{"id":4305,"date":"2023-09-21T12:57:54","date_gmt":"2023-09-21T12:57:54","guid":{"rendered":"https:\/\/etaoptics.com\/?post_type=product&#038;p=4305"},"modified":"2023-09-21T13:03:26","modified_gmt":"2023-09-21T13:03:26","slug":"dcv021-uncoated-double-concave-lenses-h-k9l-n-sf11-optical-glass-d12-70mm","status":"publish","type":"product","link":"https:\/\/www.etaoptics.com\/fr\/product\/dcv021-uncoated-double-concave-lenses-h-k9l-n-sf11-optical-glass-d12-70mm\/","title":{"rendered":"DCV021, Uncoated Double-Concave Lenses, H-K9L\/N-SF11 Optical Glass, D=12.70mm"},"content":{"rendered":"<div id=\"footable_parent_4304\"\n         class=\" footable_parent ninja_table_wrapper loading_ninja_table wp_table_data_press_parent semantic_ui \">\n                <table data-ninja_table_instance=\"ninja_table_instance_0\" data-footable_id=\"4304\" data-filter-delay=\"1000\" aria-label=\"Parameters of DCV021\"            id=\"footable_4304\"\n           data-unique_identifier=\"ninja_table_unique_id_141312499_4304\"\n           class=\" foo-table ninja_footable foo_table_4304 ninja_table_unique_id_141312499_4304 ui table  nt_type_legacy_table selectable celled striped vertical_centered  footable-paging-right ninja_table_search_disabled ninja_table_pro\">\n                <colgroup>\n                            <col class=\"ninja_column_0 \">\n                            <col class=\"ninja_column_1 \">\n                            <col class=\"ninja_column_2 \">\n                            <col class=\"ninja_column_3 \">\n                            <col class=\"ninja_column_4 \">\n                            <col class=\"ninja_column_5 \">\n                            <col class=\"ninja_column_6 \">\n                            <col class=\"ninja_column_7 \">\n                    <\/colgroup>\n        <thead>\n<tr class=\"footable-header\">\n                                                                                                                                        <th scope=\"col\"  class=\"ninja_column_0 ninja_clmn_nm_code \">Code<\/th><th scope=\"col\"  class=\"ninja_column_1 ninja_clmn_nm_material \">Material<\/th><th scope=\"col\"  class=\"ninja_column_2 ninja_clmn_nm_ar_coating \">AR Coating<\/th><th scope=\"col\"  class=\"ninja_column_3 ninja_clmn_nm_diameter \">Diameter-mm<\/th><th scope=\"col\"  class=\"ninja_column_4 ninja_clmn_nm_focal_length_efl \">Focal Length (EFL-mm)<\/th><th scope=\"col\"  class=\"ninja_column_5 ninja_clmn_nm_radius_of_curvature_r \">Radius of Curvature (R1-mm)<\/th><th scope=\"col\"  class=\"ninja_column_6 ninja_clmn_nm_center_thickness_tc \">Center Thickness (Tc-mm)<\/th><th scope=\"col\"  class=\"ninja_column_7 ninja_clmn_nm_edge_thickness_te \">Edge Thickness (Te-mm)<\/th><\/tr>\n<\/thead>\n<tbody>\n\n        <tr data-row_id=\"2127\" class=\"ninja_table_row_0 nt_row_id_2127\">\n            <td>DCV021-01<\/td><td>H-K9L (BK7)<\/td><td>Uncoated<\/td><td>12.7<\/td><td>-25.0<\/td><td>-26.17<\/td><td>2.5<\/td><td>4.1<\/td>        <\/tr>\n            <tr data-row_id=\"2128\" class=\"ninja_table_row_1 nt_row_id_2128\">\n            <td>DCV021-02<\/td><td>H-K9L (BK7)<\/td><td>Uncoated<\/td><td>12.7<\/td><td>-30.0<\/td><td>-31.41<\/td><td>3.0<\/td><td>4.3<\/td>        <\/tr>\n            <tr data-row_id=\"2129\" class=\"ninja_table_row_2 nt_row_id_2129\">\n            <td>DCV021-03<\/td><td>H-K9L (BK7)<\/td><td>Uncoated<\/td><td>12.7<\/td><td>-50.0<\/td><td>-52.10<\/td><td>3.5<\/td><td>4.3<\/td>        <\/tr>\n    <\/tbody><!--ninja_tobody_rendering_done-->\n    <\/table>\n    \n    \n    \n<\/div>\n\n\n\t<section class=\"section\" id=\"section_1877316198\">\n\t\t<div class=\"section-bg fill\" >\n\t\t\t\t\t\t\t\t\t\n\t\t\t\n\n\t\t<\/div>\n\n\t\t\n\n\t\t<div class=\"section-content relative\">\n\t\t\t\n\n<div class=\"row align-middle\"  id=\"row-2122823586\">\n\n\n\t<div id=\"col-987966021\" class=\"col medium-6 small-12 large-6\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\n<h3>Uncoated Double-Concave Lenses<\/h3>\n<p>These uncoated Plano-Concave Lenses are made of BK7 (N-BK7) or N-SF11.<\/p>\n<p>Since the Abbe number of N-SF11 (25.76) is smaller than the Abbe number of N-BK7 (64.17), the lens made of N-SF11 exhibits greater dispersion than the lens made of N-BK7.