Quantum noise of free-running and externally-stabilized laser diodes
Quantum noise of free-running and externally-stabilized laser diodes
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DOI：
10.1088/1355-5111/7/4/015
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发表时间：
1995-08
期刊：
影响因子：
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通讯作者：
T. Zhang;J. Poizat;P. Grelu;J. Roch;P. Grangier;F. Marin;A. Bramati;V. Jost;M. Levenson;E. Giacobino
中科院分区：
文献类型：
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作者：
T. Zhang;J. Poizat;P. Grelu;J. Roch;P. Grangier;F. Marin;A. Bramati;V. Jost;M. Levenson;E. Giacobino
我们研究了单模激光二极管的强度和相位噪声，无论是自由运行或使用不同类型的线窄化技术，在室温下，即从外部光栅和注入锁定反馈。我们已经测量了在第一种情况下的1.2 dB的强度压缩，和在第二种情况下的1.4 dB（分别为1.6 dB和2.3 dB推断在激光输出）。我们已经观察到，自由运行的“单模”激光二极管的强度噪声实际上是由主模和弱纵边模的大振幅相关波动之间的抵消效应引起的。它还表明，自激二极管表现出非常大的过剩相位噪声。通常在10 MHz时比散粒噪声高80 dB以上，可通过上述技术显著降低散粒噪声。
We have investigated the intensity and phase noise of single-mode laser diodes, either free-running or using different types of line narrowing techniques at room temperature, namely feedback from an external grating and injection locking. We have measured an intensity squeezing of 1.2 dB in the first case, and 1.4 dB in the second case (respectively, 1.6 dB and 2.3 dB inferred at the laser output). We have observed that the intensity noise of a free-running 'single-mode' laser diode actually results from a cancellation effect between large anticorrelated fluctuations of the main mode and of weak longitudinal side modes. It is also shown that free-running diodes exhibit very large excess phase noise. Typically more than 80 dB above shot noise at 10 MHz, which can be significantly reduced by the above-mentioned techniques.