Pure modulation and accurate measurement of optical beam’s tilt and displacement

We developed a tilt modulation technique of a laser beam with a wedged crystal. Combined with a phase-compensating crystal, a pure tilt modulation with a wide bandwidth (actually determined by the bandwidth of electro-optic crystals) is realized. By Fourier transformation with a lens, the tilt signa...

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Veröffentlicht in:Review of scientific instruments 2021-06, Vol.92 (6), p.064504-064504
Hauptverfasser: Sun, Hengxin, Li, Zhi, Guo, Hui, Liu, Kui, Gao, Jiangrui
Format: Artikel
Sprache:eng
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Zusammenfassung:We developed a tilt modulation technique of a laser beam with a wedged crystal. Combined with a phase-compensating crystal, a pure tilt modulation with a wide bandwidth (actually determined by the bandwidth of electro-optic crystals) is realized. By Fourier transformation with a lens, the tilt signal is transformed into displacement. With homodyne detection using a local oscillator of the first-order Hermite–Gauss mode (HG10) and a 4F phase-monitoring system, we measure the displacement and tilt of a laser probe beam. This technique can be used in metrology, such as Newtonian gravitational constant determination and gravitational wave detection, or the calibration of a spatial sensor, such as tilt/displacement sensors.
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0050550