{"id":428,"date":"2019-06-04T23:05:36","date_gmt":"2019-06-04T23:05:36","guid":{"rendered":"http:\/\/creolcms.smca.ucf.edu\/mir\/?page_id=428"},"modified":"2024-11-22T23:33:30","modified_gmt":"2024-11-22T23:33:30","slug":"photonic-thz-longwave-ir","status":"publish","type":"page","link":"https:\/\/www.creol.ucf.edu\/mir\/photonic-thz-longwave-ir\/","title":{"rendered":"Photonic THz, longwave IR__"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"428\" class=\"elementor elementor-428\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1e4f3242 elementor-section-stretched elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"1e4f3242\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;stretch_section&quot;:&quot;section-stretched&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-2e9a35b9\" data-id=\"2e9a35b9\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-23e0eea8 elementor-widget elementor-widget-heading\" data-id=\"23e0eea8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-large\">Photonic THz and longwave mid-IR generation<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-27be703 elementor-section-stretched elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"27be703\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;stretch_section&quot;:&quot;section-stretched&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-cb05cc7\" data-id=\"cb05cc7\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-00f4312 elementor-widget elementor-widget-text-editor\" data-id=\"00f4312\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"p1\"><strong><span class=\"s1\">Optical terahertz wave generation using periodic GaAs structures<\/span><\/strong><\/p><p class=\"p2\"><span class=\"s1\">Photonic generation of THz waves via frequency down conversion in electro-optic crystals is an attractive (thanks to the progress in developing compact near-IR optical sources) but inefficient (because of the \u03a9-cubed scaling factor, where \u03a9 is THz frequency) process. We develop photonic THz sources for imaging and spectroscopic application with much higher than state-of-the-art optical-to-THz conversion efficiency. These sources are based on (i) optical rectification of femtosecond pulses in a new material: periodically-inverted GaAs, where we produce monochromatic THz output tunable in the 0.5 \u2013 4.5 THz range [1-3] and (ii) resonantly-enhanced difference frequency mixing in periodically-inverted GaAs with picosecond [4,5] and continuous-wave [6] pumping. Here we take advantage of the enhancement of the optical field inside the cavity of a doubly-resonant optical parametric oscillator (OPO) (Fig. 2). We observed red-shifted satellites in the optical spectrum, suggesting that overcoming of Manley-Rowe conversion limit is possible due to cascaded THz generation (similar to cascaded Raman effect). This approach allowed generating of 1 mW of average THz power, potentially scalable to 10 \u2013 100 mW.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-5be5a2d2 elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"5be5a2d2\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1941c1d5\" data-id=\"1941c1d5\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3cf0f07c elementor-widget elementor-widget-image\" data-id=\"3cf0f07c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"785\" height=\"417\" src=\"https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/QPM_GaAs.jpg\" class=\"attachment-full size-full wp-image-854\" alt=\"\" srcset=\"https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/QPM_GaAs.jpg 785w, https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/QPM_GaAs-300x159.jpg 300w, https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/QPM_GaAs-768x408.jpg 768w\" sizes=\"(max-width: 785px) 100vw, 785px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Fig.1.  Periodically-inverted GaAs crystal for THz generation. Vertical dimension ~ 0.5 mm.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-447e6768 elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"447e6768\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-796bf6a\" data-id=\"796bf6a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-191341aa elementor-widget elementor-widget-image\" data-id=\"191341aa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"864\" height=\"384\" src=\"https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/OR-3-1.gif\" class=\"attachment-full size-full wp-image-856\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Fig.2. Quasi-monochromatic THz generation via optical rectification of femtosecond pump pulses in periodically-inverted crystal. Lower trace \u2013 E-field of the optical pulse. Upper trace \u2013 E-field of the THz pulse.