Announcements 2/15/12 Prayer Exams: I just got them from Testing Center 1 hour ago. Will work on grading with TAs… target time = graded by Friday evening. Exam solutions: posted to website. a. If you have questions about your exam after getting it back, please look at the solutions first . If you can’t figure things out from there, then come to me or the TAs. Reading assignment change. For next time: a. Remove section 6.7 (we’ll talk about that section today) b. Add Appendix 6.A c. Add section 7.1
Transcript
Announcements 2/15/12 Prayer Exams: I just got them from Testing Center 1 hour
ago. Will work on grading with TAs… target time = graded by Friday evening.
Exam solutions: posted to website.a. If you have questions about your exam after
getting it back, please look at the solutions first. If you can’t figure things out from there, then come to me or the TAs.
Reading assignment change. For next time: a. Remove section 6.7 (we’ll talk about that section
today)b. Add Appendix 6.Ac. Add section 7.1
Reading Quiz
When multiple elements are in a beam path, the Jones matrices to find the final optical polarization are written
a. with the first element’s matrix on the right
b. with the first element’s matrix on the leftc. in any order
Reading Quiz
After passing through a set of polarization elements, the intensity of the outgoing light can become reduced relative to the intensity of the incident light.
a. trueb. false
Review question (ungraded)
In polaroid films, polymer chains are aligned. The polarization axis that transmits light is oriented:
a. along the chainsb. perpendicular to the chainsc. at 45 degrees to the planes
Jones matrices: review from last time
Matrices for linear polarizers:a. x-polarizationb. y-polarizationc. 45 polarizationd. arbitrary angle polarization
Thought question (ungraded)
The element that should be used to change linearly polarized light into circularly polarized light is the
a. quarter waveplateb. half waveplatec. full waveplate
(“Waveplate” is synonymous with “optical retarder”. Through anisotropic crystal effects it introduces a phase shift, or retardance, between horizontally and vertically polarized light.)
Animation 4: waveplates
Waveplate = Retarder = Birefringent Crystal
Jones matrices for quarter and half waveplates
Summary: What will be given on exam
Thought question (ungraded)
If a RCP beam strikes a metal mirror at normal incidence, what will the resulting beam be?
a. LCPb. RCPc. linearly polarizedd. unpolarized
Thought question (ungraded)
A laser beam traveling 2 inches above the surface of an optical table reflects off a mirror and remains parallel to the plane of the table. Top view is shown.
Which polarization is in the x-direction and which is in the y-direction? (x-direction = horizontal, y = vertical)
a. s-polar = x, p-polar = yb. s-polar = y, p-polar = x
