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Improved optical pulse propagation in water using an evolutionary algorithm.
1Optical Sciences Division, Naval Research Laboratory, Washington DC 20375, USA. marc.currie@nrl.navy.mil
Optics Express
|June 7, 2011
Summary
An evolutionary algorithm optimized optical pulse shaping in water, enhancing transmission efficiency by tailoring pulse amplitude and phase. This method bypasses the need for computational models, directly improving pulse propagation near 800nm.
Area of Science:
- Nonlinear Optics
- Quantum Optics
- Laser Physics
Background:
- Optical pulse propagation in water is crucial for applications like laser ablation and spectroscopy.
- Understanding and controlling pulse behavior in aqueous environments presents significant challenges due to water's complex optical properties.
Purpose of the Study:
- To experimentally optimize the shape of optical pulses for improved propagation in water.
- To maximize transmission efficiency by controlling pulse amplitude and phase using an evolutionary algorithm.
Main Methods:
- Utilized an evolutionary algorithm (EA) to search the amplitude and phase space of an optical pulse shaper.
- Integrated the EA with real-time experimental measurements of transmission efficiency.
- Investigated optical pulse propagation near 800nm in water.
Main Results:
- Achieved enhanced linear optical pulse propagation in water near 800nm.
- Demonstrated a significantly narrower pulse bandwidth.
- Observed that the optimized pulse coincided with a water absorption minimum, indicating absorption spectrum dominance.
Conclusions:
- Direct experimental optimization using an EA is effective for improving optical pulse propagation figures of merit.
- No analytical or computational models are required, simplifying the optimization process.
- Water's absorption spectrum plays a dominant role in limiting transmission efficiency for shaped optical pulses.
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