{"id":181,"date":"2025-06-01T10:33:58","date_gmt":"2025-06-01T07:03:58","guid":{"rendered":"http:\/\/asgarzade.sitedar.com\/faradidadak3\/en\/?post_type=product&p=181"},"modified":"2025-06-01T10:33:58","modified_gmt":"2025-06-01T07:03:58","slug":"polarizan-microscope","status":"publish","type":"product","link":"https:\/\/adakholding.ir\/en\/product\/polarizan-microscope\/","title":{"rendered":"Polarizan Microscope"},"content":{"rendered":"

POL Series:<\/strong><\/h3>\n

Polarized light microscopy is an optical microscopy technique involving polarized light. Simple techniques include\u00a0illumination of the sample with polarized light. Directly transmitted or incident light can, optionally, be blocked with a\u00a0polariser orientated at 90 degrees to the illumination.\u00a0These illumination techniques are most commonly used on birefringent samples where the polarized light interacts\u00a0strongly with the sample and so generating contrast with the background. Polarized light microscopy is used extensively in\u00a0optical mineralogy.
\nAs polarised light passes through a birefringent sample, the phase difference between the fast and slow directions varies\u00a0with the thickness, and wavelength of light used. The optical path difference (o.p.d.) is defined as<\/p>\n

o . p . d . = \u0394 n x t<\/p>\n

where t is the thickness of the sample.
\nThis then leads to a phase difference between the light passing in the two vibration directions of<\/p>\n

\u03b4 = 2 \u03c0 ( \u0394 n x t \/ \u03bb )<\/p>\n

For example, if the optical path difference is \u03bb \/ 2 , then the phase difference will be \u03c0 , and so the polarisation will be\u00a0perpendicular to the original, resulting in all of the light passing through the analyser for crossed polars.\u00a0If the optical path difference is n x \u03bb, then the phase difference will be 2 n x \u03c0 , and so the polarisation will be parallel to\u00a0the original. This means that no light will be able to pass through the analyser which it is now perpendicular to.\u00a0The Michel-Levy Chart arises when polarised white light is passed through a birefringent sample. If the sample is of\u00a0uniform thickness, then only one specific wavelength will meet the above condition described above, and be perpendicular\u00a0to the direction of the analyser. This means that instead of polychromatic light being viewed at the analyser, one specific\u00a0wavelength will have been removed. This information can be used in a number of ways:
\n\u2013 If the birefringence is known, then the thickness, t, of the sample can be determined
\n\u2013 If the thickness is known, then the birefringence of the sample can be determined
\nAs the order of the optical path difference increases, then it is more likely that more wavelengths of light will be removed\u00a0from the spectrum. This results in the appearance of the colour being \u201cwashed out\u201d, and it becomes more difficult to\u00a0determine the properties of the sample. This, however, only occurs when the sample is relatively thick when compared to\u00a0the wavelength of light<\/p>\n","protected":false},"excerpt":{"rendered":"

POL Series: Polarized light microscopy is an optical microscopy technique involving polarized light. Simple techniques include\u00a0illumination of the sample with […]<\/p>\n","protected":false},"featured_media":182,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[20],"product_tag":[],"class_list":{"0":"post-181","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-optika","8":"first","9":"instock","10":"shipping-taxable","11":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/adakholding.ir\/en\/wp-json\/wp\/v2\/product\/181","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/adakholding.ir\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/adakholding.ir\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/adakholding.ir\/en\/wp-json\/wp\/v2\/comments?post=181"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/adakholding.ir\/en\/wp-json\/wp\/v2\/media\/182"}],"wp:attachment":[{"href":"https:\/\/adakholding.ir\/en\/wp-json\/wp\/v2\/media?parent=181"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/adakholding.ir\/en\/wp-json\/wp\/v2\/product_brand?post=181"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/adakholding.ir\/en\/wp-json\/wp\/v2\/product_cat?post=181"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/adakholding.ir\/en\/wp-json\/wp\/v2\/product_tag?post=181"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}