Abstract
Periodic nonlinear errors caused by frequency mixing are serious obstacles for increasing the resolution of heterodyne grating interferometers. To eliminate the periodic nonlinear errors, a spatially separated heterodyne grating interferometer is proposed in this study. Two modulated beams with different frequencies are transferred respectively by two fibers, which form a spatially separated construction. A couple of comparison experiments in both time domain and frequency domain are designed and conducted. The results of the frequency-spectrum analysis experiment showed that the periodic nonlinear errors were no larger than 0.086 nm, which proved that the proposed system was effectual in eliminating periodic nonlinear errors.
| Original language | English |
|---|---|
| Pages (from-to) | 31384-31393 |
| Number of pages | 10 |
| Journal | Optics Express |
| Volume | 25 |
| Issue number | 25 |
| DOIs | |
| State | Published - 11 Dec 2017 |
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