Announcements 11/22/10 Prayer No office hours tomorrow (neither TA nor I), even though we do have...
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Transcript of Announcements 11/22/10 Prayer No office hours tomorrow (neither TA nor I), even though we do have...
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.
Reading quiz
Which of the following is NOT true of the wave vector?
a. Its magnitude is equal to 2/.b. In a plane wave it points in the same
direction everywhere in space.c. In a spherical wave it points in the
same direction everywhere in space.d. It tells us which way the wave is
going.e. In one dimension it reduces to the
wave number k.
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?
Lasers
What makes a laser special? (answers from class)
Some of my answers:a. Single wavelengthb. Intensec. Collimatedd. Coherence (spatial,
temporal) - 99.9999999999%
Actual laser spectrum over 100 narrower than the width of the
red line
Blackbody spectrum
Laser spectrum
Lasers
Principal components:1. Gain medium2. Laser pumping energy3. High reflector4. Output coupler5. Laser beam
Energy (light,
electrical, etc.)
AbsorptionEmission
light
Stimulated Emission
Image & list from Wikipedia
Energy (light only)
More Wikipedia
Green laser pointer
1. Gain medium2. Laser pumping energy3. High reflector4. Output coupler5. Laser beam
Optical Retarders, aka “Wave plates”
Quartz, SiO2: no = 1.544, ne = 1.553
Calcite, CaCO3: no = 1.658, ne = 1.486
Pictures from Wikipedia
Calcite crystal:
Optical Modulators
Electro-optic modulator Acousto-optic modulator
AOM
EOM
www.newport.com wikipedia
Field changes vertical index of
refraction