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What is Laser Frequency Stabilization?
Laser frequency stabilization is the process of reducing and controlling fluctuations in a laser's optical frequency to maintain a highly stable output over time. It is essential when even very small frequency variations can affect the accuracy of measurements, communications, or quantum experiments.
Frequency stabilization is typically achieved by comparing the laser frequency with a stable optical reference and applying feedback to correct deviations.
HOW Laser Frequency Stabilization Works
Laser frequency stabilization works by continuously detecting deviations from a reference frequency and applying corrective feedback to the laser. This feedback loop compensates for disturbances such as temperature variations, mechanical vibrations, and electronic noise.
Frequency reference
The laser is compared with a stable reference, such as an optical cavity, atomic transition, or frequency standard.
Error detection
Any difference between the laser frequency and the reference generates an error signal.
Feedback correction
A control system uses the error signal to adjust the laser, for example through its injection current, temperature, or an actuator affecting the laser cavity, keeping the output frequency locked to the reference.
