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High-Coherence, Physically Separable Dual-Frequency Fiber Laser Based on Bidirectional Dual-Path Ring Cavity.
Shihuai Li1,2, Baibing Ji1,2, Feng Zhu1,2
1State Key Laboratory of Radio Frequency Heterogeneous Integration, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Sensors (Basel, Switzerland)
|April 14, 2026
Summary
This study introduces a novel dual-frequency fiber laser for applications like LiDAR. It overcomes limitations in separating frequency components, offering a practical solution for advanced optical systems.
Area of Science:
- Optics and Photonics
- Laser Technology
- Fiber Optics
Background:
- Dual-frequency lasers are crucial for heterodyne detection, LiDAR, and interferometry.
- Current technologies struggle to separate MHz-scale frequency differences, hindering system performance.
- A need exists for improved dual-frequency laser sources with direct output separation.
Purpose of the Study:
- To present a novel dual-frequency fiber laser.
- To enable flexible switching between single- and dual-frequency operation.
- To facilitate intrinsic physical separation of the two output beams.
Main Methods:
- Development of a dual-frequency fiber laser utilizing a bidirectional dual-path ring cavity.
- Implementation of intrinsic beam routing for physical separation of laser outputs.
- Characterization of laser performance in both single-frequency and dual-frequency modes.
Main Results:
- Achieved Lorentzian linewidths of 1.1 kHz and 1.16 kHz in single-frequency mode.
- Generated a 470 MHz beat signal in dual-frequency mode with a 340.2 Hz 3-dB linewidth.
- Demonstrated a signal-to-noise ratio (SNR) exceeding 70 dB for the dual-frequency output.
Conclusions:
- The proposed dual-frequency fiber laser offers a practical solution for separating frequency components.
- This laser provides a novel and efficient light source for heterodyne detection and LiDAR systems.
- The intrinsic beam routing simplifies the physical separation of dual outputs, enhancing usability.
