Fringe Locking in a Laser Diode Interferometer by Optical Feedback During Modulation of Injection Current
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A fringe locking phenomenon in a two beam interferometer using a semiconductor laser subject to optical feedback was, whose injection current is modulated. When a path difference of the interferometer is sufficient, fringes taken by a charge coupled device camera are seen to be stationary and the rms fluctuations of fringe phase is reduced to as low as 0.2ϖ radians from more than 8ϖ radians without the optical feedback. The rms phase fluctuation is independent of frequency and amplitude of the current modulation. The fringe locking has also been observed in the presence of both injection current modulation and piezoelectric transducer mirror vibration.
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- Fringe Locking in a Laser Diode Interferometer by Optical Feedback During Modulation of Injection Current
Volume 6, Issue 2 , pp 100-103
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- laser diode
- injection current modulation
- fringe locking
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