wk2a - Prisms, fibers, and reflective lenses Total internal...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Prisms, fibers, and reflective lenses Total internal reflection •P r i sm s Dispersion Optical fibers and other waveguides Reflection from paraboloidal mirrors MIT 2.71/2.710 09/13/04 wk2-a-1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Total Internal Reflection (TIR) θ θ reflected incident E.g. interface from glass to air n =1.5, n =1 D 8 . 41 sin if 1 sin 1 crit = = > > n n n n θ nn MIT 2.71/2.710 09/13/04 wk2-a-2 ...? 1 sin if what sin sin sin sin > = = n n n n n n
Background image of page 2
Total Internal Reflection (TIR) θ θ reflected incident nn no light enters the optically less dense space (in actuality the light field in the optically dense space is evanescent evanescent, i.e. exponentially decaying) reflected is energy all , disappears beam reflected when imaginary becomes crit > θ MIT 2.71/2.710 09/13/04 wk2-a-3
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MIT 2.71/2.710 09/13/04 wk2-a-4 Prisms glass air air TIR TIR glass air air air air 45° 45°
Background image of page 4
Frustrated Total Internal Reflection (FTIR) n n ′≈ n Angle of incidence exceeds critical angle air gap glass other material TIR TIR no TIR no TIR
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/17/2011 for the course ME 525 taught by Professor Lucth during the Spring '11 term at Purdue University-West Lafayette.

Page1 / 16

wk2a - Prisms, fibers, and reflective lenses Total internal...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online