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Analysis of fringe locking in a laser diode interferometer under injection-current modulation
Optics Letters
|December 12, 2007
Summary
A theoretical analysis explains fringe-locking in laser diode interferometers. Wavelength changes due to injection current modulation are suppressed in longer path difference interferometers, matching experimental results.
Area of Science:
- Optics and Photonics
- Laser Physics
- Interferometry
Background:
- Laser diodes are susceptible to optical feedback, affecting their stability.
- Interferometers are sensitive optical instruments that can exhibit fringe-locking phenomena.
Purpose of the Study:
- To theoretically explain the fringe-locking phenomenon in a two-beam interferometer with a laser diode.
- To analyze the impact of optical feedback and injection current modulation on interferometer fringe phase.
Main Methods:
- Developed a theoretical model of coupled resonators (laser cavity and interferometer).
- Calculated the dependence of wavelength change on injection current variation.
- Derived the fringe phase change resulting from injection current modulation.
Main Results:
- The model predicts suppression of fringe phase change for interferometer path differences exceeding 10 mm.
- Calculated phase fluctuations show good agreement with experimental observations.
- Wavelength change is directly related to injection current variation.
Conclusions:
- The coupled resonator model accurately describes fringe-locking in modulated laser diode interferometers.
- Interferometer path length is a critical factor in suppressing phase fluctuations.
- Theoretical predictions align with experimental fringe-locking behavior.
