کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5448957 1512516 2018 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of thermal deformation in cavity mirrors on beam propagation characteristics of high-power slab lasers
ترجمه فارسی عنوان
تاثیر تغییر شکل حرارتی در آینه های حفره بر روی خواص پرتوهای پرتو لیزرهای قدرت بالا
کلمات کلیدی
لیزر و لنز اپتیک، مشخصه پرتو لیزر، تغییر شکل حرارتی، پرتو لیزر شکل دادن،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
چکیده انگلیسی
Owing to their good diffusion cooling and low sensitivity to misalignment, slab-shape negative-branch unstable-waveguide resonators are widely used for high-power lasers in industry. As the output beam of the resonator is astigmatic, an external beam shaping system is required. However, the transverse dimension of the cavity mirrors in the resonator is large. For a long-time operation, the heating of cavity mirrors can be non-uniform. This results in micro-deformation and a change in the radius of curvature of the cavity mirrors, and leads to an output beam of an offset optical axis of the resonator. It was found that a change in the radius of curvature of 0.1% (1 mm) caused by thermal deformation generates a transverse displacement of 1.65 mm at the spatial filter of the external beam shaping system, and an output power loss of more than 80%. This can potentially burn out the spatial filter. In order to analyze the effect of the offset optical axis of the beam on the external optical path, we analyzed the transverse displacement and rotational misalignments of the spatial filter. For instance, if the transverse displacement was 0.3 mm, the loss in the output power was 9.6% and a sidelobe appeared in the unstable direction. If the angle of rotation was 5°, the loss in the output power was 2%, and the poles were in the direction of the waveguide. Based on these results, by adjusting the bending mirror, the deviation angle of the output beam of the resonator cavity was corrected, in order to obtain maximum output power and optimal beam quality. Finally, the propagation characteristics of the corrected output beam were analyzed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics Communications - Volume 407, 15 January 2018, Pages 97-106
نویسندگان
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