1. This larger signal is often exploited to produce a stronger second harmonic signal. 2. The second harmonic not only has twice the frequency but also twice the phase. 3. Second harmonic generation leads to doubling of the frequency of infrared carbon dioxide lasers.4. In addition there is a control to vary the amount of second harmonic distortion. 5. Optical rectification also occurs on metal surfaces by similar effect as surface second harmonic generation. 6. In 1993, Lewis examined the second harmonic response of delicious styryl dyes in electric fields. 7. The second harmonic can be used to reduce the overlap with edges with finite sharpness. 8. In a push pull amplifier this second harmonic distortion is cancelled in the output transformer. 9. The 8 bar subject starts in minims with a second harmonic half in slow quavers. 10. The resulting measured second harmonic signal contains the second harmonic component from the buried interface alone.
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