"Second-harmonic light" . . . "Second-harmonic generation" . "frequency-doubling" . . . "second-harmonic generation" . "second harmonic generation" . "second-harmonic generating (SHG)" . "Second-harmonic generation" . "frequency doubled" . "frequency-doubled" . "frequency doubling" . . "Second Harmonic Generation" . "types" . "Frequency doubling" . . . "SHG" . "second" . . "phase-matching condition" . "Frequency doubling (SHG)" . . . .