Abstract
Due to the light scattering effect, it is difficult to directly achieve optical focusing and imaging in turbid media, such as milk and biological tissue. The turbidity suppression of a scattering medium and control of light through the scattering medium are important for imaging on biological tissue or biophotonics. Optical phase conjugation is a novel technology on turbidity suppression by directly creating phase conjugation light waves to form time-reversed light. In this work, we report a digital optical phase conjugation system based on off-axis holography. Compared with traditional digital optical phase conjugation methods, the off-axis holography acquires the conjugation phase using only one interference image, obviously saving photo acquisition time. Furthermore, we tested the optical phase conjugate reduction performance of this system and also achieved optical focusing through the diffuser. We also proved that the reversing of random scattering in turbid media is achievable by phase conjugation.
Highlights
In our daily life, there are many scattering mediums, such as milk, cloud fog, and human tissue, to name a few
We tested the reduction performance of the phase conjugate system, and optical focusing through the diffuser is achievable
A phase conjugate system based on off-axis digital holography was designed
Summary
There are many scattering mediums, such as milk, cloud fog, and human tissue, to name a few. In 2013, Hillman et al presented a simple and robust digital optical phase conjugation implementation for suppressing multiple scattering They experimentally demonstrated wide-field imaging through a highly scattered sample using DOPC employing a ring interferometer configuration [21]. In 2015, Lee et al demonstrated the realization of a one-wave optical phase conjugation mirror using a spatial light modulator Their method is simple, alignment free, and fast while allowing high-power throughput in the time reversed wave [23]. In 2017, Liu et al used a ferroelectric liquid crystal-based spatial light modulator to develop a simple but fast DOPC system that focuses light through, and inside, scattering media They employed a ferroelectric liquid crystal-based SLM to achieve binary-phase modulation for high speed and high focusing quality [26]. We tested the reduction performance of the phase conjugate system, and optical focusing through the diffuser is achievable
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