Abstract
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.
Highlights
Laser self-mixing interference has only one optical path
The cavity diameter 10 mm modulation frequency is about 18 kHz
It is an advantage in optical arrange, and is a disadvantage in optical modulating
Summary
Laser self-mixing interference has only one optical path. It is an advantage in optical arrange, and is a disadvantage in optical modulating. The phase modulation for self-mixing interference can adopt inserted an AOM or EOM into the optical path, modulating operating current (MOC) or vibrating laser diode modules [1]-[7]. AOM, EOM or MOC may cause optical intensity modulating. Like as AOM, if the modulation does not cause modulating structure in optical media, the modulator will do not produce light scattering. The machine vibration only causes the media layer flattening or stretching. Optical path length of light passing through the media layer will be modulated
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