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.
A unique feature of Quantum Cascade lasers is the possibility to stack active regions. Using a three stack heterogeneous Quantum Cascade laser ultra broadband amplification and short pulse generation is demonstrated. High power output is achieved by two stacked symmetric active regions.
By introducing side-absorbers to metal-metal waveguides of broadband terahertz quantum cascade lasers, we are able to control and completely suppress higher-order lateral waveguide modes. This change leads to an octave spanning laser spectrum with a 600 GHz wide flat top. In addition, the absence of higher order lateral modes has a strong effect on the pulse generation of injection seeded QCLs. We...
We present a terahertz quantum cascade laser providing 875 mW two-facet output power in pulsed mode, at a frequency around 4.7 THz and at a heatsink temperature of 10 K. The laser has a single plasmon waveguide. The active region is based on four quantum wells with longitudinal optical phonon extraction.
Quantum Cascade Lasers (QCL) [1] are readily used sources in the mid-infrared serving mostly spectroscopic purposes, but also countermeasures and medical applications. For many of these purposes a single mode emission at a previously determined wavelength is required. This can be achieved for instance by adding Distributed-Feedback (DFB) [2] into the emitter. One approach to generate a DFB QCL is...
We present the use of a third order distributed feedback waveguide for double metal THz quantum cascade laser as a successful design to obtain high slope efficiency of 50 mW/A, spectral emission control and narrow single lobed far field (5degtimes 8deg).
We present a terahertz quantum cascade laser based on InGaAs/InAlAs/InP material system with double metal waveguide that reaches operating temperature of 123 K with continuous wave power output 4.5 mW at 10 K and slope efficiency comparable to GaAs/AlGaAs counterparts.
This presentation will give a brief overview on on-the-flow analyte detection based on native fluorescence spectroscopy. This is a very promising approach that does not require specific binding or tagging of the analyte. However, the variety of cells is large compared to the number of basic molecular building blocks. Therefore, the fluorescence spectra of different species are often very similar,...
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.