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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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Push-pull laser-atomic oscillator.

Y-Y Jau¹, W Happer

¹Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.

Physical Review Letters

|February 1, 2008

Summary

This summary is machine-generated.

Alkali-metal atoms in a semiconductor laser cavity self-modulate the laser at atomic hyperfine frequencies. This generates stable microwave signals without external microwave sources, enabling applications like atomic clocks.

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Published on: February 4, 2017

Area of Science:

Atomic physics
Laser physics
Quantum optics

Background:

Semiconductor lasers can interact with atomic vapors.
Optical pumping can create coherent atomic states.
Atomic hyperfine frequencies are precisely defined quantum transitions.

Purpose of the Study:

To investigate the self-modulation of a semiconductor laser by alkali-metal atoms.
To explore the generation of stable microwave signals from this interaction.
To identify potential applications in precision measurement and quantum technologies.

Main Methods:

Placing alkali-metal vapor in the external cavity of a semiconductor laser.
Using a time-independent injection current to pump the laser.
Analyzing the self-modulated output light and voltage for microwave signals.

Main Results:

Laser self-modulation observed at the field-independent 0-0 frequency of alkali-metal atoms.
Atoms driven into a coherent superposition state (m=0).
Stable microwave signals recovered from modulated laser light and diode voltage.

Conclusions:

This phenomenon offers a novel method for generating stable microwave signals.
Potential applications include highly accurate atomic clocks and coherent optical comb generation.
The system enables the production of long-lived coherent atomic states.