Two-wavelength laser-diode heterodyne interferometry with one phasemeter.
Two-wavelength laser-diode heterodyne interferometry with one phasemeter.
复制标题
使用一台相位计的双波长激光二极管外差干涉测量法。
作者：
R. Onodera;Y. Ishii
A two-wavelength laser-diode interferometer that is based on heterodyne detection with one phasemeter has been constructed. Two laser diodes are frequency modulated by mutually inverted sawtooth currents on an unbalanced interferometer. One can measure the tested phase at a synthetic wavelength from the sum of the interference beat signals by synchronizing them with the modulation frequency. The experimental result presented shows a phase-measurement range with a 4.7-μm synthetic wavelength.
