Northwestern Üniversitesinde geliştirilen yeni rezonatörün parlak, güçlü tek modlu 8-12 mikron mertebesinde kuantum kaskad lazer oluşturduğu iddia ediliyor.

Uzaktan algılama uygulamaları, lazer kaynaklarının yüksek güçlü, tek modlu olmasının yanı sıra, iyi ışın kalitesini gerektiriyor. Hepsini bir arada toplayan bu cihaz, endüstrinin yanı sıra 8-12 mikron mertebesinde olduğu için askeri uygulamlar için de cazip.

Manijeh Razeghi, Northwestern Üniversitesinin McCormick Mühendislik ve Uygulamalı Bilimler Okulu’nda elektrik mühendisliği ve bilgisayar bilimi profesörü ve Quantum Cihazları Merkezi’nin yöneticisi. Ekibiyle, hem dalga boyunun hem de ışın kalitesinin kontrol edebildiği bu yeni lazer teknolojisini geliştiren Razeghi, yeni tip B-DFB adında bir geri besleme mekanizması kullandıklarını söylüyor. Bu mekanizma, açılı lazer kavitesinde kırınımlayıcı geri besleme yapıyor.

 

Razeghi, ‘Rezonatörümüz, yüksek güçlü, iyi ışın kalitesine sahip, tek modlu lazer kaynakları arasında en fazla gelecek vaadedeni. Ayrıca pahalı bir uygulama değil ve oda sıcaklığında uygulanabiliyor. Bunun ötesinde söz konusu tasarım, herhangi bir dalga boyundaki pek çok yarı iletken lazere de uygulanabiliyor.” diyor.’



Razeghi ve grubu, cihazın demosunu 6W üzerinde pik gücü ve 10.4 mikron dalga boyunda (10 mikron dalga boyunun üzerinde demosu yapılan en yüksek güçlü tek modlu yarı iletken lazer) neredeyse kırınımsız ışın kalitesi ile yapmışlar.

Tasarımın geliştirilmesi için öncelikle laser kavitesinin optimizasyonu üzerinde çalışılacak ve çıkış gücünün daha da arttırılması hedefleniyor.

Bulgular üzerine yazılan makale ‘Angled Cavity Broad Area Quantum Cascade Lasers’, 21 Ağustos’ta Applied Physics Letters’da yayınlandı.



Northwestern Üniversitesinde geliştirilen yeni rezonatörün parlak, güçlü tek modlu 8-12 mikron mertebesinde kuantum kaskad lazer oluşturduğu iddia ediliyor.

Uzaktan algılama uygulamaları, lazer kaynaklarının yüksek güçlü, tek modlu olmasının yanı sıra, iyi ışın kalitesini gerektiriyor. Hepsini bir arada toplayan bu cihaz, endüstrinin yanı sıra 8-12 mikron mertebesinde olduğu için askeri uygulamlar için de cazip.

Manijeh Razeghi, McCormick Mühendislik ve Uygulamalı Bilimler okulu’nda elektrik mühendisliği ve bilgisayar bilimi profesörü ve Quantum Cihazları Merkezi’nin yöneticisi. Ekibiyle hem dalga boyunun hem de ışın kalitesinin kontrol edebildiği bu yeni lazer teknolojisini geliştiren Razeghi, yeni tip B-DFB adında bir geri besleme mekanizması kullandıklarını söylüyor. Bu mekanizma, açılı laser kavitesinde kırınımlayıcı geri besleme yapıyor.

Razeghi, ‘Rezonatörümüz, yüksek güçlü, iyi ışın kalitesine sahip, tek modlu lazer kaynakları arasında en fazla gelecek vaadedeni. Ayrıca pahalı bir uygulama değil ve oda sıcaklığında uygulanabiliyor. Bunun ötesinde söz konusu tasarım, herhangi bir dalga boyundaki pek çok yarı iletken lazere de uygulanabiliyor.” diyor.’



Razeghi ve grubu, cihazın demosunu 6W üzerinde pik gücü ve 10.4 mikron dalga boyunda (10 mikron dalga boyunun üzerinde demosu yapılan en yüksek güçlü tek modlu yarı iletken lazer) neredeyse kırınımsız ışın kalitesi ile yapmışlar.

Tasarımın geliştirilmesi için öncelikle laser kavitesinin optimizasyonu üzerinde çalışılacak ve çıkış gücünün daha da arttırılması hedefleniyor.

Bulgular üzerine yazılan makale ‘Angled Cavity Broad Area Quantum Cascade Lasers’, 21 Ağustos’ta Applied Physics Letters’da yayınlandı.



