Laser and Fiber Optic Puzzle

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Across
  1. 2. An electronic device for increasing the amplitude of electrical signal
  2. 5. (two words)Consisting of or using thin flexible fibers with a glass core through which light signals can be sent with very little loss of strength
  3. 6. A regular repeated 3D arrangement of atoms, ions or molecules in a metal or others crystalline solid
  4. 7. Communication over a distance by cable
  5. 8. The production and discharge of something, especially gas or radiation
  6. 10. (two words)Developed semiconductor heterostructures used in high speed
  7. 12. Gallium Arsenide
  8. 14. A discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents
  9. 17. A solid substance that has a conductivity between an insulator and that of most metals
  10. 19. Molecular Beam Epitaxy
  11. 20. A device using the stimulated emission of radiation by excited atoms to amplify
  12. 21. The branch of science concerned with the investigation and measurement of spectra produced from matter
  13. 24. The branch of physical science that deals with the relations between heat and other forms of energy
  14. 25. The Chemical element of atomic number 81
Down
  1. 1. Crossing the atlantic
  2. 3. The layer of earths atmosphere that contains a high concentration of ions
  3. 4. The emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles
  4. 9. Regular variation in magnitude or position around a central point
  5. 11. (two words)Person who discovered energy quanta
  6. 13. Being less than a millimeter in wavelength
  7. 15. (two words)Description of the motion and interaction of subatomic particles
  8. 16. A thing that repeats something
  9. 18. (two words)Formed a model of an atom
  10. 22. A semiconductor device with three connections
  11. 23. A particle representing a quantum of light