Milliseconds-response optical lenses and high-speed optical devices using ultrasound

利用两种不相容液体的折射率差，研制了一种超声变焦距透镜。两种液体之间的界面轮廓可以通过超声波的辐射力来改变，从而使透镜成为一个可变焦距的透镜。焦点可通过驱动电压控制，最短响应时间可达6.7ms。通过在光轴上以1 kHz的频率扫描焦点，即可获得共焦图像。非轴对称声压场也可以实现三维聚焦扫描。

An ultrasonic variable optical focus lens which utilizes the refractive index difference of two immiscible liquids was developed. The profile of interface between the two liquids can change by radiation force of ultrasound so that the lens can act as a variable focus lens. The focal point could be controlled by the driving voltage, and the shortest response time of 6.7 ms could be achieved. The confocal image could be captured by sweeping the focal point in the light axis at 1 kHz. Three dimensional focal scanning could be also achieved by non-axisymmetric sound pressure field.