Subkilohertz enhanced-power diode-laser spectrometer in the visible

Area of Science:

• Atomic Physics
• Spectroscopy
• Laser Technology

Background:

• Precise laser frequency control is crucial for high-resolution atomic spectroscopy.
• Existing diode-laser systems often face limitations in linewidth, power, or stability.
• Optical resonators are key components for frequency stabilization in laser systems.

Purpose of the Study:

• To develop and characterize a high-performance diode-laser spectrometer.
• To achieve narrow linewidth (<0.6 kHz), enhanced power (up to 40 mW), and low drift (<10 Hz/s).
• To demonstrate the spectrometer's capability in recording time-domain optical Ramsey spectra.

Main Methods:

• Utilized an extended-cavity diode-laser frequency stabilized to a high-finesse optical resonator.
• Employed a broad-area antireflection coated laser diode as an amplifier.
• Ensured a single-lobe emission pattern with good spatial purity from the amplifier.

Main Results:

• Achieved a diode-laser spectrometer operating near 657 nm.
• Demonstrated narrow linewidth (<0.6 kHz), enhanced power (up to 40 mW), and low drift (<10 Hz/s).
• Recorded time-domain optical Ramsey spectra of laser-cooled Ca atoms with 0.6 kHz resolution.

Conclusions:

• The developed diode-laser spectrometer offers superior performance for atomic spectroscopy.
• The system's stability and resolution are suitable for precise measurements of atomic transitions.
• This technology advances capabilities in laser cooling and precision measurements of calcium atoms.