High-stability 1.5 mu m external-cavity semiconductor lasers for phase-lock applications
- 1 July 1989
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 1 (7) , 159-161
- https://doi.org/10.1109/68.36024
Abstract
Applications using phase-locked semiconductor lasers, such as homodyne detection, require lasers with narrow linewidth and high-frequency stability. The design and operating characteristics of two 1.5 mu m external-cavity semiconductor lasers built for such applications are described. The measured beat linewidth is 4 kHz, and the spectral density of relative frequency noise deviates significantly from the intrinsic white spectrum only at frequencies below 4 kHz. It is estimated that this frequency jitter will induce approximately 1.1 degrees RMS phase error in a second-order homodyne optical phase-lock loop that is optimized for the present beat linewidth.Keywords
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