{"id":168669,"date":"2022-04-20T09:38:18","date_gmt":"2022-04-20T09:38:18","guid":{"rendered":"\/forum\/forums\/topic\/gaussian-beam-source-and-pupil-function\/"},"modified":"2022-04-25T15:22:37","modified_gmt":"2022-04-25T15:22:37","slug":"gaussian-beam-source-and-pupil-function","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/gaussian-beam-source-and-pupil-function\/","title":{"rendered":"Gaussian beam source and pupil function"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hi, I have a few questions about the simulation of tightly-focused beams.<\/p>\n<p>1) How does the pupil function of a Gaussian beam relate to the far field projection? I inject fields with a Gaussian beam and a constant pupil function (NA=0.8). I collect the beam with a monitor and perform a far field calculation. Interestingly, the observed pattern is not constant, but seems to be a cosine(theta) shape. Shouldn&#039;t it be constant like the pupil function?<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/368\/YSHVX5YD9MYT.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/368\/YSHVX5YD9MYT.png\" alt=\"image1.PNG\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-168669","topic","type-topic","status-closed","hentry","topic-tag-gaussianbeam-2","topic-tag-pupil-1","topic-tag-rotated-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["1148"],"_bbp_likes_count":["0"],"_bbp_subscription":["26718"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["168669"],"_bbp_forum_id":["27833"],"_bbp_engagement":["2592","26718"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["212359"],"_bbp_last_active_id":["212359"],"_bbp_last_active_time":["2022-04-25 15:22:37"]},"test":"m-schnellnanogune-eu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/168669","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/168669\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=168669"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}