1. Announcements 11/22/10 Prayer No office hours tomorrow (neither TA nor I), even though we do have class. Exam 3 starts Tuesday after the break. Lab 10 (final lab) going on right now. Due the Tuesday after the break.

2. Reading quiz Which of the following is NOT true of the wave vector? a. a.Its magnitude is equal to 2  /. b. b.In a plane wave it points in the same direction everywhere in space. c. c.In a spherical wave it points in the same direction everywhere in space. d. d.It tells us which way the wave is going. e. e.In one dimension it reduces to the wave number k.

3. Waves in 3-dimensions Plane waves a. a.polarization Wave vector a. a.direction of wave Spherical waves

4. Student-designed problem What direction do you want the wave to be traveling in? What direction do you want the wave to be oscillating in? What wavelength do you want the wave to have? What do you want the wave’s amplitude to be? What frequency (or velocity) do you want the wave to have? What do you want the overall phase of the wave to be?

5. Lasers What makes a laser special? (answers from class) Some of my answers: a. a.Single wavelength b. b.Intense c. c.Collimated d. d.Coherence (spatial, temporal) - 99.9999999999% Actual laser spectrum over 100  narrower than the width of the red line Blackbody spectrum Laser spectrum

6. Lasers Principal components: 1. Gain medium 2. Laser pumping energy 3. High reflector 4. Output coupler 5. Laser beam Energy (light, electrical, etc.) AbsorptionEmission light Stimulated Emission Image & list from Wikipedia Energy (light only)

7. More Wikipedia Green laser pointer 1. Gain medium 2. Laser pumping energy 3. High reflector 4. Output coupler 5. Laser beam

8. More Wikipedia

9. Circular Polarization Pictures from Wikipedia Remember these pictures?

10. Optical Retarders, aka “Wave plates” Quartz, SiO 2 : n o = 1.544, n e = 1.553 Calcite, CaCO 3 : n o = 1.658, n e = 1.486 Pictures from Wikipedia Calcite crystal:

11. Optical Modulators Electro-optic modulator Acousto-optic modulator AOM EOM www.newport.comwikipedia Field changes vertical index of refraction

12. That’s All! (for optics) Survey (right now) about exam 3 review session times for Monday next week