[PDF] Top 20 Model for a pulsed terahertz quantum cascade laser under optical feedback

... to laser behavior in a number of complex ways, including altering the refractive index and the physical dimensions of the internal laser cavity [13], which in turn alter the lasing emission ...the ... See full document

... Terahertz quantum cascade lasers (THz QCLs) are compact, electrically driven sources of radia- tion in the ∼ 1–5 THz band [1] that hold enormous potential for sensing [2,3] and communication ... See full document

... RAKIC, Aleksander D., LIM, Yah Leng, TAIMRE, Thomas, AGNEW, Gary, QI, Xiaoqiong, BERTLING, Karl, HAN, She, KUNDU, Iman, GRIER, Andrew, IKONIC, Zoran, VALAVANIS, Alexander, DEMIC, Aleksandar, KEELEY, James, LI, Lianhe H., ... See full document

... how feedback strength (as encoded in Acket’s constant C) affects the harmonic content of the SM signal, we repeated the simulations for different values of C representative of three different feedback ... See full document

... a laser is re-injected into the laser cavity by reflection from a remote ...and laser terminal voltage [13, 14] that depend on both the amplitude and phase of the reflected ...mirror laser ... See full document

... developed terahertz frequency quantum cascade lasers that exploit a double-periodicity distributed feedback grating to control the emission frequency and the output beam direction ...provide ... See full document

... field optical microscope (s-SNOM) based on a quantum cascade laser implemented both as source and detector in a self-mixing scheme utilizing resonant quartz tuning forks as a sensitive ... See full document

... SM model to the experimentally acquired signals. The feedback parameter, C, the phase-lag between the acquired signal and the target excitation, the target displacement amplitude, and the laser ... See full document

... voltage under feedback from the THz field reflected from the surface of etched semiconductor samples, while the surface is scanned by a mechanical XY ...three-mirror laser model, we can map ... See full document

... peak optical power seen in the measurements ...the laser under various conditions can be determined—for example, to optimize bandwidth for short-range ...Our model predicts a 3 dB modulation ... See full document

... the feedback level on the electron transport in the device and the resulting variations in the laser voltage and ...transport model the applied field and cavity loss are inputs to the model, ... See full document

... dinal optical (LO) and acoustic phonons (AP), alloy disorder (AD), interface roughness (IFR), ionized impurities (II) and other electrons ...and quantum mechanical ... See full document

... self-mixing terahertz-frequency gas spectroscopy technique using a multimode quantum cascade ...double-metal quantum cascade laser device are used increase the optical ... See full document

... characterising optical guided wave ...speed optical modulators, compact bend designs, power splitters, polarization splitters, polarization rotators, polarization controllers, terahertz devices, ... See full document

... Laser feedback interferometry, also known as SM interferometry, is a coherent sensing scheme that employs a laser as a homodyne ...transceiver. Laser feedback interferometry relies on ... See full document

... the laser frequency through three external cavity resonances in the region where the laser was most sensitive to optical ...the laser ter- minals after 40 × gain (28dB) with a static ... See full document

... From this study, a prediction tool based on density matrix method which enables the computation of the current-voltage (I-V) and optical gain of THz QCL has been successfully developed. Although, the predicted I-V ... See full document

... device optical properties 8,9 , like in random structures 10 ...a laser cavity to engineer the mode frequency and spacing separately, or to control the emission profile independently of the feedback ... See full document

... the optical response of the graphene loaded plasmonic antennas and the response of the graphene ...the optical measurements and yield a range in the device conductivity which, even though overestimated, can ... See full document

... QCL operation is based on intersubband optical transi- tions, between size-quantized states within the conduction band of multiple quantum well type structures. The excited state lifetimes in such systems ... See full document