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Optical phase locking with a large and tunable frequency difference based on a vertical-cavity surface-emitting

Wenlan Chen¹, Xianghui Qi, Lin Yi

¹Institute of Quantum Electronics, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China.

|February 19, 2008

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We developed a new technique to phase lock two lasers, enabling controllable frequency differences up to tens of gigahertz. This method achieves high phase coherence (99.94%) for precise laser control.

Area of Science:

Laser physics
Quantum optics

Background:

Precise control over laser frequency and phase is crucial for advanced optical experiments.
Existing methods for phase locking lasers often have limitations in tunability or coherence.

Purpose of the Study:

To introduce a novel method for phase locking two diode lasers with a controllable frequency difference.
To demonstrate high phase coherence and efficient injection locking.

Main Methods:

Utilizing a microwave frequency-modulated vertical-cavity surface-emitting laser (VCSEL) for phase connection.
Employing a two-step injection locking technique.
Measuring phase fluctuations to quantify coherence.

Main Results:

Achieved 99.94% phase coherence with measured phase fluctuations of 6.4 x 10(-4) rad2.

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Demonstrated tunable frequency differences up to tens of gigahertz.

Obtained sideband suppression of over 30 dB for the slave laser at 30 microW seed power.

Conclusions:

The novel method effectively phase locks two lasers with tunable frequency differences.
The achieved high phase coherence is suitable for advanced applications.
Successfully generated narrow linewidth coherent population trapping spectra in rubidium using the phase-locked beams.