Optical phase locking with a large and tunable frequency difference based on a vertical-cavity surface-emitting laser.

@article{Chen2008OpticalPL,
  title={Optical phase locking with a large and tunable frequency difference based on a vertical-cavity surface-emitting laser.},
  author={Wenlan Chen and Xianghui Qi and Lin Yi and Ke Deng and Zhong Wang and Jingbiao Chen and Xuzong Chen},
  journal={Optics letters},
  year={2008},
  volume={33 4},
  pages={
          357-9
        }
}
We present a novel method to phase lock two lasers with a controllable frequency difference. A microwave frequency-modulated vertical-cavity surface-emitting laser is used to phase connect two diode lasers by a two-step injection locking. The phase fluctuations of the two lasers are measured to be 6.4 x 10(-4) rad2, corresponding to 99.94% phase coherence. The frequency difference of the two lasers is tunable up to tens of gigahertz. The sideband suppression of the slave laser is more than 30… 

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