{"id":67864,"date":"2023-05-01T05:35:33","date_gmt":"2023-05-01T11:35:33","guid":{"rendered":"http:\/\/www.teamwavelength.com\/maintenance\/?page_id=67864"},"modified":"2023-05-01T05:41:19","modified_gmt":"2023-05-01T11:41:19","slug":"laser-tec-connect-april-2023","status":"publish","type":"page","link":"https:\/\/www.teamwavelength.com\/maintenance\/company-info\/newsletter\/laser-tec-connect-april-2023\/","title":{"rendered":"LASER \/ TEC CONNECT April 2023"},"content":{"rendered":"
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CASE STUDY: High-Definition Video Broadcasting with QCLs<\/a><\/em><\/h4>\n
Free-space communications can overcome the logistical difficulties of broadband connections in remote or rural areas. By using long wave infrared (LWIR) quantum cascade lasers (QCLs) as optical sources, high data rates can be transmitted error-free, eliminating the need for physical connections. By experimenting with live video broadcasting at different levels of video formats, researchers realized free-space live video broadcasting with a room temperature QCL at a wavelength of 8.1 \u03bcm. The high definition video format (1280 pixels x 720 pixels) is transmitted at a data rate of 1.485 Gbits\/s without any errors.<\/div>\n
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High definition video broadcasting requires high precision and stable control of the quantum cascade laser in signal transmission. Wavelength Electronics’ QCL driver,\u00a0QCL2000 LAB<\/a>, enabled precise current control with minimal electronic noise from the QCL. The driver also provides analog modulation of up to 2-3 MHz for wavelength modulation, allowing the QCL to emit a constant, uninterrupted signal that is subsequently modulated for communication purposes. The transmission was studied for several hours at a time, indicating the long term stability of the QCL2000 LAB current driver.\u00a0 In addition, the stability of the QCL bias current is critical for consistent electrical bandwidth. The low noise, high stability QCL2000 LAB, can precisely deliver up to 2 A to the laser. This benchtop instrument exhibits noise performance of 1.3 \u03bcA RMS up to 100 kHz with an average current noise density of 4 nA\/\u221aHz.\u00a0 Wavelength Electronics\u2019 QCL driver enables high definition video broadcasting with a data rate of 1.485 Gbits\/s with low noise and stable laser output. This makes the developed QCL system a reliable tool for real field applications in free-space communication.<\/p>\n

Read the full case study<\/a>.<\/p>\n<\/div>\n[\/vc_column_text][vc_column_text css=”.vc_custom_1620066007387{margin-bottom: 0px !important;}”]\n\n\n\n
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<\/h4>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n[\/vc_column_text][\/vc_column][vc_column width=”1\/2″][vc_single_image image=”67866″ img_size=”600×400″ onclick=”custom_link” img_link_target=”_blank” link=”http:\/\/www.teamwavelength.com\/maintenance\/download\/applicationtechnotes\/cs-ld07.pdf”][\/vc_column][\/vc_row][vc_row css=”.vc_custom_1507146836113{margin-top: 5px !important;background-color: #000000 !important;}”][vc_column width=”3\/4″][vc_empty_space height=”12px”][mk_fancy_title color=”#ffffff” size=”22″ force_font_size=”true” size_smallscreen=”20″ size_tablet=”18″ size_phone=”16″ txt_transform=”uppercase” margin_top=”10″ font_family=”none”]Subscribe to our newsletter for tips, techniques & product updates.[\/mk_fancy_title][\/vc_column][vc_column width=”1\/4″][mk_button dimension=”flat” corner_style=”rounded” size=”medium” url=”http:\/\/teamwavelength.us4.list-manage.com\/subscribe?u=e683bb028455c6da2682e79a6&id=cb59ea9375″ target=”_blank” align=”center” margin_top=”15″]Subscribe [\/mk_button][\/vc_column][\/vc_row][vc_row][vc_column][vc_empty_space height=”22px”][\/vc_column][\/vc_row][vc_row][vc_column width=”1\/2″][vc_single_image image=”67867″ img_size=”full” alignment=”center” onclick=”custom_link” img_link_target=”_blank” link=”http:\/\/www.teamwavelength.com\/maintenance\/download\/applicationtechnotes\/cs-ldtc12.pdf”][vc_column_text css=”.vc_custom_1682940845983{margin-bottom: 0px !important;}”]\n

CASE STUDY: Mapping H2O Transport with Tomographic Absorption Spectroscopy<\/a>\u00a0<\/em><\/h4>\n
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Researchers from the School of Aeronautics and Astronautics in Chengdu, China and the Chinese University of Hong Kong have developed a jet flow, tomographic absorption spectroscopy (TAS) platform to study H2<\/sub>O transport in a non-reactive jet flow with various conditions. By combining tomography and absorption spectroscopy techniques with a laser with center wavelength of 1368.598 nm, two-dimension (2D) contour imaging was created to display H2<\/sub>O mole fraction distribution from the laminar jet into ambient air. The reconstructed distributions at different heights above the jet flow nozzle, as well as the 2D contour, matched well with and were validated with computational fluid dynamics (CFD) simulations. This research shows the great potential that TAS has in the field of mass transfer and scalar field of gaseous flows.<\/p>\n