<\/p>\n<ul>\n<li>N-BK7: 350-2000nm<\/li>\n<li>N-SF11: 420-2300nm<\/li>\n<\/ul>\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-527814407\" class=\"col medium-6 small-12 large-6\"  >\n\t\t\t\t<div class=\"col-inner box-shadow-3\"  >\n\t\t\t\n\t\t\t\n\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_1630005547\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"587\" height=\"356\" src=\"https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/DCV3.png\" class=\"attachment-large size-large\" alt=\"\" srcset=\"https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/DCV3.png 587w, https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/DCV3-300x182.png 300w\" sizes=\"auto, (max-width: 587px) 100vw, 587px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_1630005547 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n<\/div>\n\n\t\t<\/div>\n\n\t\t\n<style>\n#section_1877316198 {\n  padding-top: 30px;\n  padding-bottom: 30px;\n}\n<\/style>\n\t<\/section>\n\t\n\n\t<section class=\"section\" id=\"section_912163789\">\n\t\t<div class=\"section-bg fill\" >\n\t\t\t\t\t\t\t\t\t\n\t\t\t\n\n\t\t<\/div>\n\n\t\t\n\n\t\t<div class=\"section-content relative\">\n\t\t\t\n\n<div class=\"row align-middle align-center\"  id=\"row-222112038\">\n\n\n\t<div id=\"col-98060349\" class=\"col medium-6 small-12 large-6\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_503642620\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner box-shadow-3 dark\" >\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1020\" height=\"531\" src=\"https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/DCV-GLa-1024x533.png\" class=\"attachment-large size-large\" alt=\"\" srcset=\"https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/DCV-GLa-1024x533.png 1024w, https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/DCV-GLa-300x156.png 300w, https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/DCV-GLa-768x400.png 768w, https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/DCV-GLa-600x313.png 600w, https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/DCV-GLa.png 1288w\" sizes=\"auto, (max-width: 1020px) 100vw, 1020px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_503642620 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1937018418\" class=\"col medium-6 small-12 large-6\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\n<div class=\"row\"  id=\"row-2138780336\">\n\n\n\t<div id=\"col-2032316693\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\n<p>Double-Concave Lenses are made of two concave surfaces with same radius, usually used in beam expansion applications, light projection, or focal length of expansion.<\/p>\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n<\/div>\n<div class=\"row\"  id=\"row-411519407\">\n\n\n\t<div id=\"col-517693140\" class=\"col medium-6 small-12 large-6\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\n<p>Tc---------- Center Thickness<br \/>\nTe---------- Edge Thickness<br \/>\nR1---------- Radius<br \/>\nDia---------- Diameter<\/p>\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1290058338\" class=\"col medium-6 small-12 large-6\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\n<p>BFL ---------- Back Focal Length<br \/>\nEFL ---------- Effective Focal Length<br \/>\nH'-------------- Principal Point<\/p>\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n<\/div>\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n\n<style>\n#row-222112038 > .col > .col-inner {\n  padding: 20px 0px 0px 0px;\n}\n<\/style>\n<\/div>\n<div class=\"row\"  id=\"row-691832041\">\n\n\n\t<div id=\"col-1348618508\" class=\"col medium-6 small-12 large-6\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\n<p><div id=\"footable_parent_3201\"\n         class=\" footable_parent ninja_table_wrapper loading_ninja_table wp_table_data_press_parent semantic_ui \">\n                <table data-ninja_table_instance=\"ninja_table_instance_1\" data-footable_id=\"3201\" data-filter-delay=\"1000\" aria-label=\"Technical Specifications of Uncoated Double-Convex Lenses-1\"            id=\"footable_3201\"\n           data-unique_identifier=\"ninja_table_unique_id_74145385_3201\"\n           class=\" foo-table ninja_footable foo_table_3201 ninja_table_unique_id_74145385_3201 ui table  nt_type_legacy_table selectable striped vertical_centered  footable-paging-right ninjatable_hide_header_row ninja_table_search_disabled ninja_table_pro\">\n                <colgroup>\n                            <col class=\"ninja_column_0 \">\n                            <col class=\"ninja_column_1 \">\n                    <\/colgroup>\n        <thead>\n<tr class=\"footable-header\">\n                                        <th scope=\"col\"  class=\"ninja_column_0 ninja_clmn_nm_1 \">1<\/th><th scope=\"col\"  class=\"ninja_column_1 ninja_clmn_nm_2 \">2<\/th><\/tr>\n<\/thead>\n<tbody>\n\n        <tr data-row_id=\"1350\" class=\"ninja_table_row_0 nt_row_id_1350\">\n            <td>Material<\/td><td>H-K9L<\/td>        <\/tr>\n            <tr data-row_id=\"1351\" class=\"ninja_table_row_1 nt_row_id_1351\">\n            <td>Thickness Tolerance<\/td><td>\u00b10.1mm<\/td>        <\/tr>\n            <tr data-row_id=\"1352\" class=\"ninja_table_row_2 nt_row_id_1352\">\n            <td>Surface Accuracy<\/td><td>\u03bb\/4 @632.8nm<\/td>        <\/tr>\n            <tr data-row_id=\"1353\" class=\"ninja_table_row_3 nt_row_id_1353\">\n            <td>Centering Tolerance<\/td><td><3 arcmin<\/td>        <\/tr>\n            <tr data-row_id=\"1354\" class=\"ninja_table_row_4 nt_row_id_1354\">\n            <td>Bevelling<\/td><td><0.2\u00d745\u00b0<\/td>        <\/tr>\n    <\/tbody><!--ninja_tobody_rendering_done-->\n    <\/table>\n    \n    \n    \n<\/div>\n<\/p>\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-982026123\" class=\"col medium-6 small-12 large-6\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\n<p><div id=\"footable_parent_3200\"\n         class=\" footable_parent ninja_table_wrapper loading_ninja_table wp_table_data_press_parent semantic_ui \">\n                <table data-ninja_table_instance=\"ninja_table_instance_2\" data-footable_id=\"3200\" data-filter-delay=\"1000\" aria-label=\"Technical Specifications of Uncoated Double-Convex Lenses-2\"            id=\"footable_3200\"\n           data-unique_identifier=\"ninja_table_unique_id_1174342576_3200\"\n           class=\" foo-table ninja_footable foo_table_3200 ninja_table_unique_id_1174342576_3200 ui table  nt_type_legacy_table selectable striped vertical_centered  footable-paging-right ninjatable_hide_header_row ninja_table_search_disabled ninja_table_pro\">\n                <colgroup>\n                            <col class=\"ninja_column_0 \">\n                            <col class=\"ninja_column_1 \">\n                    <\/colgroup>\n        <thead>\n<tr class=\"footable-header\">\n                                        <th scope=\"col\"  class=\"ninja_column_0 ninja_clmn_nm_1 \">1<\/th><th scope=\"col\"  class=\"ninja_column_1 ninja_clmn_nm_2 \">2<\/th><\/tr>\n<\/thead>\n<tbody>\n\n        <tr data-row_id=\"1342\" class=\"ninja_table_row_0 nt_row_id_1342\">\n            <td>Design Wavelength<\/td><td>632.8nm<\/td>        <\/tr>\n            <tr data-row_id=\"1343\" class=\"ninja_table_row_1 nt_row_id_1343\">\n            <td>Focal Length Tolerance<\/td><td>\u00b11%<\/td>        <\/tr>\n            <tr data-row_id=\"1344\" class=\"ninja_table_row_2 nt_row_id_1344\">\n            <td>Diameter Tolerance<\/td><td>+0.0\/-0.1mm<\/td>        <\/tr>\n            <tr data-row_id=\"1345\" class=\"ninja_table_row_3 nt_row_id_1345\">\n            <td>Surface Quality<\/td><td>40-20<\/td>        <\/tr>\n            <tr data-row_id=\"1346\" class=\"ninja_table_row_4 nt_row_id_1346\">\n            <td>Clear Apperture<\/td><td>>90%<\/td>        <\/tr>\n    <\/tbody><!--ninja_tobody_rendering_done-->\n    <\/table>\n    \n    \n    \n<\/div>\n<\/p>\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n<\/div>\n<div class=\"row align-middle\"  id=\"row-606485466\">\n\n\n\t<div id=\"col-1850759723\" class=\"col medium-6 small-12 large-6\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\n<p>The focal length of the Double-concave lens is negative, which is the best choice for diverging convergent beam.<\/p>\n<p>Similar to Plano-concave lenses, Double-concave lenses can spread a parallel beam to the virtual focus, as in a Galilean beam expander.<\/p>\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-646906186\" class=\"col medium-6 small-12 large-6\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\n<p>Double-Concave Lenses can also be coated with AR Coating<\/p>\n<ul>\n<li>-A: AR@350-700nm,<\/li>\n<li>-B: AR@650-1100nm,<\/li>\n<li>-C: AR@1050-1700nm,<\/li>\n<\/ul>\n<p>anti-reflection coating can reduce the reflectivity of each surface of the lens.