Resonator

 

 

 

 

 

 

 

 

Adaptasyon: http://www.theengineer.co.uk/sectors/electronics/news/resonator-creates-powerful-single-mode-laser-sources/1013681.article#ixzz24b9yuPzX

 

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  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM josdm_fields AS a LEFT JOIN `josdm_languages` AS l ON l.lang_code = a.language LEFT JOIN josdm_users AS uc ON uc.id=a.checked_out LEFT JOIN josdm_viewlevels AS ag ON ag.id = a.access LEFT JOIN josdm_users AS ua ON ua.id = a.created_user_id LEFT JOIN josdm_fields_groups AS g ON g.id = a.group_id LEFT JOIN `josdm_fields_categories` AS fc ON fc.field_id = a.id WHERE ( (`a`.`context` = :context AND (`fc`.`category_id` IS NULL OR `fc`.`category_id` IN (:preparedArray1,:preparedArray2,:preparedArray3,:preparedArray4)) AND `a`.`access` IN (:preparedArray5,:preparedArray6)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray7,:preparedArray8)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform ORDER BY a.ordering ASC820μs4.81KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:164Copy
  • SELECT `a`.`id`,`a`.`title`,`a`.`catid`,`a`.`language`, CASE WHEN CHAR_LENGTH(`a`.`alias`) != 0 THEN CONCAT_WS(':', `a`.`id`, `a`.`alias`) ELSE a.id END AS `slug`, CASE WHEN CHAR_LENGTH(`cc`.`alias`) != 0 THEN CONCAT_WS(':', `cc`.`id`, `cc`.`alias`) ELSE cc.id END AS `catslug` FROM `josdm_content` AS `a` LEFT JOIN `josdm_categories` AS `cc` ON `cc`.`id` = `a`.`catid` WHERE `a`.`catid` = :catid AND `a`.`state` = :state AND `a`.`access` IN (:preparedArray1,:preparedArray2) AND (`publish_up` IS NULL OR `publish_up` <= :nowDate1) AND (`publish_down` IS NULL OR `publish_down` >= :nowDate2) ORDER BY CASE WHEN `a`.`publish_up` IS NULL THEN `a`.`created` ELSE `a`.`publish_up` END DESC937μs2.47KBParams/plugins/content/pagenavigation/src/Extension/PageNavigation.php:205Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `josdm_categories` AS `s` INNER JOIN `josdm_categories` AS `c` ON (`s`.`lft` <= `c`.`lft` AND `c`.`lft` < `s`.`rgt`) OR (`c`.`lft` < `s`.`lft` AND `s`.`rgt` < `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`553μs3.94KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT `m`.`id`,`m`.`title`,`m`.`module`,`m`.`position`,`m`.`content`,`m`.`showtitle`,`m`.`params`,`mm`.`menuid` FROM `josdm_modules` AS `m` LEFT JOIN `josdm_modules_menu` AS `mm` ON `mm`.`moduleid` = `m`.`id` LEFT JOIN `josdm_extensions` AS `e` ON `e`.`element` = `m`.`module` AND `e`.`client_id` = `m`.`client_id` WHERE ( ( (`m`.`published` = 1 AND `e`.`enabled` = 1 AND `m`.`client_id` = :clientId AND `m`.`access` IN (:preparedArray1,:preparedArray2)) AND (`m`.`publish_up` IS NULL OR `m`.`publish_up` <= :publishUp)) AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= :publishDown)) AND (`mm`.`menuid` = :itemId OR `mm`.`menuid` <= 0) ORDER BY `m`.`position`,`m`.`ordering`1.42ms18KBParams/libraries/src/Cache/Controller/CallbackController.php:51Copy
  • SELECT `a`.`id`,`a`.`title`,`a`.`alias`,`a`.`introtext`,`a`.`fulltext`,`a`.`checked_out`,`a`.`checked_out_time`,`a`.`catid`,`a`.`created`,`a`.`created_by`,`a`.`created_by_alias`,`a`.`modified`,`a`.`modified_by`,CASE WHEN `a`.`publish_up` IS NULL THEN `a`.`created` ELSE `a`.`publish_up` END AS `publish_up`,`a`.`publish_down`,`a`.`images`,`a`.`urls`,`a`.`attribs`,`a`.`metadata`,`a`.`metakey`,`a`.`metadesc`,`a`.`access`,`a`.`hits`,`a`.`featured`,`a`.`language`,LENGTH(`a`.`fulltext`) AS `readmore`,`a`.`ordering`,`fp`.`featured_up`,`fp`.`featured_down`,CASE WHEN `c`.`published` = 2 AND `a`.`state` > 0 THEN 2 WHEN `c`.`published` != 1 THEN 0 ELSE `a`.`state` END AS `state`,`c`.`title` AS `category_title`,`c`.`path` AS `category_route`,`c`.`access` AS `category_access`,`c`.`alias` AS `category_alias`,`c`.`language` AS `category_language`,`c`.`published`,`c`.`published` AS `parents_published`,`c`.`lft`,CASE WHEN `a`.`created_by_alias` > ' ' THEN `a`.