The heterodyning principle is well known in nonlinear optics as difference frequency generation (DFG).
在非线性光学领域,超

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

理就是著名的
频产
(DFG)技术。
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