Sum- and Difference-Frequency Generation
المؤلف:
Walter Koechner Michael Bass
المصدر:
Solid-state Lasers
الجزء والصفحة:
342
23-1-2021
1363
Sum- and Difference-Frequency Generation
Two waves of comparable intensity and frequency ω1 and ω2 are initially present, and a wave at the third frequency ω3 is created through the nonlinear interaction
P(ω3) = ∈0 χ(2)E(ω1)E(ω2), .........(1)
where ω3 = ω1+ω2. Similarly, a wave at the difference frequency ω3−ω2 = ω1 may be generated (ω3 > ω2 > ω1). A very common technique to produce the third harmonic of a neodymium laser is, first, the generation of the second harmonic and then sum frequency generation by mixing the second harmonic (ω2) with the unconverted portion of the fundamental beam (ω1).
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