Pulse Delay Time Statistics in a Superradiant Laser with Calcium Atoms

Area of Science:

• Atomic physics
• Quantum optics
• Laser science

Background:

• Superradiance is a quantum phenomenon where atoms emit light coherently.
• Optical cavities enhance light-matter interactions.
• Calcium atoms in metastable states are suitable for studying quantum phenomena.

Purpose of the Study:

• To observe and characterize superradiant emission from cold calcium atoms.
• To investigate the properties of the emitted pulses, such as intensity and duration.
• To explore the potential for continuous wave laser operation.

Main Methods:

• Preparing cold calcium atoms in the metastable ^{3}P_{1} state.
• Using an optical cavity resonant with the ^{1}S_{0}→^{3}P_{1} intercombination line (657 nm).
• Employing an incoherent pumping scheme to create population inversion.

Main Results:

• Observed superradiant emission of hyperbolic secant shaped pulses.
• Emission intensity was proportional to the square of the atom number.
• Pulse duration was significantly shorter than the natural lifetime of the ^{3}P_{1} state.
• Observed shot-to-shot fluctuations in delay time, matching theoretical predictions.

Conclusions:

• Demonstrated controlled superradiant emission from cold calcium atoms.
• The observed pulse characteristics align with theoretical models of superradiance.
• The incoherent pumping scheme is promising for developing continuous wave laser operation.