Matches in SemOpenAlex for { <https://semopenalex.org/work/W3008100034> ?p ?o ?g. }
Showing items 1 to 79 of
79
with 100 items per page.
- W3008100034 abstract "Widely-tunable room-temperature, electrically-pumped semiconductor sources in 1-5 THz spectral range are highly desired for spectroscopy and imaging application. THz sources based on intra-cavity difference-frequency generation (DFG) in dual wavelength mid-infrared quantum cascade lasers (QCLs) [1-3] with Cherenkov phase-matching [4] are currently the only monolithic room-temperature semiconductor devices that can operate and provide widely-tunable output in this entire spectral range and beyond [5-7]. We will present our latest results on the development of broadly-tunable THz systems based on this technology. Both monolithic and external cavity configurations are explored. In our external-cavity systems we fix one mid-IR pump frequency by a distributed feedback grating etched into the QCL waveguide and tune the second mid-IR pump frequency with an external grating in a Littrow-type configuration. Due to strong spatial hole burning in QCLs, gain competition between the two mid-infrared pumps is reduced and, with careful balancing of the feedback for the mid-infrared pumps, simultaneous two-color emission can be achieved experimentally. External-cavity THz DFG-QCL systems demonstrate continuous tuning at room temperature from 1.2 THz to 5.9 THz with THz peak power output varying between 5 and 90 W, depending on the operating frequency [5,6]. Beam steering of terahertz Cherenkov emission with frequency is suppressed by bonding devices onto high-resistivity silicon substrates that have virtually no refractive index dispersion and vanishingly-small optical loss in 1-6 THz range. To reduce the size and avoid mechanical complexity of external cavity tuners, we also demonstrate monolithic room-temperature THz DFG-QCL tuners with a tuning range from 3.44 THz to 4.02 THz, which corresponds to 15% of their center frequency. Devices are based on a single ridge-waveguide DFG-QCL source with electrically-separated distributed feedback section and distributed Bragg reflector sections that are used to select and tune the frequencies of the two mid-infrared pumps [7]. We have also fabricated an array of 10 of such monolithic THz DFG-QCL tuners that provide continuous tunability between 2 and 4 THz at room temperature with up to 100 μW of peak THz power output." @default.
- W3008100034 created "2020-03-06" @default.
- W3008100034 creator A5014532691 @default.
- W3008100034 creator A5014979782 @default.
- W3008100034 creator A5019819532 @default.
- W3008100034 creator A5029971586 @default.
- W3008100034 creator A5032438351 @default.
- W3008100034 creator A5037914389 @default.
- W3008100034 creator A5050749556 @default.
- W3008100034 creator A5067611841 @default.
- W3008100034 creator A5071175375 @default.
- W3008100034 creator A5071593078 @default.
- W3008100034 date "2015-06-21" @default.
- W3008100034 modified "2023-09-23" @default.
- W3008100034 title "Widely Tunable Room Temperature THz Quantum Cascade Laser Sources" @default.
- W3008100034 hasPublicationYear "2015" @default.
- W3008100034 type Work @default.
- W3008100034 sameAs 3008100034 @default.
- W3008100034 citedByCount "0" @default.
- W3008100034 crossrefType "proceedings-article" @default.
- W3008100034 hasAuthorship W3008100034A5014532691 @default.
- W3008100034 hasAuthorship W3008100034A5014979782 @default.
- W3008100034 hasAuthorship W3008100034A5019819532 @default.
- W3008100034 hasAuthorship W3008100034A5029971586 @default.
- W3008100034 hasAuthorship W3008100034A5032438351 @default.
- W3008100034 hasAuthorship W3008100034A5037914389 @default.
- W3008100034 hasAuthorship W3008100034A5050749556 @default.
- W3008100034 hasAuthorship W3008100034A5067611841 @default.
- W3008100034 hasAuthorship W3008100034A5071175375 @default.
- W3008100034 hasAuthorship W3008100034A5071593078 @default.
- W3008100034 hasConcept C107816215 @default.
- W3008100034 hasConcept C120665830 @default.
- W3008100034 hasConcept C121332964 @default.
- W3008100034 hasConcept C185592680 @default.
- W3008100034 hasConcept C192562407 @default.
- W3008100034 hasConcept C200687136 @default.
- W3008100034 hasConcept C2776957298 @default.
- W3008100034 hasConcept C2777813233 @default.
- W3008100034 hasConcept C34146451 @default.
- W3008100034 hasConcept C43617362 @default.
- W3008100034 hasConcept C49040817 @default.
- W3008100034 hasConcept C520434653 @default.
- W3008100034 hasConceptScore W3008100034C107816215 @default.
- W3008100034 hasConceptScore W3008100034C120665830 @default.
- W3008100034 hasConceptScore W3008100034C121332964 @default.
- W3008100034 hasConceptScore W3008100034C185592680 @default.
- W3008100034 hasConceptScore W3008100034C192562407 @default.
- W3008100034 hasConceptScore W3008100034C200687136 @default.
- W3008100034 hasConceptScore W3008100034C2776957298 @default.
- W3008100034 hasConceptScore W3008100034C2777813233 @default.
- W3008100034 hasConceptScore W3008100034C34146451 @default.
- W3008100034 hasConceptScore W3008100034C43617362 @default.
- W3008100034 hasConceptScore W3008100034C49040817 @default.
- W3008100034 hasConceptScore W3008100034C520434653 @default.
- W3008100034 hasOpenAccess W3008100034 @default.
- W3008100034 hasRelatedWork W1988257480 @default.
- W3008100034 hasRelatedWork W2000243242 @default.
- W3008100034 hasRelatedWork W2024145848 @default.
- W3008100034 hasRelatedWork W2046992276 @default.
- W3008100034 hasRelatedWork W2073698279 @default.
- W3008100034 hasRelatedWork W2074042917 @default.
- W3008100034 hasRelatedWork W2081857272 @default.
- W3008100034 hasRelatedWork W2151455225 @default.
- W3008100034 hasRelatedWork W2162243810 @default.
- W3008100034 hasRelatedWork W2168589523 @default.
- W3008100034 hasRelatedWork W2277303085 @default.
- W3008100034 hasRelatedWork W2611057633 @default.
- W3008100034 hasRelatedWork W2898975254 @default.
- W3008100034 hasRelatedWork W2958329510 @default.
- W3008100034 hasRelatedWork W2966983764 @default.
- W3008100034 hasRelatedWork W2971997894 @default.
- W3008100034 hasRelatedWork W2981630743 @default.
- W3008100034 hasRelatedWork W2982193695 @default.
- W3008100034 hasRelatedWork W3008857313 @default.
- W3008100034 hasRelatedWork W2823954549 @default.
- W3008100034 isParatext "false" @default.
- W3008100034 isRetracted "false" @default.
- W3008100034 magId "3008100034" @default.
- W3008100034 workType "article" @default.