<\/p>\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n\n<\/div>\n<div class=\"row\"  id=\"row-1215679519\">\n\n\n\t<div id=\"col-444841765\" class=\"col medium-6 small-12 large-6\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\n\t<div class=\"box has-hover   has-hover box-text-bottom\" >\n\n\t\t<div class=\"box-image\" >\n\t\t\t\t\t\t<div class=\"\" >\n\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"784\" height=\"481\" src=\"https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/Uncoated-N-BK7-10mm-Thick-Sample.png\" class=\"attachment- size-\" alt=\"Uncoated-N-BK7-(10mm-Thick-Sample)\" srcset=\"https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/Uncoated-N-BK7-10mm-Thick-Sample.png 784w, https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/Uncoated-N-BK7-10mm-Thick-Sample-300x184.png 300w, https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/Uncoated-N-BK7-10mm-Thick-Sample-768x471.png 768w, https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/Uncoated-N-BK7-10mm-Thick-Sample-600x368.png 600w\" sizes=\"auto, (max-width: 784px) 100vw, 784px\" \/>\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\t<div class=\"box-text text-center\" >\n\t\t\t<div class=\"box-text-inner\">\n\t\t\t\t\n\n<h4>Uncoated-N-BK7 (10mm Thick Sample)<\/h4>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\t\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-69614081\" class=\"col medium-6 small-12 large-6\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\n\t<div class=\"box has-hover   has-hover box-text-bottom\" >\n\n\t\t<div class=\"box-image\" >\n\t\t\t\t\t\t<div class=\"\" >\n\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"784\" height=\"481\" src=\"https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/Uncoated-N-SF11-10mm-Thick-Sample.png\" class=\"attachment- size-\" alt=\"Uncoated-N-SF11-(10mm-Thick-Sample)\" srcset=\"https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/Uncoated-N-SF11-10mm-Thick-Sample.png 784w, https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/Uncoated-N-SF11-10mm-Thick-Sample-300x184.png 300w, https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/Uncoated-N-SF11-10mm-Thick-Sample-768x471.png 768w, https:\/\/www.etaoptics.com\/wp-content\/uploads\/2023\/09\/Uncoated-N-SF11-10mm-Thick-Sample-600x368.png 600w\" sizes=\"auto, (max-width: 784px) 100vw, 784px\" \/>\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\t<div class=\"box-text text-center\" >\n\t\t\t<div class=\"box-text-inner\">\n\t\t\t\t\n\n<h4>Uncoated N-SF11 (10mm Thick Sample)<\/h4>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\t\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n<\/div>\n\n\t\t<\/div>\n\n\t\t\n<style>\n#section_912163789 {\n  padding-top: 30px;\n  padding-bottom: 30px;\n  background-color: rgba(248, 248, 248, 0.669);\n}\n<\/style>\n\t<\/section>\n\t\n","protected":false},"excerpt":{"rendered":"<ul>\n<li>DCV021, Uncoated Double-Concave Lenses, which are available in two materials: N-BK7 and N-SF11.<\/li>\n<li>This Plano-concave lens with a diameter of 12.70mm, has different focal lengths for you to choose from, f-25mm, f-30mm, f-50mm.<\/li>\n<\/ul>\n","protected":false},"featured_media":4257,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[37,41,74,78],"product_tag":[],"class_list":{"0":"post-4305","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-lenses","7":"product_cat-double-concave-dcv-lenses","8":"product_cat-h-k9l-double-concave-lenses","9":"product_cat-uncoated-350-2000nm-h-k9l-double-concave-lenses","11":"first","12":"instock","13":"shipping-taxable","14":"purchasable","15":"product-type-variable"},"_links":{"self":[{"href":"https:\/\/www.etaoptics.com\/fr\/wp-json\/wp\/v2\/product\/4305","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.etaoptics.com\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.etaoptics.com\/fr\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.etaoptics.com\/fr\/wp-json\/wp\/v2\/comments?post=4305"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.etaoptics.com\/fr\/wp-json\/wp\/v2\/media\/4257"}],"wp:attachment":[{"href":"https:\/\/www.etaoptics.com\/fr\/wp-json\/wp\/v2\/media?parent=4305"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.etaoptics.com\/fr\/wp-json\/wp\/v2\/product_brand?post=4305"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.etaoptics.com\/fr\/wp-json\/wp\/v2\/product_cat?post=4305"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.etaoptics.com\/fr\/wp-json\/wp\/v2\/product_tag?post=4305"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}