The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We report our study on the effects of shortened quantum cascade (QC) laser injector regions. While conventional short-wavelength QC lasers typically have around seven or more injector region quantum wells, we investigate QC structures with three and two injector wells. Improvements in threshold currents, output powers, and wall-plug efficiencies are expected for fundamental reasons. At heat sink temperatures...
We study high performing mid-infrared quantum cascade lasers with highly discretized injector regions. We observe negative differential resistance features of ~2V that persist to room temperature and pulse instabilities below 180K.
We demonstrate a quantum cascade laser featuring a low-voltage-defect short injector. Devices showing a voltage-defect as low as 20 meV and voltage efficiency of 88% at 80 K are reported, with > 80% voltage efficiency at room temperature.
A new Quantum Cascade laser design with a ldquotwo-steprdquo coupling between the injector and the active region provides a voltage tuning range of 200 cm-1 for electroluminescence and 80 cm-1 for laser spectra at room temperature.
We report Buried-heterostructure QCLs of lambda~5mum, grown by MOCVD, with extremely low CW room-temperature threshold-current-density of 0.75kA/cm2. Slope efficiencies of 1079mW/A, output power of 116 mW at 288 K and internal loss of 1.84cm-1 have been achieved.
Room temperature, continuous-wave operation of lambda~8.2 mum quantum cascade lasers grown by MOCVD is reported. The lasers have been processed as double-channel ridge waveguides without the need for buried heterostructures.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.