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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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Cold Beam Optical Clock with Multifrequency Spectroscopy.

William G Tobias^1,2, Bryan Hemingway², Steven Peil²

¹Computational Physics, Inc., 8001 Braddock Road, Suite 210, Springfield, Virginia 22151, USA.

Physical Review Letters

|February 14, 2025

Summary

This summary is machine-generated.

We developed a compact optical clock using laser-cooled calcium-40 atoms. This improved atomic clock performance by enhancing fringe amplitude and reducing frequency uncertainty.

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Area of Science:

Atomic Physics
Optical Clocks
Spectroscopy

Background:

Optical clocks require precise atomic interrogation.
Ramsey-Bordé interferometry is a key technique for atomic clocks.
Laser cooling significantly enhances atomic sample quality.

Purpose of the Study:

To demonstrate a compact optical clock using laser-cooled ^{40}Ca.
To improve the performance of Ramsey-Bordé interferometry in atomic clocks.
To achieve high precision and stability in an optical clock.

Main Methods:

Utilizing laser cooling to reduce the velocity of ^{40}Ca atoms.
Employing Ramsey-Bordé interferometry with a compact setup.
Implementing tailored phase and intensity modulation for spectroscopy.

Main Results:

Achieved sub-kHz linewidth fringes due to reduced atomic velocity and temperature.
Increased Ramsey-Bordé fringe amplitude by a factor of 14.
Reached an Allan deviation of 3.4×10^{-15} at one second averaging time.

Conclusions:

Laser-cooled ^{40}Ca beams enable high-performance compact optical clocks.
Optimized spectroscopy techniques significantly enhance clock signal quality.
The demonstrated clock shows potential for precise timekeeping and frequency standards.