VECSELs have already been successfully used for quantum experiments based on ion and atom systems, where the main desired features are narrow linewidth, low noise, and stability. Here we are exposing the broad tuning capability of the VEXLUM VALO single-frequency laser platform for the resonant excitation of recently developed GaSb-based semiconductor quantum dots, which can provide single-photon emission in the 3rd telecom widow. The VECSEL allows direct excitation of a single quantum dot and elimination of complex charge relaxation paths in the surrounding semiconductor matrix, thus improving the charge stability of the quantum dot.
We present state of the art hybrid integrated GaSb/Si3N4 light sources towards building miniaturized and affordable sensors. Presented laser configurations include: 1) Widely tunable 2.7 µm wavelength laser with 170 nm continuous tuning range. 2) Discretely tunable laser for simultaneously multiwavelength spectroscopy of S2H, H2O and CO2-gasses with greatly simplified calibration procedure compared to conventional tunable lasers. 3) Lasers with ultra-pure spectrum at 2 µm wavelength reaching down to 6 kHz-linewidth towards use in atom spectroscopy or to seed advanced lasers. Used configurations and material systems are wavelength agnostic in 1.9 – 3 µm range and therefore capable to capture wide range of applications. We discuss about applications in environmental and industrial gas sensing and detection of biomarkers such as lactate, urea and glucose.
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