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مقالۀ پژوهشی: جبران اثرات نبود همسانی فاز گرمایی در تولید هماهنگ دوم توان بالا با استفاده از چرپشدگی بلور غیرخطی قطبیده دوره‌ای | ||
| فیزیک کاربردی ایران | ||
| دوره 12، شماره 4 - شماره پیاپی 31، دی 1401، صفحه 62-75 اصل مقاله (2.93 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22051/ijap.2022.40161.1277 | ||
| نویسنده | ||
| سعید قوامی صبوری* | ||
| دانشیار، دانشکده فیزیک، دانشگاه اصفهان، اصفهان، ایران | ||
| چکیده | ||
| اثرات حرارتی تاثیرات نامطلوبی در فرآیند تولید هماهنگ دوم به ویژه در توان‌های بالای لیزر دمش می‌گذارد. تولید توزیع دمایی نایکنواخت در بلور از راه جذب پرتوهای دمش و هماهنگ دوم منجر به افت شدید بازده تبدیل هماهنگ دوم می‌شود. این جذب به عنوان چشمه گرما در بلور عمل کرده و از باقی ماندن بلور در دمای همسانی فاز جلوگیری می‌کند، در نتیجه پدیده‌ای به نام نبود همسانی فاز گرمایی در بلور ایجاد می‌شود. در این مقاله ابتدا یک مدل نظری برای شبیه‌سازی اثرات حرارتی در تولید هماهنگ دوم شناسانده شده است. سپس با در نظر گرفتن یک بلور قطبیده دوره‌ای به عنوان بلور غیرخطی و افزودن چرپشدگی به دوره تناوب آن، راهکاری برای جبران نبود همسانی فاز گرمایی بیان شده است. نتایج شبیه‌سازی نشان می‌دهد که چرپشدگی یک بلور قطبی دوره‌ای سبب جبران اثرات گرمایی در بلور غیرخطی شده و تا حد زیادی افت بازده هماهنگ دوم را جبران می‌کند. به عنوان مثال، در توان دمش 20 وات اثرات حرارتی موجب کاهش بازده تبدیل هماهنگ دوم از 74 درصد به 18 درصد شده و با به کار بردن بلور قطبیده دوره‌ای چرپ‌شده بازده به 50 درصد رسیده است. | ||
| کلیدواژه‌ها | ||
| تولید هماهنگ دوم؛ اثرات حرارتی؛ بلورقطبیده دوره‌ای | ||
| عنوان مقاله [English] | ||
| Research Paper: Compensation of Thermal Phase Mismatch Effects in The High Power Second Harmonic Generation Using a Chirped Periodically Poled Non-linear Crystal | ||
| نویسندگان [English] | ||
| Saeed Ghavami Sabouri | ||
| Associate Professor, Faculty of Physics, University of Isfahan, Isfahan, Iran | ||
| چکیده [English] | ||
| Thermal effects strongly influence the process of second harmonic generation, especially at high fundamental powers. The generation of non-uniform temperature distribution in the crystal due to the absorption of fundamental and second harmonic waves leads to significant degradation of the efficiency of the second harmonic generation process. This absorption acts as a heat source in the crystal and prevents the crystal from remaining at the phase matching temperature, resulting in a phenomenon called thermal phase mismatch in the crystal. In this paper, first, a theoretical model to simulate the thermal effects in the second harmonic generation is introduced. Then, by considering a periodically poled crystal as a nonlinear crystal and adding a chirp to its periodicity, a solution to compensate for the thermal phase mismatch is presented. Simulation results show that the chirp of a periodically poled crystal compensates for the thermal effects on the nonlinear crystal and largely offsets the efficiency degradation in the second harmonic generation. For example, at the fundamental power of 20 W, the thermal effects reduce the second-harmonic conversion efficiency from 74% to 18% and using the chirped periodically poled crystal increases the efficiency to 50%. | ||
| کلیدواژه‌ها [English] | ||
| Second Harmonic Generation, Thermal Effects, Periodically Poled Crystal | ||
| مراجع | ||
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