Speckle reduction in interferometry using tuneable liquid crystal diffusers

Biswajit Pathak; Nathan Spiller; Steve Elston; Martin Booth; Stephen Morris

doi:10.1117/12.3007724

13 March 2024 Speckle reduction in interferometry using tuneable liquid crystal diffusers

Biswajit Pathak, Nathan Spiller, Steve Elston, Martin Booth, Stephen Morris

Proceedings Volume PC12907, Emerging Liquid Crystal Technologies XIX; PC129070R (2024) https://doi.org/10.1117/12.3007724
Event: SPIE OPTO, 2024, San Francisco, California, United States

Conference Poster

Abstract

Speckle reduction is important in interferometry-based arrangements in order to improve the accuracy and precision of the measurement as such speckle patterns can obscure the underlying fringes, making it difficult to analyze or interpret the results. In the present work, we demonstrate the implementation of a chiral nematic liquid crystal (LC) based diffuser as a tool to mitigate the influence of speckles in an interferometry arrangement. Such LC based diffusers are controlled by adjusting the applied voltage to modulate the phase of the incident light dynamically to create a temporally varying random phase mask that can reduce the impact of spatially varying speckle noise. Proof-of-concept experimental results are included to demonstrate the reduction of speckle in an interferometric arrangement using chiral nematic LC materials. Quality metric parameters are also defined to analyse and quantify the amount of reduction for different values of the applied voltage to the LC diffuser.

Citation Download Citation

Biswajit Pathak, Nathan Spiller, Steve Elston, Martin Booth, and Stephen Morris "Speckle reduction in interferometry using tuneable liquid crystal diffusers", Proc. SPIE PC12907, Emerging Liquid Crystal Technologies XIX, PC129070R (13 March 2024); https://doi.org/10.1117/12.3007724

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