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From Reinhard Schinke

From Reinhard Schinke. From Reinhard Schinke. From Reinhard Schinke. From Reinhard Schinke. From Reinhard Schinke. Lasers: N 2 >>N 1. 2. A 23. B 21 W( w ). A 21. B 23 W p ( w ). 1. A 13. 3. Lasers: N 2 >>N 1. 2. Lase. A 23. B 21 W( w ). A 21 slow. B 23 W p ( w ). 1. Pump.

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From Reinhard Schinke

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  1. From Reinhard Schinke

  2. From Reinhard Schinke

  3. From Reinhard Schinke

  4. From Reinhard Schinke

  5. From Reinhard Schinke

  6. Lasers: N2>>N1 2 A23 B21W(w) A21 B23Wp(w) 1 A13 3

  7. Lasers: N2>>N1 2 Lase A23 B21W(w) A21 slow B23Wp(w) 1 Pump A13 fast 3

  8. Nd3+:Y3Al5O12 (YAG)

  9. Cavity—2 mirrors separated by nl/2 Lasers characterized by: Directionality Monochromatic Brightness Coherence Discuss: Threshhold

  10. Linewidths Homogeneous Broadening: Affects every molecule the same way e.g. time energy uncertainty principle and pressure broadening dEdt h dndt 1 sets a minimum linewidth of dw  t-1 Expressed as e-t/tdecay of final state probability the corresponds after Fourier transform to a Lorentzian lineshape FWHM=t

  11. Linewidths Inhomogeneous broadening: Collection of molecules have a distribution of transition energies. Typically given by statistics of different molecular environments and described by Gaussian functions. FWHM=2s(2ln2) e.g. Doppler Broadening

  12. Mon Feb 18 Presidents day • Weds: Rayleigh and Raman Scattering • Weds Feb 27: Projects Part1

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