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Ultrashort-pulse modulation in adiabatically prepared Raman media.
Sarah Gundry1, Marcel P Anscombe, Abubaker M Abdulla
1Blackett Laboratory, Imperial College London, Prince Consort Road, South Kensington, London SW7 2BZ, UK. sarah.gundry@imperial.ac.uk
Optics Letters
|January 29, 2005
Summary
We efficiently modulated ultrashort laser pulses using Raman coherence, generating broadband Raman sidebands. This technique enables the creation of intense, few-femtosecond pulses for advanced applications.
Area of Science:
- Nonlinear Optics
- Quantum Optics
- Ultrafast Laser Science
Background:
- Ultrashort laser pulses are crucial for studying ultrafast phenomena.
- Generating broadband coherent light is essential for high-resolution spectroscopy and advanced imaging.
- Raman scattering offers a pathway to modify laser pulse properties.
Purpose of the Study:
- To demonstrate efficient modulation of femtosecond laser pulses.
- To generate broadband Raman sidebands with high efficiency.
- To investigate the underlying mechanism of vibrational coherence for pulse generation.
Main Methods:
- Coherent preparation of a Raman medium using nanosecond pulses.
- Interaction of femtosecond pulses with the prepared Raman medium.
- Spectral analysis of generated Raman sidebands.
Main Results:
- Efficient modulation of ~100-femtosecond pulses achieved.
- Broadband Raman sidebands spanning 360 THz generated with >5% efficiency.
- Demonstration of a robust vibrational coherence mechanism.
- Potential for generating a train of ~3-fs pulses with peak intensity >10^13 W cm^-2.
Conclusions:
- Coherent preparation of Raman media enables efficient ultrashort pulse modulation.
- The generated broadband spectrum can be compressed into intense few-femtosecond pulses.
- This method offers a novel route for generating extreme ultrashort laser pulses.