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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.

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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.

Keywords:
bidirectional dual-path ring cavityhigh-coherence beat frequencyseparable dual frequencysingle frequency

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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.