نوع مقاله: مقاله پژوهشی
نویسندگان
1 پژوهشکده ی پلاسما و گداخت هسته ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران،
2 پژوهشکده پلاسما و گداخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای
چکیده
برای دست‌یابی به کیفیت بالای لیزرهای پرتو ایکس نرم که طول عمر محیط بهره‌ی پلاسمایی آن‌ها کوتاه است، استفاده از تشدیدگرهای ناپایدار خودپالاینده (SFUR)، مناسب به نظر می‌رسد. در این پژوهش به بررسی نظری تشدیدگر ناپایدار خودپالاینده (SFUR) در یک و دو بُعد برای لیزر پرتو ایکس نرم شبه نئون آهن با طول موج nm 25.5 و بیشینه بهره‌ی 1-cm 124پرداخته شده است که واگرایی کوچک (mrad 0.5~) باریکه‌ی لیزر را به همراه دارد. هم‌چنین تأثیر اندازه‌ی روزنه‌ی محدودکننده‌ی میدان در انتشار مد خروجی و کیفیت پرتو خروجی با استفاده از ضریب M2 بررسی شده است. این تشدیدگر در مقایسه با تشدیدگر صفحه موازی با طول معادل، از ضریب کیفیت کوچک‌‌تر و باریکه‌ی خروجی با واگرایی کم‌تر و کیفیت مُد بسیار بهتری برخوردار است و می‌تواند سبب افزایش همدوسی فضایی باریکه‌ی لیزر شود.
کلیدواژه‌ها
عنوان مقاله [English]
Investigation of Soft X-Ray Laser with Plasma Active Medium and Self-Filtering Unstable Resonator
نویسندگان [English]
- A.H Farahbod 1
- G Ghani-Moghadam 2
چکیده [English]
This paper proposes that self-filtering unstable resonator (SFUR) is suitable to be used in soft x-ray lasers possessing an active medium with a short-gain-lifetime. For this purpose, a self-filtering unstable resonator (SFUR), in one and two dimensions with Ne-like Fe soft x-ray active medium at 25.5 nm and maximum gain 124 cm-1, has been theoretically investigated to obtain a low beam divergence of ~ 0.5 mrad. The role of the field-limiting aperture in mode propagation has also been shown. In addition, the beam quality factor M2 has been calculated and the output mode behavior has been investigated and compared with a plane-parallel (PP) resonator of equal length. The calculations indicate that the M2 factor in SFUR resonator is smaller than the PP resonator and therefore the output beam divergence is lower and the mode quality is much better resulting in a higher beam spatial coherency.
کلیدواژه‌ها [English]
- Self-Filtering Unstable Resonator (SFUR)
- Soft X-Ray Laser (SXRL)
- Mode Quality
- Spatial Coherency
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