Abstract
Second-harmonic signals of the Lorentzian absorption line at the line center are calculated for various modulation waveforms. The suppression efficiency of fine-pitch étalon fringe signals by those modulation waveforms is discussed. It is found that there are several modulation waveforms that give larger absorption signals and suppress fine-pitch fringe signals more efficiently than does the sinusoidal waveform. The dependence of the efficiency of the fringe-signal suppression on different jitter waveforms is also calculated.
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