refractive index petr Šafařík masaryk university: astrophysics institute of scientific...
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Refractive index
Petr Šafařík
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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
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Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
![Page 5: Refractive index Petr Šafařík Masaryk university: Astrophysics Institute of Scientific Instruments: Coherence Optics E-mail:petos@mail.muni.cz E-mail:](https://reader038.vdocuments.us/reader038/viewer/2022110206/56649f445503460f94c65c03/html5/thumbnails/5.jpg)
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
![Page 6: Refractive index Petr Šafařík Masaryk university: Astrophysics Institute of Scientific Instruments: Coherence Optics E-mail:petos@mail.muni.cz E-mail:](https://reader038.vdocuments.us/reader038/viewer/2022110206/56649f445503460f94c65c03/html5/thumbnails/6.jpg)
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
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Theory In case of light:
rrn 0r
rn
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Phase & group velocity
kvp
kvg
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Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
![Page 10: Refractive index Petr Šafařík Masaryk university: Astrophysics Institute of Scientific Instruments: Coherence Optics E-mail:petos@mail.muni.cz E-mail:](https://reader038.vdocuments.us/reader038/viewer/2022110206/56649f445503460f94c65c03/html5/thumbnails/10.jpg)
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
![Page 11: Refractive index Petr Šafařík Masaryk university: Astrophysics Institute of Scientific Instruments: Coherence Optics E-mail:petos@mail.muni.cz E-mail:](https://reader038.vdocuments.us/reader038/viewer/2022110206/56649f445503460f94c65c03/html5/thumbnails/11.jpg)
Methods of measuring
Indirect – Edlén‘s formula Direct – Laser refratometer
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Methods of measuring
Indirect – Edlén‘s formula Direct – Laser refratometer
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Indirect – Edlén‘s formula
p – pressure t – temperature (s-1) – dispersion coefficient
1003661001
0097206010101
4396095
1 8
t), (
t)p],-,([
,
)(t)(s-n
-
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Weather bureau
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Methods of measuring
Indirect – Edlén‘s formula Direct – Laser refratometer
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Methods of measuring
Indirect – Edlén‘s formula Direct – Laser refratometer
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Laser refractometer
Michelson‘s interferometr:
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Laser refractometer Refractometr based on Michelson:
D - detector, L – laser, M – MirrorVP - Vacuum pump, VM - Vacuum meter , VS- Vacuum
sensor
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Laser refractometer
Examples of interference fringes:
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Fabry-Perot based refractometer
Scheme:
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Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
![Page 22: Refractive index Petr Šafařík Masaryk university: Astrophysics Institute of Scientific Instruments: Coherence Optics E-mail:petos@mail.muni.cz E-mail:](https://reader038.vdocuments.us/reader038/viewer/2022110206/56649f445503460f94c65c03/html5/thumbnails/22.jpg)
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
![Page 23: Refractive index Petr Šafařík Masaryk university: Astrophysics Institute of Scientific Instruments: Coherence Optics E-mail:petos@mail.muni.cz E-mail:](https://reader038.vdocuments.us/reader038/viewer/2022110206/56649f445503460f94c65c03/html5/thumbnails/23.jpg)
My results
Scheme:
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Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
![Page 27: Refractive index Petr Šafařík Masaryk university: Astrophysics Institute of Scientific Instruments: Coherence Optics E-mail:petos@mail.muni.cz E-mail:](https://reader038.vdocuments.us/reader038/viewer/2022110206/56649f445503460f94c65c03/html5/thumbnails/27.jpg)
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
![Page 28: Refractive index Petr Šafařík Masaryk university: Astrophysics Institute of Scientific Instruments: Coherence Optics E-mail:petos@mail.muni.cz E-mail:](https://reader038.vdocuments.us/reader038/viewer/2022110206/56649f445503460f94c65c03/html5/thumbnails/28.jpg)
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
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Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
![Page 30: Refractive index Petr Šafařík Masaryk university: Astrophysics Institute of Scientific Instruments: Coherence Optics E-mail:petos@mail.muni.cz E-mail:](https://reader038.vdocuments.us/reader038/viewer/2022110206/56649f445503460f94c65c03/html5/thumbnails/30.jpg)
Outline
Theory of the refractive index Methods of measuring refractive
index My results at ISI Brno Summary Questions
![Page 31: Refractive index Petr Šafařík Masaryk university: Astrophysics Institute of Scientific Instruments: Coherence Optics E-mail:petos@mail.muni.cz E-mail:](https://reader038.vdocuments.us/reader038/viewer/2022110206/56649f445503460f94c65c03/html5/thumbnails/31.jpg)
Questions
Your time…