Wavelength Electronics’\u00a0LDTC0520<\/a>\u00a0integrated controller provided the stable drive current and temperature control for the DFB laser ensuring high temperature accuracy and that minimal noise was added to the photodetector after TAS. Constant current to the laser delivered constant center wavelength for the tomography absorption measurements. The LDTC0520 is ideal for sensitive gaseous process characterization with low noise and stable current and temperature output.<\/p>\n<\/div>\n

Read the full case study<\/a>.<\/p>\n[\/vc_column_text][\/vc_column][vc_column width=”1\/2″][vc_single_image image=”67868″ img_size=”full” alignment=”center” onclick=”custom_link” img_link_target=”_blank” link=”http:\/\/www.teamwavelength.com\/maintenance\/download\/applicationtechnotes\/cs-ld08.pdf”][vc_column_text css=”.vc_custom_1682940716308{margin-bottom: 0px !important;}”]\n

CASE STUDY: Measuring Atomic Oxygen Densities with a THz QCL<\/a><\/em><\/h4>\n[\/vc_column_text][vc_column_text css=”.vc_custom_1682940783828{margin-bottom: 0px !important;}”]\n

Plasma applications heavily depend on atomic oxygen densities, but knowing those densities requires\u00a0<\/strong>precise and accurate diagnostic techniques. Researchers from Germany have developed the first implementation of THz QCLs for high-resolution absorption spectroscopy on plasmas, detecting absolute densities of ground state atomic oxygen at the fine structure transition at 4.75 THz. Validated with three transitions of ammonia close to this atomic oxygen line, this technique and measurement accuracy is within 5% and the detection limit is 2 \u00d7 1013<\/sup>\u00a0cm-3<\/sup>. This shows promising results for applications in plasma research that replace existing methods for measuring atomic oxygen densities with compactness without requiring calibration. Not only does this research expand the understanding of physio-chemical behavior of atomic oxygen, it also proves the diagnostic capabilities of THz absorption spectroscopy with QCLs.<\/p>\n

Measuring atomic oxygen density with high-resolution requires high precision and stable control of the quantum\u00a0cascade laser when using terahertz frequencies. Wavelength Electronics’ QCL driver,\u00a0QCL1000 OEM<\/a>, enabled precise current control with minimal electronic noise from the QCL, consistent electrical bandwidth, and laser tuning by changing the drive current.<\/p>\n

Read the full case study.<\/a><\/p>\n[\/vc_column_text][\/vc_column][vc_column][vc_empty_space height=”22px”][\/vc_column][\/vc_row][vc_row][vc_column width=”1\/6″][\/vc_column][vc_column width=”2\/3″][vc_column_text]\n

We invite you to contribute topic suggestions, questions, and general feedback. Wavelength will incorporate as much reader input as possible.
\nClick to\u00a0Submit<\/a><\/p>\n[\/vc_column_text][\/vc_column][vc_column width=”1\/6″][\/vc_column][\/vc_row][vc_row css=”.vc_custom_1507146836113{margin-top: 5px !important;background-color: #000000 !important;}”][vc_column width=”3\/4″][vc_empty_space height=”12px”][mk_fancy_title color=”#ffffff” size=”22″ force_font_size=”true” size_smallscreen=”20″ size_tablet=”18″ size_phone=”16″ txt_transform=”uppercase” margin_top=”10″ font_family=”none”]Subscribe to our newsletter for tips, techniques & product updates.[\/mk_fancy_title][\/vc_column][vc_column width=”1\/4″][mk_button dimension=”flat” corner_style=”rounded” size=”medium” url=”http:\/\/teamwavelength.us4.list-manage.com\/subscribe?u=e683bb028455c6da2682e79a6&id=cb59ea9375″ target=”_blank” align=”center” margin_top=”15″]Subscribe [\/mk_button][\/vc_column][\/vc_row][vc_row][vc_column][\/vc_column][\/vc_row]\n<\/div>","protected":false},"excerpt":{"rendered":"

[vc_row][vc_column][vc_single_image image=”67865″ img_size=”full” alignment=”center”][\/vc_column][\/vc_row][vc_row][vc_column width=”1\/2″][vc_column_text css=”.vc_custom_1682940817585{margin-bottom: 0px !important;}”] CASE STUDY: High-Definition Video Broadcasting with QCLs Free-space communications can overcome the logistical difficulties of broadband connections in remote or rural areas. By using long wave infrared (LWIR) quantum cascade lasers (QCLs) as optical sources, high data rates can be transmitted error-free, eliminating the need for physical […]<\/p>\n","protected":false},"author":8,"featured_media":0,"parent":1849,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-67864","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.teamwavelength.com\/maintenance\/wp-json\/wp\/v2\/pages\/67864","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.teamwavelength.com\/maintenance\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.teamwavelength.com\/maintenance\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.teamwavelength.com\/maintenance\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/www.teamwavelength.com\/maintenance\/wp-json\/wp\/v2\/comments?post=67864"}],"version-history":[{"count":4,"href":"https:\/\/www.teamwavelength.com\/maintenance\/wp-json\/wp\/v2\/pages\/67864\/revisions"}],"predecessor-version":[{"id":67872,"href":"https:\/\/www.teamwavelength.com\/maintenance\/wp-json\/wp\/v2\/pages\/67864\/revisions\/67872"}],"up":[{"embeddable":true,"href":"https:\/\/www.teamwavelength.com\/maintenance\/wp-json\/wp\/v2\/pages\/1849"}],"wp:attachment":[{"href":"https:\/\/www.teamwavelength.com\/maintenance\/wp-json\/wp\/v2\/media?parent=67864"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}