Image fidelity improvement in digital holographic microscopy using optical phase conjugation

Abstract

digital holography, techniques in suppressing noises derived from reference arm are maturely developed. However, techniques for the object counterpart are not being well developed. Optical phase conjugation technique was believed to be a promising method for this interest. A 0°-cut BaTiO3 photorefractive crystal was involved in self-pumped phase conjugation scheme, and was employed to in-line digital holographic microscopy, in both transmission-type and reflection-type configuration. On pure physical compensation basis, results revealed that the image fidelity was improved substantially with 2.9096 times decrease in noise level and 3.5486 times increase in the ability to discriminate noise on average, by suppressing the scattering noise prior to recording stage.

Megahertz-rate shock-wave distortion cancellation via phase conjugate digital in-line holography

“…By passing the return beam back through the phase distortion, the phase delays are corrected but holograms of absorptive or opaque objects are not affected. The concept of phase conjugate mirrors has been used in a variety of applications, such as for removing imaging distortions [13][14][15][16][17] , focusing through turbid media 18,19 , reflecting seed-amplified pulses while dumping background amplified spontaneous emission [20][21][22][23][24] , and eliminating modal dispersion 25 . Phase conjugation techniques have also been implemented using film [26][27][28] and spatial light modulators [29][30][31][32][33][34] .…”