Frequency shifter type optical modulator and laser Doppler measuring device

摘要

PROBLEM TO BE SOLVED: To provide a frequency shifter type optical modulator and a laser Doppler measuring device which can easily realize miniaturization, high accuracy and high frequency. A frequency shifter type optical modulator 12 includes an oscillator 30 and a diffraction grating 34 including 32 grooves arranged side by side in the displacement direction of the oscillator 30, and the diffraction grating 34 is an oscillator. It is provided in 30. By providing the diffraction grating 34 in the vibrator 30, it becomes easy to proceed with the realization of miniaturization and high accuracy of the frequency shifter type optical modulator 12. In addition, it will be easier to support the high frequency region of the MHz band, that is, to realize higher frequencies. The effect based on the combination of the vibrator 30 and the diffraction grating 34 can be efficiently obtained. [Selection diagram] Fig. 2