The heterodyning principle is well known in nonlinear optics as difference frequency generation (DFG).
在非线性光学领域,超外差原理就是著名的差频产
(DFG)技术。
The heterodyning principle is well known in nonlinear optics as difference frequency generation (DFG).
在非线性光学领域,超外差原理就是著名的差频产(DFG)技术。
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