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Quasiperiodic Raman technique for ultrashort pulse generation
D D Yavuz1, D R Walker, M Y Shverdin
1Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA.
Physical Review Letters
|December 20, 2003
Summary
Researchers demonstrate a novel Raman technique generating 200 sidebands. This method shows phase coherence in 15 visible sidebands for nitric oxide (NO) molecules.
Area of Science:
- Nonlinear optics
- Laser spectroscopy
- Molecular physics
Background:
- Raman spectroscopy is a powerful technique for molecular analysis.
- Generating multiple coherent sidebands is crucial for advanced spectroscopic applications.
- Multiphoton ionization provides a sensitive probe for molecular states.
Purpose of the Study:
- To experimentally demonstrate a new Raman technique for generating a large number of sidebands.
- To investigate the phase coherence properties of the generated sidebands.
- To study the multiphoton ionization of nitric oxide (NO) molecules using the generated sidebands.
Main Methods:
- Development and implementation of a novel Raman sideband generation technique.
- Characterization of the generated sidebands' spectral range and number.
- Analysis of multiphoton ionization spectra of NO molecules.
- Measurement of phase coherence among visible sidebands.
Main Results:
- Successful generation of 200 Raman sidebands across a broad wavelength range (3 microm to 195 nm).
- Demonstration of mutual phase coherence among 15 visible sidebands.
- Observation of spectral bandwidth covering 0.63 octaves.
- Correlation of sideband coherence with multiphoton ionization of NO.
Conclusions:
- The novel Raman technique enables efficient generation of numerous coherent sidebands.
- Phase coherence in visible sidebands is achievable and can be probed via molecular ionization.
- This advancement opens new possibilities for high-resolution spectroscopy and coherent control.