Differential-Frequency Generation (DFG)
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w1 - w2 = w3 (or 1/l1 -1/l2 = 1/l3 in wavelength) It mixs one high energy photon and one low energy photon into another low energy photon. |
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For example: |
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532 nm - 810 nm ----> 1550 nm
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| Differential Frequency Generation |