MgO:LiTaO₃ kristalida lazer nurlanishini parametrik kuchaytirish jarayonida yutilish ta’sirini o’rganish
Annotatsiya
Ushbu tadqiqotda MgO aralashgan litiy tantalat (MgO:LiTaO3) kristalida lazer nurlanishini optik parametrik kuchaytirish (OPK) jarayoni Matlab dasturi yordamida raqamli simulyatsiya qilindi. Tadqiqot chiziqli yutilish, uchinchi tartibli nochiziqlilik va dispersiya ta’sirlarini hisobga olgan holda infraqizil spektral diapazonda signal to‘lqinini kuchaytirishdagi asosiy cheklovchi omillarni aniqlashga qaratildi. Natijalar shuni ko‘rsatdiki, dispersiya impuls davomiyligi 10 fs dan kam bo‘lganda kuchaytirish samaradorligini sezilarli darajada cheklaydi, yutilish esa kristall qalinligi
1.2 mm dan oshganda asosiy cheklovchi omilga aylanadi. Ushbu natijalar telekommunikatsiya va ultraqisqa lazer tizimlari uchun ilg‘or optik kuchaytirgichlar ishlab chiqishga yo‘l ochadi va bu materialni BBO kabi an’anaviy alternativalardan ajratib turadi.
Maqsad. Domen qalinligi o‘zgarishlari va nochiziqli ta’sirlarni hisobga olgan holda signal to‘lqinining samaradorligi uchun analitik ifoda olish va MgO:LiTaO3 da chastota o‘zgartirishni optimallashtirish uchun yangi yondashuvni taklif qilish.
Materiallar va usullar. Qisqartirilgan nochiziqli bog‘langan to‘lqin tenglamalari kvazifazali sinxronizm (QFS) sharoitida split-step usuli, to‘rtinchi tartibli Runge-Kutta va tez Furye almashtirishlar (TFA).
Natijalar. Impuls davomiyligi 10 fs dan kam bo‘lganda dispersiya samaradorlikni 15–20% ga pasaytiradi, yutilish esa kristall qalinligi 1.2 mm dan oshganda 30% gacha yo‘qotishlarga olib keladi.
Xulosa. Olingan analitik ifoda MgO:LiTaO3 da OPK jarayonini optimallashtirish uchun asos bo‘lib xizmat qiladi va telekommunikatsiya hamda ultraqisqa lazer tizimlarida samaradorlikni 50% gacha oshirish imkonini beruvchi yangi optik kuchaytirgichlar ishlab chiqishga yo‘l ochadi.
Mualliflar haqida
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