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Cited by 70 publications
(48 citation statements)
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“…Frequency tuning of the laser line up to 20 GHz for specific resonating modes is demonstrated. Finally, it is worth mentioning that, once compared with THz QCL VEC-SELs 55,56 , our Octonacci lasers provide a very efficient technological solution to achieve a proper combination of a large bandwidth and a high peak pulse power; however, Each spectrum is acquired with a mirror position shift of 18 µm, and the intensity of the spectral lines is normalized, as described by the lateral colour bar. The red lines show the external cavity (comprising the top laser surface and the external mirror) frequency ν cav as a function of the mirror position d. e Contour plot of the quality factor of the simulated resonating modes for the device with W = 160 µm and L = 1.9 µm in the presence of a mirror at a distance d in the 10 μm-150 µm range.…”
Section: Discussionmentioning
confidence: 99%
“…Frequency tuning of the laser line up to 20 GHz for specific resonating modes is demonstrated. Finally, it is worth mentioning that, once compared with THz QCL VEC-SELs 55,56 , our Octonacci lasers provide a very efficient technological solution to achieve a proper combination of a large bandwidth and a high peak pulse power; however, Each spectrum is acquired with a mirror position shift of 18 µm, and the intensity of the spectral lines is normalized, as described by the lateral colour bar. The red lines show the external cavity (comprising the top laser surface and the external mirror) frequency ν cav as a function of the mirror position d. e Contour plot of the quality factor of the simulated resonating modes for the device with W = 160 µm and L = 1.9 µm in the presence of a mirror at a distance d in the 10 μm-150 µm range.…”
Section: Discussionmentioning
confidence: 99%
“…A promising candidate is the THz quantum cascade laser (QCL) [11], a unipolar device based on intersubband transitions within the conduction band of an electrically pumped semiconductor heterostructure. The state-of-the-art devices have emission bandwidths of 1-5 THz [12,13], Watt-level power on a single mode [14] and operate up to 210 K in pulsed mode [15]. Recent developments in the field of optical sensing by means of frequency combs in the THz [16] and mid-infrared [17] spectral regions has gained a lot of attraction.…”
Section: Introductionmentioning
confidence: 99%
“…However, the mismatch between the mode in the deeply sub-wavelength-thick waveguide and that in the free space degrades severely the output power and the beam directionality. A number of unique photonic concepts have been developed to resolve this issue [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. For examples, THz quantum cascade wire lasers, exploiting a third-order distributed feedback (DFB) grating, exhibited low-divergence beam emission [16].…”
Section: Introductionmentioning
confidence: 99%
“…In addition, cavity configurations such as hybrid Bragg gratings, or graded photonic heterostructures, were exploited to excite a symmetric mode with high radiation efficiency, which resulted in pulsed output power in hundreds of milliwatt [22][23][24][25][26]. Very recently, quantum cascade metasurface-based vertical-external-cavity surface emitting lasers realized watt-level output power and a large range of frequency tuning [27][28][29][30][31].…”
Section: Introductionmentioning
confidence: 99%