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Dynamic phase measurement of fast liquid crystal phase modulators
Optics Express
|October 14, 2022
Summary
We developed a new method for measuring liquid crystal phase modulators. This technique achieves high accuracy (<0.5° phase error) and low crosstalk (50 dB) for dynamic optical phase modulation.
Area of Science:
- Optics
- Materials Science
- Photonics
Background:
- Liquid crystal phase modulators are crucial for optical systems.
- Accurate dynamic characterization is essential for high-performance devices.
- Existing methods may lack the bandwidth or precision for advanced modulators.
Purpose of the Study:
- To present a novel technique for time-resolved dynamic measurements of multi-pixel analog liquid crystal phase modulators.
- To demonstrate the capability of deconvolving phase modulation with wide bandwidth.
- To quantify the phase error and crosstalk rejection of the modulator.
Main Methods:
- Utilized a heterodyne interferometer for simultaneous, independent interrogation of two pixels.
- Employed a 1 kHz frame rate for dynamic measurements.
- Applied the technique to a custom flexoelectro-optic chiral nematic liquid crystal device.
Main Results:
- Achieved a root mean squared optical phase error of less than 0.5° within a 30 Hz to 25 kHz bandwidth.
- Demonstrated a crosstalk rejection of 50 dB.
- Successfully performed dynamic time-resolved measurements.
Conclusions:
- The developed heterodyne interferometry technique provides accurate and precise dynamic characterization of liquid crystal phase modulators.
- The method is broadly applicable to various types of optical phase modulators and spatial light modulators.
- This technique enables the development of higher-performance optical systems.
