Author(s)

Xianfeng Hu

College of Physical Science and Technology, Sichuan University, Chengdu, China.

Transparent liquid flattening or stretching realizes optical path length modulation. A flat thin seal transparent cavity, one flank is an electromagnetic driving membrane and is filled over with transparent liquid. Vibration of the membrane makes the liquid compressing or stretching, changes the liquid layer thickness, i.e. the optical path length of light through the liquid layer. The liquid layer compressed is equivalent to increase membrane tension. The membrane has higher resonant frequency. The cavity diameter 10 mm modulation frequency is about 18 kHz.

Self-Mixing Interference, Optical Path Length, Phase Modulator, Vibration

Hu, X. (2017) An Optical Path Length Modulator for Laser Diode Self-Mixing Interference. Optics and Photonics Journal, 7, 1-5. doi: 10.4236/opj.2017.71001.