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High-frequency intensity modulation in orthogonal polarized dual frequency lasers with optical feedback
Wei Mao1, Shulian Zhang, Ligang Fei
1State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China. maow03@mails.tsinghua.edu.cn
Applied Optics
|November 7, 2006
Summary
High-frequency modulation of laser intensity was achieved using asymmetric optical feedback in a dual-frequency laser. This method enhances optical feedback sensing system resolution through multiple feedback effects and mode competition dynamics.
Area of Science:
- Optics and Photonics
- Laser Physics
- Nonlinear Dynamics
Background:
- External optical feedback can significantly influence laser dynamics.
- Dual-frequency lasers offer unique properties for sensing applications.
- Asymmetric feedback introduces complex behaviors in laser systems.
Purpose of the Study:
- To investigate high-frequency intensity modulation in a dual-frequency laser using asymmetric optical feedback.
- To analyze the impact of external feedback misalignment on laser output.
- To explore the role of mode competition in the observed phenomena.
Main Methods:
- Utilizing an orthogonal polarized dual-frequency laser with a misaligned external feedback reflector.
- Analyzing the fringe frequency and output characteristics of the two polarized modes.
- Employing theoretical modeling and experimental validation.
Main Results:
- Achieved high-frequency modulation of laser output intensity.
- Observed a seven-fold increase in fringe frequency due to multiple feedback effects.
- Demonstrated strong mode competition influenced by the initial intensity difference between orthogonal modes.
Conclusions:
- Asymmetric optical feedback is an effective method for high-frequency laser intensity modulation.
- The observed mode competition dynamics are crucial for understanding laser behavior with feedback.
- High-frequency modulation significantly enhances the resolution of optical feedback sensing systems.
