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