refractive index petr Šafařík masaryk university: astrophysics institute of scientific...
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Refractive index
Petr Šafařík
Petr ŠafaříkMasaryk university: Astrophysics
Institute of Scientific Instruments: Coherence Optics
E-mail:[email protected]: [email protected]
ICQ: 137-455-645Jabber:[email protected]
http://physics.muni.cz/~petos
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
Theory
Definition of refractive index:The refractive index of a medium is defined as ratio
of the phase velocity in the reference medium to velocity in the medium itself.
Reference medium: usualy vacuum. Usually given the symbol n
Theory In case of light:
rrn 0r
rn
Phase & group velocity
kvp
kvg
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
Methods of measuring
Indirect – Edlén‘s formula Direct – Laser refratometer
Methods of measuring
Indirect – Edlén‘s formula Direct – Laser refratometer
Indirect – Edlén‘s formula
p – pressure t – temperature (s-1) – dispersion coefficient
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t), (
t)p],-,([
,
)(t)(s-n
-
Weather bureau
Methods of measuring
Indirect – Edlén‘s formula Direct – Laser refratometer
Methods of measuring
Indirect – Edlén‘s formula Direct – Laser refratometer
Laser refractometer
Michelson‘s interferometr:
Laser refractometer Refractometr based on Michelson:
D - detector, L – laser, M – MirrorVP - Vacuum pump, VM - Vacuum meter , VS- Vacuum
sensor
Laser refractometer
Examples of interference fringes:
Fabry-Perot based refractometer
Scheme:
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
My results
Scheme:
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
Summary Light rays chanfe direction, when they
cross the interface from material to other one by the Snellius law:
Light reflects partially from surfaces, that have refractive index fifferent from that of their suroundings.
sinsin 21 nn
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
Questions
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