{"id":269,"date":"2023-04-16T05:56:45","date_gmt":"2023-04-16T05:56:45","guid":{"rendered":"https:\/\/web.htk.tlu.ee\/stem\/stem2\/?post_type=chapter&p=269"},"modified":"2023-05-23T02:31:10","modified_gmt":"2023-05-23T02:31:10","slug":"unit-2-applications-of-different-interferometer-types","status":"publish","type":"chapter","link":"https:\/\/web.htk.tlu.ee\/stem\/stem2\/chapter\/unit-2-applications-of-different-interferometer-types\/","title":{"rendered":"Unit 2: Applications of different Interferometer Types"},"content":{"raw":"

2.1 How an Interferometer works<\/h1>\r\nVery small changes in length can be measured with a Michelson interferometer. For this purpose, a coherent light beam is split into two partial beams at a beam splitter. The two partial beams run on perpendicular paths to one mirror each. There they are reflected and directed via the beam splitter onto a screen. There, the two partial beams interfere with each other and create an interference pattern.\r\n

Task 2.1<\/h2>\r\nMatch the technical terms to the components of the Michelson interferometer in the diagram.\r\n
\r\n
[h5p id=\"23\"]<\/code><\/div>\r\n
\r\n\r\nFigure 1:<\/strong> \u00a0Basic design of a Michelson interferometer<\/em>\r\n\r\n<\/div>\r\n<\/div>\r\n

Task 2.2<\/h2>\r\n[h5p id=\"24\"]<\/span>\r\n

Task 2.3<\/h2>\r\nUse the following worksheet to familiarize yourself with how a Michelson interferometer works.\r\n\r\n\"\"<\/a>\r\n

2.2: Determining the wavelength of the laser<\/h1>\r\nIn figure 1, mirror 1 is initially in position 1. Constructive interference occurs on the screen. Now mirror M1 is slowly moved to position 2. Constructive interference occurs again at n mirror positions on the screen, including position 2. The following relationship applies to the displacement of the mirror and the wavelength of the laser:\r\n

[latex]\\Delta\\text{x}=n\\cdot \\frac{\\lambda}{2}[\/latex]<\/p>\r\n\r\n

Task 2.4<\/h2>\r\n
\r\n
[h5p id=\"25\"]<\/code><\/div>\r\n<\/div>\r\n

Task 2.5<\/strong><\/h2>\r\nUse the following interactive screen experiment to determine the wavelength of the laser used there.\r\n\r\nInteractice Screen Experiment<\/a>\r\n\r\nProceed as follows for this purpose:\r\n
    \r\n \t
  1. Click on \u201cVersuch 1\".<\/li>\r\n \t
  2. Switch on the laser.<\/li>\r\n \t
  3. The green interference pattern shows a black dot in the middle.<\/li>\r\n \t
  4. Click on the magnifying glass. The micrometer screw becomes visible.<\/li>\r\n \t
  5. Click on the arrows to adjust the micrometer screw.<\/li>\r\n \t
  6. Turn the micrometer screw until n <\/em>= 20 more black dots have appeared on the interference pattern.<\/li>\r\n \t
  7. Read off the micrometer scale (measured in 10-6 m) the distance by which the mirror has been moved (\u0394x<\/em>).<\/li>\r\n<\/ol>\r\nDetermine the wavelength of the laser light using the following formula:\r\n\r\n[latex]\\Delta\\text{x}=n\\cdot \\frac{\\lambda}{2}[\/latex]\r\n

    Task\u00a02.6<\/h2>\r\nNow you know how a Michelson interferometer works. To secure this knowledge, now watch the following silent video and describe the physical processes in your own words. <\/span>The source used here is not laser light, but ultrasound waves.\r\n\r\nSilent Video:\r\n\r\n[embed]https:\/\/youtu.be\/pFWBfaM1OPU[\/embed]\r\n

    <\/h2>","rendered":"

    2.1 How an Interferometer works<\/h1>\n

    Very small changes in length can be measured with a Michelson interferometer. For this purpose, a coherent light beam is split into two partial beams at a beam splitter. The two partial beams run on perpendicular paths to one mirror each. There they are reflected and directed via the beam splitter onto a screen. There, the two partial beams interfere with each other and create an interference pattern.<\/p>\n

    Task 2.1<\/h2>\n

    Match the technical terms to the components of the Michelson interferometer in the diagram.<\/p>\n

    \n
    <\/p>\n
    \n