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Ultrashort vortex from a Gaussian pulse - An achromatic-interferometric approach.
Dinesh N Naik1, Nabil A Saad1, D Narayana Rao1
1School of Physics, University of Hyderabad, Hyderabad, 500046, India.
Scientific Reports
|May 26, 2017
Summary
Researchers utilized a Sagnac interferometer to create a stable, achromatic white-light vortex beam. This novel method generates optical vortex pulses with orbital angular momentum (OAM) for diverse applications.
Area of Science:
- Optics and Photonics
- Interferometry
- Quantum Optics
Background:
- The Sagnac interferometer, a long-standing optical device, has found a novel application.
- Generating achromatic optical vortices with orbital angular momentum (OAM) is crucial for advanced optical applications.
Purpose of the Study:
- To demonstrate a new method for generating achromatic single-charge optical vortices using a Sagnac interferometer.
- To explore the potential of this method for creating stable white-light vortices and ultrashort optical vortex pulses.
Main Methods:
- Interference of counter-propagating polychromatic Gaussian beams with specific phase and lateral shear.
- Utilizing a wavelength-tunable continuous-wave laser to cover the visible spectrum.
- Demonstrating applications including nonlinear frequency conversion and vector pulse generation.
Main Results:
- Successfully generated a stable, achromatic white-light vortex beam with excellent propagation integrity.
- Achieved vortex generation across the visible wavelength range.
- Demonstrated the generation of ultrashort optical vortex pulses and their subsequent manipulation.
Conclusions:
- The Sagnac interferometer can be effectively used to generate robust achromatic vortex pulses.
- The proposed scheme offers significant advantages for various applications due to its simplicity and lack of spectral-temporal limitations.
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