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Superresolution of pulsed multiphoton Raman transitions
F S Cataliotti1, R Scheunemann, T W Hänsch
1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany.
Physical Review Letters
|September 5, 2001
Summary
We observed higher-order multiphoton Raman resonances in rubidium atoms using two optical frequencies. Narrower spectral widths than predicted were achieved, dependent on laser pulse shape.
Area of Science:
- Quantum optics
- Atomic physics
- Laser spectroscopy
Background:
- Higher-order multiphoton processes are crucial for advanced spectroscopy.
- Controlling spectral linewidths is key to improving measurement precision.
Purpose of the Study:
- Investigate higher-order multiphoton Raman resonances.
- Explore the relationship between spectral width, photon number, and pulse shape.
- Demonstrate narrow resonances in a controlled atomic system.
Main Methods:
- Utilized two pulsed optical frequencies to induce multiphoton Raman transitions.
- Employed laser-cooled rubidium atoms trapped in a CO2-laser optical dipole trap.
- Analyzed spectral widths relative to the Fourier transform linewidth of optical pulses.
Main Results:
- Observed multiphoton transfer involving up to 50 photons with milliwatts of laser power.
- Demonstrated spectral widths significantly narrower than the Fourier transform linewidth.
- Found that transition linewidth dependence on photon number varies with pulse shape.
Conclusions:
- Achieved precise control over multiphoton Raman resonances.
- Highlighted the role of laser pulse shaping in narrowing spectral widths.
- Established a foundation for high-resolution spectroscopy using tailored optical pulses.