Physics

Nonlinear system

Laser

Biology

Operating system

Optics

Semiconductor laser theory

Statistical physics

Artificial intelligence

Random number generation

Control (management)

Synchronization of chaos

Chaotic

Oscillation (cell signaling)

Computer science

Mode (computer interface)

Quantum mechanics

Computer security

Control theory (sociology)

Genetics

Light Science & Applications

Chaotic semiconductor lasers have been widely investigated for generating unpredictable random numbers, especially for lasers with external optical feedback. Nevertheless, chaotic lasers under external feedback are hindered by external feedback loop time, which causes correlation peaks for chaotic output. Here, we demonstrate the first self-chaotic microlaser based on internal mode interaction for a dual-mode microcavity laser, and realize random number generation using the self-chaotic laser output. By adjusting mode frequency interval close to the intrinsic relaxation oscillation frequency, nonlinear dynamics including self-chaos and period-oscillations are predicted and realized numerically and experimentally due to internal mode interaction. The internal mode interaction and corresponding carrier spatial oscillations pave the way of mode engineering for nonlinear dynamics in a solitary laser. Our findings provide a novel and easy method to create controllable and robust optical chaos for high-speed random number generation.

Chaotic microlasers caused by internal mode interaction for random number generation