{"id":333486,"date":"2016-12-08T03:00:00","date_gmt":"2016-12-08T00:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=e08b66806f188c081f55882767436d6c"},"modified":"2016-12-08T03:00:00","modified_gmt":"2016-12-08T00:00:00","slug":"vortex-beam-generation-and-other-advanced-optics-experiments-reproduced-with-a-twisted-nematicliquid-crystal-display-with-limited-phase-modulation","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=333486","title":{"rendered":"Vortex beam generation and other advanced optics experiments reproduced with a twisted-nematic\r\nliquid-crystal display with limited phase modulation"},"content":{"rendered":"<p>In this work we propose the use of twisted-nematic liquid-crystal spatial light modulators<br \/>\n(TN-LC-SLM) as a useful tool for training students in the manipulation of light beams with<br \/>\nphase-only masks. In particular, we focus the work on the realization of phase-only gratings and<br \/>\nphase-only spiral phases for the generation of vortex beams, beams carrying orbital angular momentum<br \/>\n(OAM). Despite the extensive activity in this field, its experimental implementation for educational<br \/>\npurposes is limited because it requires the use of very expensive high-resolution liquid-crystal on<br \/>\nsilicon (LCOS) SLMs. Here, we show that a low-cost experimental implementation can be done with<br \/>\nolder TNLC technology. However, these devices, intended for display applications, exhibit rather<br \/>\nlimited optical phase modulation properties in comparison with modern LCOS devices, such as a very<br \/>\nlow range of phase modulation and a general coupled intensity modulation. However, we show that a<br \/>\nprecise characterizati&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this work we propose the use of twisted-nematic liquid-crystal spatial light modulators<br \/>\n(TN-LC-SLM) as a useful tool for training students in the manipulation of light beams with<br \/>\nphase-only masks. In particular, we focus the work on the realizatio&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-333486","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/333486","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=333486"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/333486\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=333486"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=333486"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=333486"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}