Phase chaos laser generation utilizing controlled optical injection and nonlinear phase locking

The signal-to-noise ratio and application of traditional chaotic lasers in phase interferometric scenarios are fundamentally limited by their intrinsic large amplitude fluctuations. This paper proposes and demonstrates a robust method for generating an intensity-stabilized phase chaos laser (PCL) through the controlled optical injection of a chaotic master laser into a slave distributed feedback laser. The PCL is theoretically governed by the interplay between the phase perturbation and intensity stabilization. The operational window is experimentally verified with a 6 times threshold driving current of the slave laser to leverage gain saturation for amplitude stabilization, an injection strength of 2.4% to 3.2% for efficient energy transfer, and a frequency detuning of -0.63 GHz to 3.75 GHz to facilitate nonlinear phase locking. Experiments reveal a dramatically suppressed amplitude fluctuation of 5.4 times reduction in peak-to-peak value, a broadband optical spectrum of around 8.7 GHz linewidth, and a correlation dimension of 4.86. This work provides a comprehensive framework for mastering PCL, paving the avenue for its high-precision phase-correlation applications.