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Updated: Dec 27, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Ultrastable Offset-Locking Continuous Wave Laser to a Frequency Comb with a Compound Control Method for Precision

Ruitao Yang1,2,3, Haisu Lv1,2, Jing Luo1,4

  • 1Institute of Ultra-precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, Harbin 150001, China.

Sensors (Basel, Switzerland)
|February 29, 2020
PubMed
Summary
This summary is machine-generated.

A new control system precisely locks a continuous wave (CW) laser to an optical frequency comb. This method enhances laser frequency stability for advanced applications like laser interferometry.

Keywords:
acousto-optical frequency shiftercompound controlfrequency lockingoptical frequency comb

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Area of Science:

  • Physics
  • Optical Engineering
  • Metrology

Background:

  • Precise frequency control of lasers is crucial for advanced scientific instruments.
  • Existing methods for locking lasers to optical frequency combs face limitations in bandwidth and stability.

Purpose of the Study:

  • To develop a simple and robust system for ultrastable frequency control of a slave continuous wave (CW) laser.
  • To lock the CW laser's frequency to an optical frequency comb with high precision.

Main Methods:

  • Implemented a compound control system combining analog feedforward and digital feedback.
  • Utilized an acousto-optical frequency shifter (AOFS) for frequency dithering compensation.
  • Employed a digital feedback loop to overcome AOFS bandwidth limitations.
  • Optimized signal-to-noise ratio using a grating-based spectral filtering detection unit.

Main Results:

  • Achieved ultrastable offset-locking of the CW laser to the frequency comb.
  • Demonstrated a relative stability of ±3.62 × 10-14.
  • Recorded Allan deviations of 8.01 × 10-16 (10 s) and 2.19 × 10-16 (1000 s).

Conclusions:

  • The developed system offers a simple, robust, and effective method for ultrastable laser frequency control.
  • This technique can significantly improve the performance of laser interferometry and other precision measurement systems.
  • The expanded operational bandwidth and high stability pave the way for new scientific discoveries.