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Frequency stabilization of a semiconductor laser using an external phase modulator.

H Tsuchida, T Iwasaki

|September 29, 2009

Summary

This summary is machine-generated.

This study stabilizes an AlGaAs semiconductor laser

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Area of Science:

Optics and Photonics
Semiconductor Lasers
Laser Stabilization

Background:

Semiconductor lasers often exhibit broad linewidths.
External frequency stabilization is crucial for applications requiring narrow linewidths.

Purpose of the Study:

To reduce the spectral linewidth of an AlGaAs semiconductor laser.
To implement an effective frequency stabilization technique.

Main Methods:

Utilized a titanium-indiffused lithium niobate (Ti:LiNbO(3)) waveguide phase modulator as an external frequency stabilizer.
Employed a ring interferometer as a frequency discriminator.
Developed a wideband servo controller (DC to 30 MHz) integrating feed-forward and feedback control.

Main Results:

Achieved a significantly reduced laser linewidth.
Demonstrated the effectiveness of the combined feed-forward and feedback control strategy.
Obtained a final linewidth of 45 kHz.

Conclusions:

The developed external frequency stabilization method effectively reduces semiconductor laser linewidth.
The combination of a Ti:LiNbO(3) modulator, ring interferometer, and wideband servo controller is a viable approach for laser linewidth reduction.