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High-resolution, high-speed photorefractive incoherent-to-coherent optical converter
Optics Letters
|December 12, 2007
Summary
We developed a fast ultraviolet-driven photorefractive incoherent-to-coherent optical converter. This device achieves high resolution and conversion rates, outperforming existing spatial light modulators.
Area of Science:
- Optoelectronics
- Materials Science
- Nonlinear Optics
Background:
- Photorefractive materials enable optical signal processing.
- Efficient incoherent-to-coherent conversion is crucial for optical computing and communication.
- Existing spatial light modulators face limitations in speed, resolution, or power consumption.
Purpose of the Study:
- To demonstrate a novel photorefractive incoherent-to-coherent optical converter.
- To achieve high performance in terms of response time, resolution, and conversion rate.
- To compare the device's performance against existing technologies.
Main Methods:
- Implementation of a device using KNbO3 crystal.
- Utilizing ultraviolet light for device operation.
- Leveraging anisotropic Bragg diffraction at a photorefractive grating for conversion.
Main Results:
- Achieved a response time of 35 microseconds.
- Demonstrated an optical resolution of 124 line pairs/mm.
- Obtained a conversion rate of 90 Gbits/(s cm(2)) with low switching energy (0.5 pJ/bit).
Conclusions:
- The developed device offers superior optical resolution and conversion rates compared to existing photorefractive and multiple quantum well devices.
- The device is faster than liquid crystal-based modulators.
- This technology presents a promising advancement for high-speed optical information processing.
