{"id":10834,"date":"2021-01-19T10:30:23","date_gmt":"2021-01-19T09:30:23","guid":{"rendered":"https:\/\/www.hilase.cz\/?p=10834"},"modified":"2021-01-19T11:56:36","modified_gmt":"2021-01-19T10:56:36","slug":"high-accuracy-measurement-of-bivoj-pulse-energy-using-radiation-pressure","status":"publish","type":"post","link":"https:\/\/www.hilase.cz\/en\/high-accuracy-measurement-of-bivoj-pulse-energy-using-radiation-pressure\/","title":{"rendered":"High-accuracy measurement of Bivoj pulse energy using radiation pressure"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[34],"class_list":["post-10834","post","type-post","status-publish","format-standard","hentry","category-news"],"acf":{"obrazek":{"ID":10853,"id":10853,"title":"DSC_0599","filename":"DSC_0599-2.jpg","filesize":141970,"url":"https:\/\/www.hilase.cz\/wp-content\/uploads\/DSC_0599-2.jpg","link":"https:\/\/www.hilase.cz\/en\/high-accuracy-measurement-of-bivoj-pulse-energy-using-radiation-pressure\/dsc_0599-3\/","alt":"","author":"10","description":"","caption":"","name":"dsc_0599-3","status":"inherit","uploaded_to":10834,"date":"2021-01-19 09:28:40","modified":"2021-01-19 09:30:03","menu_order":0,"mime_type":"image\/jpeg","type":"image","subtype":"jpeg","icon":"https:\/\/www.hilase.cz\/wp-includes\/images\/media\/default.png","width":1620,"height":1080,"sizes":{"thumbnail":"https:\/\/www.hilase.cz\/wp-content\/uploads\/DSC_0599-2-175x175.jpg","thumbnail-width":175,"thumbnail-height":175,"medium":"https:\/\/www.hilase.cz\/wp-content\/uploads\/DSC_0599-2-600x400.jpg","medium-width":600,"medium-height":400,"medium_large":"https:\/\/www.hilase.cz\/wp-content\/uploads\/DSC_0599-2-768x512.jpg","medium_large-width":768,"medium_large-height":512,"large":"https:\/\/www.hilase.cz\/wp-content\/uploads\/DSC_0599-2.jpg","large-width":1620,"large-height":1080,"1536x1536":"https:\/\/www.hilase.cz\/wp-content\/uploads\/DSC_0599-2-1536x1024.jpg","1536x1536-width":1536,"1536x1536-height":1024,"2048x2048":"https:\/\/www.hilase.cz\/wp-content\/uploads\/DSC_0599-2.jpg","2048x2048-width":1620,"2048x2048-height":1080,"image":"https:\/\/www.hilase.cz\/wp-content\/uploads\/DSC_0599-2-1170x484.jpg","image-width":1170,"image-height":484,"gallery":"https:\/\/www.hilase.cz\/wp-content\/uploads\/DSC_0599-2-273x210.jpg","gallery-width":273,"gallery-height":210,"card":"https:\/\/www.hilase.cz\/wp-content\/uploads\/DSC_0599-2-740x390.jpg","card-width":740,"card-height":390,"square":"https:\/\/www.hilase.cz\/wp-content\/uploads\/DSC_0599-2-360x360.jpg","square-width":360,"square-height":360}},"obsah":[{"acf_fc_layout":"text","text":"<h4><strong><span style=\"color: #66cc33;\">The first open access user experiment on the 100 J Bivoj laser was a major success!<\/span><br \/>\n<\/strong><\/h4>\n<p>In the experiment, two National metrology institutes in collaboration, NIST (P.A. Williams, K.A. Rogers, <a href=\"https:\/\/www.nist.gov\/\">National Institute of Standards and Technology<\/a>, USA) and CMI (M. \u0160m\u00edd, G. Porrovecchio, <a href=\"https:\/\/www.cmi.cz\/?language=en\">Czech Metrology Institute<\/a>, Czech Republic) demonstrated an alternative method of SI-traceable non-destructive (essentially non-absorbing) measurement of individual laser pulse energy pulse-by-pulse. The portable Radiation Pressure Power Meter (RPPM) developed by NIST was used in conjunction with the cutting-edge fast pulse photodetector developed by CMI. While the RPPM system directly measured the average optical power of a series of pulses, it calibrated the fast photodiode response in real-time to allow measurement of individual pulse energies at the 10 Hz repetition rate. This is the first time that the absolute energy of laser pulses (pulse-by-pulse) generated by the Bivoj laser has been directly measured with SI-traceability to the unit of mass.<\/p>\n<p>The proposal was approved in late 2019 with the experiment planned for early 2020, but due to the coronavirus COVID-19 pandemic, we had to postpone the experiment. NIST scientists participated in the experiment on-line from the USA and scientists from CMI installed the measurement system on site and operated it during the whole experiment.<\/p>\n<p><strong>During the experiment, HiLASE Bivoj laser reliably delivered several thousands of 100 J pulses at 10 Hz repetition rate.<\/strong><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.hilase.cz\/wp-content\/uploads\/Bivoj_CMI-4.png\" alt=\"CMI in blue overalls and HiLASE scientists in white overalls\" width=\"1144\" height=\"858\" \/> The energy of the laser pulses during the ramp from 3 J to 100 J captured during the experiment with scientists from CMI in blue overalls and HiLASE scientists in white overalls.<\/p>\n","oddelovace":"none"}]},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>High-accuracy measurement of Bivoj pulse energy using radiation pressure - 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