Week 6 Coherence & Interference

Question 1

define temporal coherence

Answer 1

measure of the average correlation of the phase of the light wave along direction of propagation

Question 2

what is the coherence time and length equation

Answer 2

tc = lc / v

Question 3

what is the main concept of spatial coherence

Answer 3

coherence across a wavefront

Question 4

what is the visibility of fringes equation

Answer 4

V = Imax-Imin / Imax+Imin

Question 5

what is the fringe spacing equation

Answer 5

y = λD/d

Question 6

what is the path difference equation

Answer 6

y = λ^2D / dΔλ

Question 7

how does a lloyd mirror work and what is key difference between it and youngs double slit

Answer 7

works similar to youngs double slit but relies on reflection

key difference is lloyd has a π phase shift when reflecting off an optically denser surface

Question 8

what is the n slits intensity equation

Answer 8

Etot*Etot = E0^2 [sin(Nkδ/2)]^2 / [sin(kδ/2)]^2

Question 9

what is the Michelson interferometer path difference equation

Answer 9

Δ = 2(d1 - d2)

Question 10

what is the Michelson interferometer intensity equation

Answer 10

I = 4|E|^2[sin(πΔ/λ)]^2