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-5d178db6 elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"5d178db6\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-2f484671\" data-id=\"2f484671\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7bdd2dd5 elementor-widget elementor-widget-image\" data-id=\"7bdd2dd5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"859\" height=\"485\" src=\"https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/1ring_OPO-2.jpg\" class=\"attachment-full size-full wp-image-858\" alt=\"\" srcset=\"https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/1ring_OPO-2.jpg 859w, https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/1ring_OPO-2-300x169.jpg 300w, https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/1ring_OPO-2-768x434.jpg 768w\" sizes=\"(max-width: 859px) 100vw, 859px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Fig. 3.  Conceptual scheme for resonantly-enhanced THz-wave generation. Near-degenerate type-II doubly-resonant PPLN optical parametric oscillator produces two closely-spaced in frequency domain and orthogonally-polarized \u2018signal\u2019 and \u2018idler\u2019 waves near \u03bb=2 \u00b5m. THz output is produced at the beat frequency between these two waves, via frequency mixing in periodically-inverted quasi-phase-matched GaAs.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-37ff15c3 elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"37ff15c3\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1805aed9\" data-id=\"1805aed9\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-489c1163 elementor-widget elementor-widget-image\" data-id=\"489c1163\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"1390\" src=\"https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/Screen-Shot-2017-03-31-at-18.52-1920x1390.png\" class=\"attachment-full size-full wp-image-860\" alt=\"\" srcset=\"https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/Screen-Shot-2017-03-31-at-18.52-1920x1390.png 1920w, https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/Screen-Shot-2017-03-31-at-18.52-1920x1390-300x217.png 300w, https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/Screen-Shot-2017-03-31-at-18.52-1920x1390-768x556.png 768w, https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/Screen-Shot-2017-03-31-at-18.52-1920x1390-1024x741.png 1024w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Fig.4. Schematic of a THz imaging setup using up-conversion to near-IR in GaP crystal.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f7606fe elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"f7606fe\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6a861913\" data-id=\"6a861913\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3852be7b elementor-widget elementor-widget-image\" data-id=\"3852be7b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"1339\" src=\"https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/Screen-Shot-2017-03-31-at-18.53-1920x1339.png\" class=\"attachment-full size-full wp-image-862\" alt=\"\" srcset=\"https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/Screen-Shot-2017-03-31-at-18.53-1920x1339.png 1920w, https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/Screen-Shot-2017-03-31-at-18.53-1920x1339-300x209.png 300w, https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/Screen-Shot-2017-03-31-at-18.53-1920x1339-768x536.png 768w, https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/Screen-Shot-2017-03-31-at-18.53-1920x1339-1024x714.png 1024w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Fig.5. Real-time THz imaging via up-conversion.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-c7aa4f4 elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"c7aa4f4\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-20be99c\" data-id=\"20be99c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-92cac33 elementor-widget elementor-widget-video\" data-id=\"92cac33\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;video_type&quot;:&quot;hosted&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"e-hosted-video elementor-wrapper elementor-open-inline\">\n\t\t\t\t\t<video class=\"elementor-video\" src=\"https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/EnvelopePPTvideo_mute-copy.mp4\" controls=\"\" preload=\"metadata\" controlsList=\"nodownload\"><\/video>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6e159b4 elementor-section-stretched elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6e159b4\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;stretch_section&quot;:&quot;section-stretched&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-f4201e5\" data-id=\"f4201e5\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-121f08d elementor-widget elementor-widget-text-editor\" data-id=\"121f08d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"p1\" style=\"text-align: center\">Watch video: Real-time THz imaging via up-conversion.