{"id":364617,"date":"2017-02-15T03:00:00","date_gmt":"2017-02-15T00:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=dba29cd4362d989b3f277400abc2e04f"},"modified":"2017-02-15T03:00:00","modified_gmt":"2017-02-15T00:00:00","slug":"determining-the-waist-radius-of-a-focused-gaussian-laser-beam-using-a-millimeter-scale-ruler","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=364617","title":{"rendered":"Determining the waist radius of a focused Gaussian laser beam using a millimeter-scale ruler"},"content":{"rendered":"<p>We present a simple and inexpensive method for determining the waist radius of a focused Gaussian<br \/>\nlaser beam. This method is motivated by the fact that if you focus the laser beam using a lens, the<br \/>\ndistance from the lens to the waist will vary slightly as the lens is moved along the<br \/>\nbeam-propagating direction. We show how the waist radius can be calculated from four large<br \/>\nlongitudinal lengths, measurable using a conventional millimeter-scale ruler. Analyzing the<br \/>\ndependence of the calculated waist radius on these four measured lengths numerically shows that the<br \/>\naccuracy of the calculated waist radius is mainly affected by the error in the relative shift in the<br \/>\ndistance from the lens to the waist position. The calculated waist radius for a real HeNe laser is<br \/>\nclose to the one measured\u00a0directly using a commercial beam profiler with an error within 7%.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We present a simple and inexpensive method for determining the waist radius of a focused Gaussian<br \/>\nlaser beam. This method is motivated by the fact that if you focus the laser beam using a lens, the<br \/>\ndistance from the lens to the waist will vary slight&#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-364617","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\/364617","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=364617"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/364617\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=364617"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=364617"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=364617"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}