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? a. a.The etalon has an adjustable spacing between the two parallel surfaces. b. b.The interferometer has an adjustable spacing between the two parallel surfaces.

3. Reading Quiz Increasing the coefficient of Finesse F will a. a.Make the peaks of a Fabry-Perot interferometer sharper b. b.Make the peaks of a Fabry-Perot interferometer more blurry c. c.Change the spacing of the peaks d. d.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)? a. a.Angle going through the etalon/interferometer b. b.Diameter of the light beam c. c.Spacing between the partial reflectors d. d.Wavelength of the light

5. Symmetric case material 0 = material 2

6. Plots of T 02 Fig. 4.7Fig. 4.9  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: a. a.very high reflectivity b. b.very low reflectivity

9. Fig. 4.10 Fig. 4.11  changed by changing   Fig. 4.12

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

11. Reading Quiz The maximum  that can be accurately measured is called the free _______ range. a. a.band b. b.experiment c. c.resolution d. d.spectral e. e.wavelength

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