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-232cfab elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"232cfab\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-5299e85\" data-id=\"5299e85\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-690d315 elementor-widget elementor-widget-spacer\" data-id=\"690d315\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-57ab6cc0 elementor-section-stretched elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"57ab6cc0\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;stretch_section&quot;:&quot;section-stretched&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-23847cee\" data-id=\"23847cee\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-31dc4ae8 elementor-widget elementor-widget-text-editor\" data-id=\"31dc4ae8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"p1\"><span class=\"s1\">[1] K. L.Vodopyanov, M. M. Fejer, X. Yu, J. S. Harris, Y.-S. Lee, W. C. Hurlbut, V. G. Kozlov, D. Bliss, C. Lynch, <i>Terahertz wave generation in quasi-phase-matched GaAs<\/i>, Appl. Phys. Lett. 89141119 (2006)<\/span><\/p><p class=\"p1\"><span class=\"s1\">[2] K. L. Vodopyanov, <i>Optical generation of narrow-band terahertz packets in periodically-inverted electro-optic crystals: conversion efficiency and optimal laser pulse format<\/i>, Opt. Express 14, 2263-76 (2006)<\/span><\/p><p class=\"p1\"><span class=\"s1\">[3] G. Imeshev and M. E. Fermann, K. L. Vodopyanov and M. M. Fejer, X. Yu and J. S. Harris, D. Bliss and C. Lynch, <i>High-power source of THz radiation based on orientation-patterned GaAs pumped by a fiber laser<\/i>, Opt. Express 14, 4439-44 (2006)<\/span><\/p><p class=\"p1\"><span class=\"s1\">[4] J.E. Schaar, K.L. Vodopyanov, M.M. Fejer, <i>Intracavity terahertz-wave generation in a synchronously pumped optical parametric oscillator using quasi-phase-matched GaAs<\/i>, Opt. Lett. 32,1284-87 (2007)<\/span><\/p><p class=\"p1\"><span class=\"s1\">[5] K.L. Vodopyanov, <i>Optical THz-wave generation with periodically-inverted GaAs<\/i>, Laser &amp; Phot. Reviews 2, 11-25 (2008)<\/span><\/p><p class=\"p1\"><span class=\"s1\">[6] J. Kiessling, I. Breunig, P. G. Schunemann, K. Buse and K. L. Vodopyanov, <i>High power and spectral purity continuous-wave photonic THz source tunable from 1 to 4.5 THz for nonlinear molecular spectroscopy<\/i>, New Journal of Physics 15, 105014 (2013)<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-58941779 elementor-section-stretched elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"58941779\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;stretch_section&quot;:&quot;section-stretched&quot;,&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-68eb97e9\" data-id=\"68eb97e9\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4cfcd8f7 elementor-widget elementor-widget-image\" data-id=\"4cfcd8f7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.creol.ucf.edu\/mir\/\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"910\" height=\"910\" src=\"https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/logo-e1562098526577.png\" class=\"attachment-large size-large wp-image-817\" alt=\"\" srcset=\"https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/logo-e1562098526577.png 910w, https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/logo-e1562098526577-150x150.png 150w, https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/logo-e1562098526577-300x300.png 300w, https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/logo-e1562098526577-768x768.png 768w, https:\/\/www.creol.ucf.edu\/mir\/wp-content\/uploads\/sites\/7\/2019\/07\/logo-e1562098526577-575x575.png 575w\" sizes=\"(max-width: 910px) 100vw, 910px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-32411fad\" data-id=\"32411fad\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6b2336d7 elementor-widget elementor-widget-text-editor\" data-id=\"6b2336d7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Copyright \u00a9 2022 UCF-CREOL Mid-Infrared Combs Group. All rights reserved<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"Photonic THz and longwave mid-IR generation Optical terahertz wave generation using periodic GaAs structures Photonic generation of THz waves via frequency down conversion in electro-optic crystals is an attractive (thanks to the progress in developing compact near-IR optical sources) but inefficient (because of the \u03a9-cubed scaling factor, where \u03a9 is THz frequency) process. We develop [&hellip;]","protected":false},"author":28,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-428","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.creol.ucf.edu\/mir\/wp-json\/wp\/v2\/pages\/428","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.creol.ucf.edu\/mir\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.creol.ucf.edu\/mir\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.creol.ucf.edu\/mir\/wp-json\/wp\/v2\/users\/28"}],"replies":[{"embeddable":true,"href":"https:\/\/www.creol.ucf.edu\/mir\/wp-json\/wp\/v2\/comments?post=428"}],"version-history":[{"count":30,"href":"https:\/\/www.creol.ucf.edu\/mir\/wp-json\/wp\/v2\/pages\/428\/revisions"}],"predecessor-version":[{"id":2519,"href":"https:\/\/www.creol.ucf.edu\/mir\/wp-json\/wp\/v2\/pages\/428\/revisions\/2519"}],"wp:attachment":[{"href":"https:\/\/www.creol.ucf.edu\/mir\/wp-json\/wp\/v2\/media?parent=428"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}