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Limitations of diode laser sources in fiber interferometer sensor systems

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Abstract

The use of integrated optical techniques in interferometer sensor systems requires a semiconductor laser source with low noise and highly stable spectral qualities. For the most part single-mode semiconductor laser sources are available with free running amplitude noise characteristics comparable with single-mode He-Ne gas lasers.1 Typically diode lasers oscillate on a line less than 100 MHz wide with higher-order longitudinal modes 2 or more orders of magnitude lower in amplitude.2

© 1981 Optical Society of America

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