lecture14

lecture14 - SOME UNITS Vacuum Wavelength, , in , nm or m 1...

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Vacuum Wavelength, , in Å , nm or m 1 Å =10 10 m =10 4 m =10 1 nm 10 Å =10 9 m =10 3 m = 1 nm 10 +4 Å =10 6 m = 1 m =10 +3 nm Visible light: 0.4 to 0.65 m Light from HeNe lasers: 0.633 m Optical fiber communications: 1.55 m Frequency, f or , in Hz f=c/ or f =c c=2.9979 10 +8 m/s ~ 3 10 +8 m/s Wave number, WN, in cm 1 No. of wavelengths fitting into 1.00 cm 4 1 10 ] m in [ ] cm in WN [ SOME UNITS
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Energy needed to raise a charge q over a voltage of V is E = q V, or E = q V E and E in J, q in C, V and V in volt 1 Electron volt = 1 eV=energy needed to raise an electron over a potential difference of 1 V. 1 eV = 1.6021 x10 19 J Photon energy, E or E, in J or Ev Einstein relation: hf = h = E = E 2 E 1 Planck’s constant: h = 6.625 10 34 J s = 4.1356 10 15 eV s hf E 2 E 1 SOME RELATIONS
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Photon energy, E or E, in J or eV Einstein relation: hf =h = E=E 2 -E 1 E hc f c , h E f 2398 . 1 E E 2398 . 1 eV m eV m ] eV in E [ 8066 ] cm in WN [ 2398 . 1 ] eV in E ][ m in [ 10 ] m in ][ cm in WN [ s / m 10 3 s / m 10 9979 . 2 c f 1 4 1 8 8 SOME RELATIONS
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  |  | Band width f = |f 2 f 1 | FULL WIDTH BETWEEN HALF POWER (FWHP)
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lecture14 - SOME UNITS Vacuum Wavelength, , in , nm or m 1...

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