Excitation ntawm thib ob harmonics nyob rau hauv ib tug dav spectrum Txij li thaum nrhiav tau ntawm ob-order nonlinear optical teebmeem nyob rau hauv lub 1960s, tau aroused dav kev txaus siab ntawm cov kws tshawb fawb, txog tam sim no, raws li qhov thib ob harmonic, thiab zaus cuam tshuam, tau tsim los ntawm huab ultraviolet mus rau lub Far infrared band o...
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