| 摘 要： | An experimental set-up of LDA with interference plane gradients is constructed to show the conditional heterodyne contribution. The separation factor (S_f) of two Doppler spectrum is calculated in the disc experiment We find that S_f has no maximum value, as one could be tempted to expect for the case Z_v=Z_(min). In a single lens set-up it is difficult to suppress the conditional heterodyne contribution Telescope-lens system can be used to obtain both the noncoherent detection for the conditional heterodyne and the larger separation factor S_f.
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