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Optically induced hysteresis in a two-state quantum dot laser.

B Tykalewicz, D Goulding, S P Hegarty

|March 15, 2016

Summary

Optical injection into quantum dot lasers can induce bistability between ground and excited state lasing. This phenomenon, driven by inhomogeneous broadening, results in a hysteresis loop in the laser output.

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Area of Science:

Semiconductor physics
Optoelectronics
Quantum dot devices

Background:

Quantum dot (QD) lasers exhibit complex lasing behaviors, including ground state only, excited state only, or simultaneous lasing.
Understanding and controlling these lasing modes is crucial for advanced photonic applications.

Purpose of the Study:

To investigate the effect of optical injection near the ground state on QD lasers operating in excited state lasing mode.
To demonstrate and analyze the resulting injection-induced bistability and hysteresis in lasing output.

Main Methods:

Experimental optical injection measurements on quantum dot lasers.
Numerical simulations to model the laser dynamics.
Analysis of lasing output spectra and power characteristics.

Main Results:

Optical injection induces bistability between ground state and excited state dominated emission.
A distinct hysteresis loop is observed in the lasing output power.
Experimental results and numerical simulations show excellent agreement.

Conclusions:

Inhomogeneous broadening is identified as the primary physical mechanism responsible for the observed injection-induced bistability.
Optical injection offers a method to control and switch between different lasing states in quantum dot lasers.
The findings provide insights into the fundamental physics governing QD laser operation.