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Sum-frequency generation (SFG) is used in many laboratories to extend the wavelength coverage of laser systems. Another field where this technique is frequently applied is in the study of oriented molecular monolayers on interfaces.1 In the former case, one uses bulk crystals, and in order to minimize absorption losses, one stays away from the absorption bands of the material. In the latter case, absorption does not play a role, and one can substantially enhance the response of the system by tuning to the absorption bands of the molecules. Apart from resonant enhancement, this provides information on the molecular species and the specific molecular bonds that are connected with the absorption band.
© 1994 IEEE
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