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Double-resonance surface sum frequency generation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  If the narrow band visible light is resonant with the electronic states of molecules, as called “double-resonance”, the SFG will be enhanced. If we scan the wavelength of the visible light, we can get the electronic spectra of the adsorbate on surfaces. But the challenging is that it is hard to get a stable visible laser output(both power and beam pointing) with available laser systems. Now we are developing a novel way of white light to replace scanning wavelength.