`created_by_alias` ELSE `ua`.`name` END AS `author`,`ua`.`email` AS `author_email`,`uam`.`name` AS `modified_by_name`,`parent`.`title` AS `parent_title`,`parent`.`id` AS `parent_id`,`parent`.`path` AS `parent_route`,`parent`.`alias` AS `parent_alias`,`parent`.`language` AS `parent_language` FROM `josdm_content` AS `a` LEFT JOIN `josdm_categories` AS `c` ON `c`.`id` = `a`.`catid` LEFT JOIN `josdm_users` AS `ua` ON `ua`.`id` = `a`.`created_by` LEFT JOIN `josdm_users` AS `uam` ON `uam`.`id` = `a`.`modified_by` LEFT JOIN `josdm_categories` AS `parent` ON `parent`.`id` = `c`.`parent_id` LEFT JOIN `josdm_content_frontpage` AS `fp` ON `fp`.`content_id` = `a`.`id` WHERE `a`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`access` IN (:preparedArray3,:preparedArray4) AND `c`.`published` = 1 AND `a`.`state` = :condition AND `a`.`id` <> :articleId AND `a`.`catid` IN (:preparedArray5) AND (`a`.`publish_up` IS NULL OR `a`.`publish_up` <= :publishUp) AND (`a`.`publish_down` IS NULL OR `a`.`publish_down` >= :publishDown) ORDER BY a.ordering DESC LIMIT 51.52ms39.02KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:164Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `josdm_categories` AS `s` INNER JOIN `josdm_categories` AS `c` ON (`s`.`lft` <= `c`.`lft` AND `c`.`lft` < `s`.`rgt`) OR (`c`.`lft` < `s`.`lft` AND `s`.`rgt` < `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`366μs3.95KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM josdm_fields AS a LEFT JOIN `josdm_languages` AS l ON l.lang_code = a.language LEFT JOIN josdm_users AS uc ON uc.id=a.checked_out LEFT JOIN josdm_viewlevels AS ag ON ag.id = a.access LEFT JOIN josdm_users AS ua ON ua.id = a.created_user_id LEFT JOIN josdm_fields_groups AS g ON g.id = a.group_id WHERE ( (`a`.`context` = :context AND `a`.`access` IN (:preparedArray1,:preparedArray2)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray3,:preparedArray4)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform ORDER BY a.ordering ASC590μs4.06KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:164Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `josdm_categories` AS `s` INNER JOIN `josdm_categories` AS `c` ON (`s`.`lft` <= `c`.`lft` AND `c`.`lft` < `s`.`rgt`) OR (`c`.`lft` < `s`.`lft` AND `s`.`rgt` < `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`372μs3.95KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM josdm_fields AS a LEFT JOIN `josdm_languages` AS l ON l.lang_code = a.language LEFT JOIN josdm_users AS uc ON uc.id=a.checked_out LEFT JOIN josdm_viewlevels AS ag ON ag.id = a.access LEFT JOIN josdm_users AS ua ON ua.id = a.created_user_id LEFT JOIN josdm_fields_groups AS g ON g.id = a.group_id LEFT JOIN `josdm_fields_categories` AS fc ON fc.field_id = a.id WHERE ( (`a`.`context` = :context AND (`fc`.`category_id` IS NULL OR `fc`.`category_id` IN (:preparedArray1,:preparedArray2,:preparedArray3,:preparedArray4,:preparedArray5)) AND `a`.`access` IN (:preparedArray6,:preparedArray7)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray8,:preparedArray9)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform ORDER BY a.ordering ASC511μs4.81KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:164Copy
  • SELECT `alias`,`catid` FROM josdm_content WHERE `id` = :key107μs1.37KBParams/libraries/src/Component/Router/Rules/PreprocessRules.php:123Copy
  • SELECT SUM(CASE WHEN `a`.`next_execution` <= :now THEN 1 ELSE 0 END) AS due_count,SUM(CASE WHEN `a`.`locked` IS NULL THEN 0 ELSE 1 END) AS locked_count FROM `josdm_scheduler_tasks` AS `a` WHERE `a`.`state` = 1235μs1.37KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:517Copy
  • SELECT `session_id` FROM `josdm_session` WHERE `session_id` = ?101μs3.5KBParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:277Copy
  • UPDATE `josdm_session` SET `data` = ? , `time` = ? WHERE `session_id` = ?234μs592BParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:301Copy