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Announcements 3/30/11

Announcements 3/30/11. Prayer Exam 3 review session: Thursday, 5-6:30 pm. Location: room C258 ESC Exam 3 starts Saturday, goes through next Saturday. Exam not written yet… on Friday I’ll be able to give you some details.

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Announcements 3/30/11

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  1. Announcements 3/30/11 • Prayer • Exam 3 review session: Thursday, 5-6:30 pm. Location: room C258 ESC • Exam 3 starts Saturday, goes through next Saturday. • Exam not written yet… on Friday I’ll be able to give you some details. • If you used the Tutorial Lab, please rate the TAs: http://gardner.byu.edu/tas/tutorrating.html (rating form has photos)

  2. Reading quiz • Which of the following is NOT true of the 3D “wave vector”? • Its magnitude is equal to 2p/l. • In a plane wave it points in the same direction everywhere in space. • In a spherical wave it points in the same direction everywhere in space. • It tells us which way the wave is going. • In 1D it reduces to the wave number k.

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

  4. Student-designed problem: Transverse Wave • 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 Actual laser spectrum is over 100 narrower than the width of the red line • What makes a laser special? (answers from class) • Some of my answers: • Single wavelength • Intense • Collimated • Coherence (spatial, temporal) - 99.9999999999% Laser spectrum Blackbody spectrum

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

  7. Green laser pointer More Wikipedia 5. laser beam 1. gain medium (Nd:YVO4 crystal) 3. high reflector 4. output coupler 2. laser pumping energy (808 nm LED beam)

  8. More Wikipedia

  9. Circular Polarization Remember these pictures? Pictures from Wikipedia

  10. Optical Retarders, aka “Wave plates” • Quartz, SiO2: no = 1.544, ne = 1.553 • Calcite, CaCO3: no = 1.658, ne = 1.486 Calcite crystal: Pictures from Wikipedia

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

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