Nonlinear Optics

1
Nonlinear Optics
T. Kippenberg (2006)
Tobias J. Kippenberg tjk_at_mpq.mpg.de T.W. Hänsch
Division
Lecture 14
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Stimulated Brillouin Scattering
T. Kippenberg (2006)

• Properties
• The coupling of the optical fields to the
  acoustic wave is mediated by eletrostriction
  i.e. the property of a medium to contract itself
  in the presence of an optical or DC field.
• The scattering can be interpreted as reflection
  of a traveling wave
• The observed frequency shift is the Doppler
  shift, i.e. kvs

Lecture 14
3
T. Kippenberg (2006)
Acousto-Optic Modulator
Laser-Water Scattering                           
                                                  
                                                  
            
Lecture 14
4
Acoustical and Optical Phonons
T. Kippenberg (2006)
Dispersion relation for a diatomic chain
Optical phonons
Molecular vibrations, no center of mass motion
Acoustic phonons
Center of mass motion, i.e. propagating density
waves
Lecture 14
5
Raman scattering
T. Kippenberg (2006)
Vibrational mode of CO2 (symmetric stretch)
Lecture 14
6
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7
Raman susceptibility
T. Kippenberg (2006)
Lecture 14
8
Stokes Anti-Stokes Coupling
Lecture 14