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All-fiber-device-coupled compact, transportable ultra-stable laser
1Science and Technology on Metrology and Calibration Laboratory, Beijing Institute of Radio Metrology and Measurement, Beijing 100854, China.
The Review of Scientific Instruments
|April 4, 2023
Summary
Compact, transportable ultra-stable lasers are now available for non-laboratory use. This new laser system achieves a fractional frequency instability below 4 × 10-15, enabling high-precision measurements outside the lab.
Area of Science:
- Physics
- Optical Engineering
- Metrology
Background:
- Growing demand for portable, high-performance laser systems for field applications.
- Need for ultra-stable lasers that maintain precision outside controlled laboratory environments.
Purpose of the Study:
- To develop and characterize a compact, transportable ultra-stable laser system.
- To demonstrate robust performance and simplified alignment for non-laboratory operation.
Main Methods:
- Assembly of an optical system using fiber-coupled devices within a cabinet.
- Implementation of a five-axis positioner and adjustable fiber collimator for beam alignment.
- Design of a robust support structure for transportation integrity.
Main Results:
- Achieved a linewidth of 1.4 Hz within 1 second.
- Demonstrated fractional frequency instability better than 4 × 10-15 for averaging times of 1-100 seconds.
- Performance close to the thermal noise limit of the high-finesse cavity.
Conclusions:
- The developed laser system meets the requirements for transportable, ultra-stable laser operation.
- The design facilitates simplified integration and alignment, crucial for field deployment.
- The system offers high precision comparable to laboratory-based systems.
