We study coherent laser arrays operating in epitaxially grown semiconductor membrane quantum wells. The samples are deposited by transfer on substrates of oxidized silicon and we record the real and reciprocal space of the laser emission. The Laser arrays are in a lateral emission geometry and are waveguides lasers where the end mirrors are the end-facets of the cleaved membranes which usually form cavities in the order of 100 microns. We are able to create waveguide laser arrays with modal widths of approximately 5-10 microns separated by 10-20 microns. We use real and reciprocal space imaging to examine the emission characteristics of the lasing cavity. Remarkably, we discover that the mutual coherence is preserved whether the cavity operates on a single longitudinal mode or multiple modes. We will show how their emission and coherence can be controlled using a digital micromirror device to control the position and shape of the pump illumination studying threshold, coherence and frequency.
We present coherent laser arrays in a silicon photonics compatible waveguide geometry in optically pumped semiconductor membrane quantum well lasers (MQWLs) on oxidised silicon and silicon carbide substrates. Real and reciprocal space imaging is used to investigate the emission of the laser arrays and mutual coherence is seen to be maintained while operating on single and multiple longitudinal modes in each cavity. Further, we investigate writing laser cavity arrays through micro-structuring of the MQWL and also through the utilisation of a spatial light modulator (SLM) to define areas of gain in the MQWL by shaping the pump beam.
Optically pumped waveguide coherent laser arrays are demonstrated in an 1-micron-thick-semiconductor-membrane-InGaAs-quantum-well laser transferred on a silicon carbide heat spreader emitting at 1010 nm. We employ a real and Fourier space imaging setup to study the emission of single and arrays of laser cavities. We are able to create waveguide laser arrays with modal widths of approximately 5-10 μm separated by 5-10 μm which maintain their mutual coherence while operating on either single or multiple longitudinal modes. This laser geometry can be accurately controlled by the laser pump and they offer a new high gain laser platform that permits integration with photonic structures.
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