₃:SnCl₄ و ترکیب Nd(TFA)₃ افزوده‌شده در حلال آلی DMSO-d₆ با استفاده از نظریه جاد-آفلت می‌پردازد. با استفاده از این نظریه، می‌توان پارامترهای طیف‌سنجی شامل نسبت‌شاخه‌شدگی، طول عمر تابشی و سطح مقطع گسیل القایی را تعیین کرد که آگاهی از آن‌ها برای کاربردهای لیزری ضروری است. نسبت شاخه شدگی برای گذار 4I11/2 4F3/2 در هر دو محلول مورد بررسی بزرگ‌تر از 5/0 است که نشان‌دهنده پتانسیل بالای این گذار برای تولید لیزر است. طول عمر تابشی کل برای محلول‌های Nd3+:POCl3:SnCl4 و Nd(TFA)3:DMSO-d6 به ترتیب 𝜇s36/356 و 𝜇s21/562 محاسبه شدند. سطح مقطع گسیل القایی برای گذار 4I11/2 4F3/2 در محلول Nd3+:POCl3:SnCl4 بزرگ‌تر است و درنتیجه شدت خروجی لیزر را افزایش می‌دهد. همچنین توان پمپاژ آستانه و شدت اشباع برای لیزرهای چهار ترازی با حاصل‌ضرب سطح مقطع گسیل القایی در طول عمر تابشی نسبت معکوس دارد. محلول Nd3+:POCl3:SnCl4 در مقایسه با محلول Nd(TFA)3:DMSO-d6 توان پمپاژ آستانه و شدت اشباع کمتری دارد، بنابراین تولید لیزر از این محلول راحت‌تر است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Optical Properties of Nd3+ Ions Added in Inorganic and Organic Solvents Using Judd-Ofelt Theory

نویسندگان [English]

  • Saeid Saadat Nezhad 1
  • Ebrahim Haji Ali 2
  • Hadi Rahimian 3
  • Seyyed Ahmad Pour Hashemi 3
1 Photonics, Basic Science Imam Hossein University Tehran. Iran
2 assistant professor .Faculty of Science, Imam Hossein University, Tehran, Iran
3 Researcher, Faculty and Research Institute of Basic Sciences, Imam Hossein University, Tehran, Iran
چکیده [English]

Thermal effects in high-power solid-state lasers limit their power output. Liquid laser media added to rare earth ions, due to effective thermal management, have attracted the attention of researchers in this field as an alternative solution.. This research investigates the optical properties of Nd³⁺ ions added in inorganic solvent POCl₃:SnCl₄ and Nd(TFA)₃ compound added in organic solvent DMSO-d₆ using Judd-Ofelt theory. Using this theory, it is possible to determine spectroscopic parameters including branching ratios, radiative lifetimes and stimulated emission cross-sections, which are essential for laser applications. The branching ratio for the transition of  4I11/2 4F3/2 in both solutions is greater than 0.5, which indicates the high potential of this transition for laser production. The total radiative lifetim for Nd3+:POCl3:SnCl4 and Nd(TFA)3:DMSO-d6 solutions were calculated to be 356.36μs and 562.21μs, respectively. The induction stimulated emission cross-sectional for the transition of  4I11/2 4F3/2 in the Nd3+:POCl3:SnCl4 solution is larger, resulting in a higher laser output intensity. Also, the threshold pumping power and saturation intensity for four-level lasers are inversely proportional to the product of the stimulated emission cross-section by the radiative lifetim. Nd3+:POCl3:SnCl4 solution has lower threshold pumping power and saturation intensity compared to Nd(TFA)3:DMSO-d6 solution, so laser production from this solution is easier. The results obtained indicate a more suitable laser performance of the Nd³⁺:POCl₃:SnCl₄ solution compared to the Nd(TFA)₃:DMSO-d₆ solution, which is more considered due to the significant reduction of the toxicity and corrosivity effects of the Nd(TFA)₃:DMSO-d₆ solution.

کلیدواژه‌ها [English]

  • Nd³⁺ ion
  • Inorganic solvent
  • Organic solvent
  • Judd-Ofelt theory
  • Radiative transition probability
  • Branching ratios
  • Radiative lifetime
  • Stimulated emission cross-section

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