Question about power broadening

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SUMMARY

The discussion centers on the concept of power broadening in laser-atom interactions. When a laser with a fixed linewidth of 1 MHz is directed at an atomic ensemble with a Doppler broadened linewidth of 10 MHz, only 10% of the atoms interact with the laser. Increasing the laser power results in power broadening, effectively increasing the linewidth to 10 MHz, which allows the laser to interact with all atoms in the cell. This phenomenon highlights the relationship between laser power and atomic interaction in quantum optics.

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  • Understanding of Doppler broadening in atomic ensembles
  • Knowledge of laser linewidth and its implications
  • Familiarity with quantum optics principles
  • Basic concepts of power broadening in spectroscopy
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Physicists, optical engineers, and researchers in quantum optics who are exploring laser interactions with atomic systems and the effects of power broadening on transmission characteristics.

kelly0303
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Hello! If I have an atomic ensemble (say in a cell) with a Doppler broadened linewidth of 10 MHz and I have a laser of fixed linewidth of 1 MHz. If I keep the laser frequency fixed on the center of the atomic transition (say that I measure the laser transmission), I would see a peak of 1 MHz linewidth, but only 10% of the atoms will interact with the laser (I assume that anything beyond 1 linewidth doesn't interact just to simplify the question). If I increase the power of the laser a lot, I will have power broadening. If that makes the effective linewidth 10 MHz, does it mean that now I would see a transmitted line of 10 MHz linewidth and the laser will interact with all the atoms in the cell? Thank you!
 

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