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What is Laser Frequency Locking?
Laser Frequency Locking is a technique used to stabilize the optical frequency of a laser by continuously comparing it with a stable frequency reference and correcting any deviations. It enables lasers to maintain a highly stable and precise frequency over time.
Laser frequency locking is essential in applications requiring high frequency stability and low frequency noise, including quantum technologies, optical clocks, spectroscopy, and precision metrology.
HOW Laser Frequency Locking Works
Laser frequency locking works by detecting frequency deviations from a stable reference and applying a feedback correction to the laser. This closed-loop control continuously compensates for frequency fluctuations caused by environmental or intrinsic disturbances.
Frequency reference
The laser is compared with a stable reference, such as an atomic or molecular transition, an optical cavity, or another stabilized laser.
Error detection
A frequency or phase difference between the laser and the reference is detected and converted into an error signal.
Feedback correction
A control system feeds the error signal back to the laser, adjusting parameters such as its current, temperature, or optical cavity length to maintain the desired frequency.
