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Announcements 2/1/12

Announcements 2/1/12. Prayer Exam 1 review sheet Schedule adjustment. Reading Quiz. What is the difference between a Fabry-Perot etalon and a Fabry-Perot interferometer ? The etalon has an adjustable spacing between the two parallel surfaces.

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Announcements 2/1/12

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  1. Announcements 2/1/12 • Prayer • Exam 1 review sheet • Schedule adjustment

  2. Reading Quiz • What is the difference between a Fabry-Perot etalon and a Fabry-Perot interferometer? • The etalon has an adjustable spacing between the two parallel surfaces. • The interferometer has an adjustable spacing between the two parallel surfaces.

  3. Reading Quiz • Increasing the coefficient of Finesse F will • Make the peaks of a Fabry-Perot interferometer sharper • Make the peaks of a Fabry-Perot interferometer more blurry • Change the spacing of the peaks • Do nothing to the peaks

  4. Reading Quiz • Which of the following was not mentioned in the book as something that could be varied to allow you to see Fabry-Perot fringes (transmission peaks)? • Angle going through the etalon/interferometer • Diameter of the light beam • Spacing between the partial reflectors • Wavelength of the light

  5. Symmetric case • material 0 = material 2

  6. Plots of T02 Fig. 4.7 Fig. 4.9 F changed by changing d

  7. How wide is the peak?

  8. Thought question (not graded) • Suppose you want to make your transmission peak as tall and narrow as possible. You should choose partial reflectors with: • very high reflectivity • very low reflectivity

  9. F changed by changing q1 Fig. 4.11 Fig. 4.10 Fig. 4.12

  10. F changed by changing l Fig. 4.13 Two nearby wave-lengths sent through simultaneously. Fig. 4.14

  11. Reading Quiz • The maximum Dl that can be accurately measured is called the free _______ range. • band • experiment • resolution • spectral • wavelength

  12. Odds and ends: when used for wavelengths… • Width of peak: lFWHM • Separation between peaks: DlFSR • “Resolving power”: RP • “Reflecting finesse”, or “finesse”: f (not same as “coefficient of finesse” F )

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