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Light interferometry

Olomouc 2017. Light interferometry. Pavel Pavlíček. Welcome speech. Welcome speech. Light interferometry. Interferometry : technique. Interference : phenomenon. Interferometry : technique. Interference : phenomenon. crest cresta h řeben. trough ventre brázda.

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Light interferometry

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  1. Olomouc 2017 Light interferometry Pavel Pavlíček

  2. Welcome speech

  3. Welcome speech

  4. Light interferometry Interferometry : technique Interference : phenomenon

  5. Interferometry : technique Interference : phenomenon crest cresta hřeben troughventrebrázda

  6. Interference is a phenomenon in which two waves superpose anatomy of a wave crest cresta hřeben troughventrebrázda

  7. Superposition of waves

  8. Superposition of waves

  9. Superposition of waves

  10. Superposition of waves

  11. Superposition of waves

  12. Superposition of waves

  13. Superposition of waves

  14. Superposition of waves in phase

  15. Superposition of waves in phase

  16. Superposition of waves

  17. Superposition of waves out of phase

  18. Superposition of waves out of phase

  19. Interference continuum of possibilities between „in phase“ and „out of phase“ out of phase in phase wave of zero amplitude giant wave constructive interference destructive interference

  20. Interference

  21. waves are superimposed => information about the waves

  22. Michelson interferometer (1880s) Light source Detector

  23. Michelson interferometer Light source in phase I ~10-4 nm Detector l

  24. Michelson interferometer Light source l/4 out of phase Detector

  25. Michelson interferometer Light source l/2 in phase Detector 0 (3/4)l l l/4 l/2

  26. Classical interferometry How does it work? CCD l/4 l/2 0 light source measured object

  27. How does it work? CCD l/4 l/2 0 light source measured object

  28. Michelson-type interferogram phase ------- the deviation of the measured surface from the reference plane y x

  29. A problem: ambiguity

  30. Michelson interferometer Light source I in phase ~ 10- 40 nm Detector l

  31. Michelson interferometer Light source l/4 I out of phase ~ 10- 40 nm Detector l

  32. Michelson interferometer Light source l/2 in phase Detector 0 (3/4)l l l/4 l/2

  33. Spectra and interferograms of various sources I I ~10-4 nm z l I I ~ 10- 40 nm z l I I ~ 1200 nm z l

  34. Measured interferogram of He-Ne laser (l = 633 nm) I 45 mm

  35. Measured interferogram of He-Ne laser (l = 633 nm) I 45 mm

  36. Measured interferogram of He-Ne laser (l = 633 nm) I 45 mm

  37. Measured interferogram of a LED (diodo ad emissione luminosa)

  38. Measured interferogram of a LED (diodo ad emissione luminosa)

  39. Measured interferogram of a LED (diodo ad emissione luminosa)

  40. Measured interferogram of an incandescent lamp (lampadina) intensity path difference

  41. White-light interferometry How does it work? CCD light source measured object reference mirror

  42. How does it work? CCD light source measured object reference mirror

  43. How does it work? CCD light source measured object reference mirror

  44. How does it work? CCD light source measured object reference mirror

  45. Measured height profile height profile coded by gray scales cross section along the horizontal line 100 mm

  46. Measured interferogram and its envelope 74.7 mm 111.9 mm

  47. Thankyoufor your attention

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