研究目的
Investigating the polarisation properties of a quantum well spin-VCSEL, both without injection and with variable polarisation optical injection, to understand its behavior and potential applications.
研究成果
The study provides insight into the polarisation properties of spin-VCSELs under optical injection, demonstrating two distinct types of responses based on the signs of key parameters. It shows the potential for controlling the VCSEL's polarisation through injection parameters, offering applications in signal processing and telecommunications.
研究不足
The study is limited by the specific design and material properties of the VCSEL used, including its birefringence and dichroism. The experimental setup's sensitivity to alignment and injection power may also affect the reproducibility of results.
1：Experimental Design and Method Selection:
The study involves experimental investigation and theoretical comparison with the spin flip model (SFM) to understand the polarisation properties of a spin-VCSEL under various conditions.
2：Sample Selection and Data Sources:
A dilute nitride quantum well (QW) 1300 nm VCSEL wafer grown at Tampere University of Technology, Finland, was used. The VCSEL was optically pumped and subjected to variable polarisation optical injection.
3：List of Experimental Equipment and Materials:
Equipment includes a packaged 980 nm grating stabilised laser for optical pumping, a polarisation controller, a high NA lens-ended fibre, a fibre polarimeter, an optical spectrum analyser (OSA), and a 1300 nm tunable laser (TL) for injection.
4：Experimental Procedures and Operational Workflow:
The VCSEL was optically pumped above threshold, and the polarisation of the emitted light was measured with and without optical injection. The injection's power, ellipticity, and linear angle were varied to study their effects on the VCSEL's polarisation.
5：Data Analysis Methods:
The experimental results were compared with the SFM model, solved in the time domain using a variable time-step Runge-Kutta method via the Matlab? ode45 function.
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