Quantum Cascade Surface Emitting Lasers
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866929557615935488 |
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| author | Stark, David Kapsalidis, Filippos Markmann, Sergej Bertrand, Mathieu Marzban, Bahareh Gini, Emilio Beck, Mattias Faist, Jérôme |
| author_facet | Stark, David Kapsalidis, Filippos Markmann, Sergej Bertrand, Mathieu Marzban, Bahareh Gini, Emilio Beck, Mattias Faist, Jérôme |
| contents | A low-cost single frequency laser emitting in the mid-infrared spectral region and dissipating minimal electrical power is a key ingredient for the next generation of portable gas sensors for high-volume applications involving chemical sensing of important greenhouse and pollutant gases. We propose here a Quantum Cascade Surface Emitting Laser (QCSEL), which we implement as a short linear cavity with high reflectivity coated end-mirrors to suppress any edge emission and use a buried semiconductor diffraction grating to extract the light from the surface. By wafer-level testing we investigate the cavity length scaling, extract mirror reflectivities larger than 0.9, and achieve a pulsed threshold power dissipation of 237 mW for an emission wavelength near 7.5 $μ$m. Finally, we demonstrate single mode emission with a side-mode suppression ratio larger than 33 dB of a 248 $μ$m short cavity mounted with the epitaxial layer up and operated in continuous wave at 20 $^\circ$C. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_05683 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Quantum Cascade Surface Emitting Lasers Stark, David Kapsalidis, Filippos Markmann, Sergej Bertrand, Mathieu Marzban, Bahareh Gini, Emilio Beck, Mattias Faist, Jérôme Optics Applied Physics A low-cost single frequency laser emitting in the mid-infrared spectral region and dissipating minimal electrical power is a key ingredient for the next generation of portable gas sensors for high-volume applications involving chemical sensing of important greenhouse and pollutant gases. We propose here a Quantum Cascade Surface Emitting Laser (QCSEL), which we implement as a short linear cavity with high reflectivity coated end-mirrors to suppress any edge emission and use a buried semiconductor diffraction grating to extract the light from the surface. By wafer-level testing we investigate the cavity length scaling, extract mirror reflectivities larger than 0.9, and achieve a pulsed threshold power dissipation of 237 mW for an emission wavelength near 7.5 $μ$m. Finally, we demonstrate single mode emission with a side-mode suppression ratio larger than 33 dB of a 248 $μ$m short cavity mounted with the epitaxial layer up and operated in continuous wave at 20 $^\circ$C. |
| title | Quantum Cascade Surface Emitting Lasers |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2308.05683 |