{"id":351876,"date":"2017-01-09T03:00:00","date_gmt":"2017-01-09T00:00:00","guid":{"rendered":"https:\/\/www.fyysika.ee\/?guid=08dfd2d98c8217abc12ba2bc533c870a"},"modified":"2017-01-09T03:00:00","modified_gmt":"2017-01-09T00:00:00","slug":"femtosecond-measurements-of-electric-fields-from-classical-amplitudes-to-quantum-fluctuations-2","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=351876","title":{"rendered":"Femtosecond measurements of electric fields: from classical amplitudes to quantum fluctuations"},"content":{"rendered":"<p>Ultrabroadband electro-optic sampling is presented as an extremely sensitive technique to detect<br \/>\nelectric field amplitudes in free space. The temporal resolution provided by few-femtosecond laser<br \/>\npulses results in a bandwidth exceeding 100 THz, potentially covering the entire infrared spectral<br \/>\nrange. A pedagogic introduction to the operational principle of the method is given along the lines<br \/>\nof a classical coherent input field and a zincblende-type electro-optic sensor. We then show that<br \/>\neven the bare vacuum fluctuations of the electric field in the quantum ground state may be detected.<br \/>\nThis time-domain approach to quantum physics operates directly on sub-cycle scales where no local<br \/>\nenergy conservation holds. Therefore, signals may be obtained from purely virtual photons without<br \/>\namplification to finite intensity.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ultrabroadband electro-optic sampling is presented as an extremely sensitive technique to detect<br \/>\nelectric field amplitudes in free space. The temporal resolution provided by few-femtosecond laser<br \/>\npulses results in a bandwidth exceeding 100 THz, poten&#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-351876","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\/351876","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=351876"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/351876\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=351876"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=351876"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=351876"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}