Frequency stabilization of a continuous-wave Ti:sapphire laser

Area of Science:

• Laser Physics
• Optical Engineering

Background:

• Active laser stabilization is crucial for applications requiring precise frequency control.
• Ti:sapphire lasers are widely used in spectroscopy and scientific research due to their broad tuning range.

Purpose of the Study:

• To measure and report the spectral density of frequency fluctuations in an actively stabilized continuous-wave Ti:sapphire laser.
• To evaluate the effectiveness of a specific stabilization technique in reducing laser frequency noise.

Main Methods:

• Utilized an actively stabilized continuous-wave Ti:sapphire laser.
• Employed a servo loop with an intracavity translatable mirror and an external-cavity acousto-optic modulator for frequency control.
• Measured the spectral density of frequency fluctuations.

Main Results:

• Achieved a linewidth of 1.0 kHz root-mean-square (rms) for laser frequency fluctuations within the servo loop.
• Observed a modulation index significantly less than one across most of the Fourier spectrum.
• Indicated operation in a low phase noise domain for electric field fluctuations.

Conclusions:

• The implemented active stabilization technique effectively reduces frequency fluctuations in Ti:sapphire lasers.
• The results demonstrate the potential for achieving highly stable laser frequencies for demanding scientific applications.
• The low phase noise achieved is beneficial for experiments sensitive to frequency and phase variations.