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17 March 2023 Phase-locked low spatial coherence emission in random quantum cascade lasers for hyperspectral nano-imaging in the THz range
Alessandra Di Gaspare, Eva A. A. Pogna, Valentino Pistore, Elisa Riccardi, Harvey E. Beere, David A. Ritchie, Lianhe Li, Giles A. Davies, Edmund H. Linfield, Andrea C. Ferrari, Miriam S. Vitiello
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Proceedings Volume PC12430, Quantum Sensing and Nano Electronics and Photonics XIX; PC124300A (2023) https://doi.org/10.1117/12.2650560
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
We report the polarization, the interference far-filed pattern, the multimodal spectral emission and the power extraction of the emitted beam from a set of electrically-pumped random quantum cascade lasers in the terahertz range. By integrating, on chip, a non-linear multilayer graphene stack with the laser gain medium, we demonstrate self-induced phase-coherence between the naturally incoherent random modes. We then employ the devised random laser in a detectorless near-field imaging system, exploiting the intracavity reinjection of the laser field via self-mixing interferometry in a confocal microscope for speckle-free tomography with nm-size resolution
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Alessandra Di Gaspare, Eva A. A. Pogna, Valentino Pistore, Elisa Riccardi, Harvey E. Beere, David A. Ritchie, Lianhe Li, Giles A. Davies, Edmund H. Linfield, Andrea C. Ferrari, and Miriam S. Vitiello "Phase-locked low spatial coherence emission in random quantum cascade lasers for hyperspectral nano-imaging in the THz range", Proc. SPIE PC12430, Quantum Sensing and Nano Electronics and Photonics XIX, PC124300A (17 March 2023); https://doi.org/10.1117/12.2650560
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KEYWORDS
Quantum cascade lasers
Spatial coherence
Laser scattering
Nanoimaging
Terahertz radiation
Random lasers
Laser optics
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