SFG

Sum Frequency Generation (SFG)

is a nonlinear optical process where two photons with different frequencies, generate one photon with a frequency (and energy) which is the summation of the two frequencies (energies) of the initial wavelengths. SHG is a specific degenerate case of SFG where both the initial frequencies are the same.  
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What is the difference between Sum Frequency Generation (SFG) and Second Harmonic Generation (SHG)?

How is Sum Frequency Generation (SFG) used in spectroscopy and imaging applications?

What are the key nonlinear crystals used for Sum Frequency Generation (SFG)?

What phase-matching techniques are used to enhance Sum Frequency Generation efficiency?

What are the industrial and scientific applications of Sum Frequency Generation (SFG)?

Sum Frequency Generation SFG

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