The minimum Euclidean distance principle applied to improve the modulation diffraction efficiency in digitally...

Area of Science:

• Optics
• Materials Science
• Electrical Engineering

Background:

• Liquid Crystal on Silicon (LCoS) displays utilize digital addressing for spatial light modulation.
• This digital addressing can induce temporal phase fluctuations in optical beams.
• Such fluctuations may negatively impact the performance of diffractive optical elements (DOEs).

Purpose of the Study:

• To characterize phase fluctuations in LCoS displays under different digital addressing sequences.
• To develop a diffractive model for evaluating DOE modulation diffraction efficiency with phase fluctuations.
• To identify the optimal addressing sequence for minimizing efficiency reduction.

Main Methods:

• Experimental characterization of fluctuation amplitude and phase depth for three digital addressing sequences.
• Development of a diffractive model to predict modulation diffraction efficiency.
• Numerical calculation and comparison with experimental results.

Main Results:

• Different digital addressing sequences exhibit varying degrees of temporal phase fluctuations.
• A specific, highly stable electrical sequence resulted in the best modulation diffraction efficiency.
• This optimal sequence achieved good performance despite a limited phase depth of 280 degrees.

Conclusions:

• Temporal phase fluctuations from digital addressing in LCoS displays are a significant factor affecting DOE performance.
• The proposed diffractive model accurately predicts modulation diffraction efficiency in the presence of phase fluctuations.
• Selecting the most stable electrical addressing sequence is crucial for maximizing diffraction efficiency in diffractive optics applications.