{"id":9713,"date":"2022-08-22T03:32:33","date_gmt":"2022-08-22T03:32:33","guid":{"rendered":"https:\/\/www.szlaser.com\/?page_id=9713"},"modified":"2022-08-23T04:03:21","modified_gmt":"2022-08-23T04:03:21","slug":"frequency-quadrupling","status":"publish","type":"page","link":"https:\/\/www.szlaser.com\/index.php\/wiki\/frequency-quadrupling\/","title":{"rendered":"What is frequency quadrupling"},"content":{"rendered":"<div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1331.2px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-1 fusion-sep-none fusion-title-text fusion-title-size-one\"><h1 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:32;line-height:1.3;\"><h1>What is frequency quadrupling<\/h1><\/h1><\/div><div class=\"fusion-text fusion-text-1\"><p>This article introduces what is frequency quadrupling, the device of frequency quadrupling and the common frequency quadrupling process.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-2 fusion-sep-none fusion-title-text fusion-title-size-three\"><h3 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:24;line-height:1.3;\"><h3>Definition<\/h3><\/h3><\/div><div class=\"fusion-text fusion-text-2\"><p>An Effect Using Nonlinear Materials to Achieve Laser Frequency Four Times the Input Light Frequency<\/p>\n<p>Frequency quadrupling is a nonlinear frequency conversion, and the frequency of the obtained light is four times that of the input laser, that is, the wavelength of the output light is one-fourth of the input light. This process can be achieved by using two consecutive frequency multipliers (Figure 1). Another possible approach is to use a frequency doubler and two consecutive sum-frequency generation processes using the remaining pump light, but this approach is not common.<\/p>\n<p><img decoding=\"async\" class=\"lazyload alignnone size-full wp-image-9718\" src=\"https:\/\/www.szlaser.com\/wp-content\/uploads\/2022\/08\/frequency-quadrupling.png\" data-orig-src=\"https:\/\/www.szlaser.com\/wp-content\/uploads\/2022\/08\/frequency-quadrupling.png\" alt=\"\" width=\"406\" height=\"80\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27406%27%20height%3D%2780%27%20viewBox%3D%270%200%20406%2080%27%3E%3Crect%20width%3D%27406%27%20height%3D%2780%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/www.szlaser.com\/wp-content\/uploads\/2022\/08\/frequency-quadrupling-200x39.png 200w, https:\/\/www.szlaser.com\/wp-content\/uploads\/2022\/08\/frequency-quadrupling-300x59.png 300w, https:\/\/www.szlaser.com\/wp-content\/uploads\/2022\/08\/frequency-quadrupling-400x79.png 400w, https:\/\/www.szlaser.com\/wp-content\/uploads\/2022\/08\/frequency-quadrupling.png 406w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 406px) 100vw, 406px\" \/><\/p>\n<p>Typical quadrupling setup: An infrared input beam with a wavelength of 1064nm generates a green light with a wavelength of 532nm after a frequency doubling process, and the green light is frequency doubled again to generate light with a wavelength of 266nm.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-3 fusion-sep-none fusion-title-text fusion-title-size-three\"><h3 class=\"fusion-title-heading title-heading-left fusion-responsive-typography-calculated\" style=\"margin:0;--fontSize:24;line-height:1.3;\"><h3>Common Quadrupling Process<\/h3><\/h3><\/div><div class=\"fusion-text fusion-text-3\"><p>A common quadrupling process is as follows:<\/p>\n<p>A CW or pulsed light from a Nd:YAG laser with a wavelength of 1064 nm utilizes a frequency doubler (LBO based, Lithium Triborate) to generate green light with a wavelength of 532 nm, which then contributes to a second frequency doubler (CLBO based, Lithium Cesium Borate) produces light with a wavelength of 266nm. Such ultraviolet light has a wide range of applications in many fields, such as: pumping dye lasers or optical parametric oscillators, for Raman spectroscopy, for material processing (eg the preparation of fiber Bragg gratings).<\/p>\n<p>Limited operating life due to crystal degradation As mentioned in the article on frequency triples, nonlinear crystals can degrade due to the action of intense UV light. For the frequency quadrupling process, this short wavelength of UV light also causes the problem of shorter, sometimes more severe, lifetimes of crystals and other optics. For more information, see Frequency Triple.<\/p>\n<\/div><div style=\"text-align:right;\"><a class=\"fusion-button button-flat fusion-button-default-size button-default fusion-button-default button-1 fusion-button-default-span fusion-button-default-type\" target=\"_self\" href=\"https:\/\/www.szlaser.com\/index.php\/wiki\/laser-damage\/\"><span class=\"fusion-button-text awb-button__text awb-button__text--default\">Laser Damage In ophthalmology &gt;<\/span><\/a><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":7,"featured_media":0,"parent":8230,"menu_order":34,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-9713","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v18.7 (Yoast SEO v25.8) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is frequency quadrupling - 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