[PDF] Top 20 Optical feedback effects on terahertz quantum cascade lasers: modelling and applications

... “Laser feedback interferometry as a tool for analysis of granular materials at terahertz frequencies: Towards imaging and identification of plastic explosives,” Sensors 16(3), 352 ...“Biomedical ... See full document

... condensed into the much shorter timeframe of a single pulse, the idea being to achieve the same adiabatic sweep but in the much diminished timescale of a short pulse. Unlike the sweep in cw mode, however, the pulse ... 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

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

... Quantum Cascade Lasers (QCLs) are powerful intersub- band laser sources operating throughout the mid-infrared (MIR) 1 and terahertz (THz) 2 spectral ...giant optical nonlinearities that ... See full document

... Terahertz-frequency quantum cascade lasers (THz QCLs) are compact solid-state sources of coherent radiation in the 1–5 THz region of the electromagnetic spectrum [1], with output powers in ... See full document

... higher optical gain, lower net electrical power consumption, and higher wall- plug e ffi ...new applications (such as nonlinear optical studies) that require very high instantaneous THz ... See full document

... new applications—more so, con- sidering that laboratory investigation of such behavior can be prohibitively expensive and experimentally challenging due to the extraordinarily short timescales on which some ... See full document

... steady-state optical output power decreases and ceases altogether at ∼53 ...thermal effects take place on a microsecond scale, self-heating during the relatively short 4 ns pulse period may be ignored, ... See full document

... for terahertz (THz) frequency QCLs since the growth of suitably thick dielectric waveguides is ...poor optical mode confinement ...in applications including local oscillators for astronomic ... See full document

... (THz) quantum cascade lasers (QCLs) [1] have stimulated significant interest in the development of imaging systems [2] at THz frequencies owing to their compact size, high output power (>1 W) [3] ... See full document

... surface-emitting terahertz frequency quantum cascade lasers utilising non-uniform second-order distributed feedback ...directional optical power ...ridge-waveguide lasers ... See full document

... (THz) quantum cascade lasers (QCLs) have undergone rapid development since their demonstration, showing high power, broad-tunability, quantum-limited linewidth, and ultra-broadband ...address ... See full document

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

... crystal lasers 18 and edge-emitting third-order (periodic) ...provide optical-feedback and power ...non-periodic feedback gratings have been engineered and investigated in an attempt to ... See full document

... sub-kilohertz quantum-noise-limited linewidths [36] and also offer potential for tunability ...potential applications, namely: multiple-frequency transmission imaging for spectroscopic mapping of materials; ... See full document

... Here, we present the fabrication of THz frequency quantum cascade lasers (QCLs) emitting at 3.5 THz, as well as a new and robust integration scheme. The paper is organized as follows. In section 2, ... See full document

... The QCL used for this study was fabricated in a SP waveguide with ridge dimensions 2.1 mm  140 µm  10 µm. Whilst SP waveguide structures preclude the high-temperature operation possible with MM waveguides, the improved ... See full document

... used in the simulations and the results presented in Fig. 4. A constant etch depth of 9 µm is used in Fig. 4(a), and a ridge width of 10 µm used in Fig. 4(b). The results in the Fig. 4(a) agree with experimental ... See full document

... chemical vapor deposited (CVD) material, that requires the implementation of antennas in order to efficiently focus the light to the device active area. A high efficiency detector operating at room temperature and using ... See full document