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High density fringes and phase behavior in birefringence dual frequency laser with multiple feedback
Zhaoli Zeng1, Shulian Zhang, Yun Wu
1State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China.
Optics Express
|March 16, 2012
Summary
This study introduces high-density fringes in birefringent dual frequency lasers using external feedback. Asymmetric feedback significantly boosts fringe density, enhancing optical feedback interferometer resolution.
Area of Science:
- Optics and Photonics
- Laser Physics
- Interferometry
Background:
- Birefringent dual frequency lasers are crucial for optical sensing.
- External cavity feedback is a known method to modulate laser output.
- Previous studies have not explored high-density fringe generation in this specific laser system.
Purpose of the Study:
- To investigate high-density intensity fringes and phase behavior in a birefringent dual frequency laser with multiple feedback.
- To analyze the impact of symmetric and asymmetric external cavity feedback on fringe characteristics.
- To explore the potential for enhanced resolution in optical feedback interferometers.
Main Methods:
- Experimental setup involving a birefringent dual frequency laser with an external cavity.
- Adjustment of feedback mirror tilt angle for asymmetric feedback.
- Observation and analysis of output intensity fringes and phase differences.
- Theoretical analysis to complement experimental findings.
Main Results:
- High-density fringes composed of bipolar pulses observed with symmetric feedback.
- Cosine-like fringes with significantly higher density (approx. 22x conventional) achieved via asymmetric feedback.
- A tunable phase difference between fringes was demonstrated, dependent on external cavity length.
Conclusions:
- The study presents the first demonstration of high-density fringes in birefringent dual frequency lasers with external feedback.
- Asymmetric feedback offers a substantial increase in fringe density, improving interferometer resolution.
- The findings pave the way for advanced optical feedback interferometry with enhanced precision.
