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Related Experiment Video

Updated: Sep 21, 2025

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Modulation-free portable laser frequency and power stabilization system.

Mengke Wang1, Jia Kong1, Jiqing Fu2

  • 1Department of Physics, Hangzhou Dianzi University, Hangzhou 310018, China.

The Review of Scientific Instruments
|June 1, 2022
PubMed
Summary
This summary is machine-generated.

We developed a novel double-locking system to stabilize laser frequency and power simultaneously. This significantly enhances the performance of cesium-4He magnetometers, reducing magnetic sensor noise for improved outdoor applications.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Instrumentation and Measurement Science

Background:

  • Laser instrument performance relies critically on laser source stability.
  • Cesium-4He magnetometers require simultaneous frequency and power stabilization of their pump laser.

Purpose of the Study:

  • To design and implement a compact, double-locking system for simultaneous laser frequency and power stabilization.
  • To apply this system to the pump laser of a cesium-4He magnetometer and evaluate its performance.

Main Methods:

  • Development of a double-locking system with a fiber-coupled output on a small breadboard.
  • Application of the system to the pump laser of a cesium-4He magnetometer.
  • Characterization of laser frequency and power stability using Allan deviation and noise measurements.

Main Results:

  • Reduced laser frequency drift to 10 MHz over 2 hours.
  • Achieved a two-order-of-magnitude improvement in Allan deviation for averaging times > 200 s (σ(τ) = 1.57 × 10⁻⁹ at 200 s).
  • Improved laser power stability to 0.031% over 1.8 hours, approaching detector electronic noise levels.
  • Significantly reduced cesium-4He magnetometer magnetic sensor noise from 0.158 to 0.009 nT.

Conclusions:

  • The developed double-locking system provides significant long-term simultaneous frequency and power stabilization for pump lasers.
  • The stabilized laser system drastically reduces magnetic sensor noise in cesium-4He magnetometers.
  • The compact, on-board design facilitates the development of portable, outdoor magnetometer devices.