[PDF] Top 20 Coherent imaging using laser feedback interferometry with pulsed-mode terahertz quantum cascade lasers

... and using a variety of detection schemes, including LFI [51, 52], those utilising external detectors [71], and THz Radar ...our pulsed LFI scheme enjoys increased immunity to pixel motion artefacts which ... See full document

... femtosecond lasers using coherent injection seeding [15] and a feedback stabilization/injection locking scheme ...enabled coherent detection of the phase-resolved emission from a QCL in ... See full document

... acquired using a Fourier- transform infrared spectrometer in rapid-scan mode and equipped with a deuterated triglycine sulfate (DTGS) ...in pulsed mode with 200 ns pulses at 50 kHz repeti- ... See full document

... of terahertz (THz) frequency imaging sys- tems based on quantum cascade lasers ...Incoherent imaging systems have been demonstrated using Golay cells, pyroelectric ... See full document

... We show that both the temperature and the current modulation schemes can be used to create LFI interferograms; we then apply the latter to show the effectiveness of the technique by imaging fresh skin tissue from ... See full document

... Quantum cascade lasers (QCLs) are compact semiconductor sources of terahertz (THz) frequency radiation that are capable of emission powers of up to 1 W [1] and maximum operating temperatures ... See full document

... in pulsed mode [32], and 129 K in cw operation [33], which is preferred for coherent detection ...in pulsed mode [34], whereas under cw operation output powers greater than 100 mW have ... See full document

... optical feedback and pulsed operation, which allows prediction and exploration of lasing dynamics in not only applications relying on feedback, such as interferometry, but also applications in ... See full document

... undertaken using THz pulsed imaging (TPI) [4–7, 10, ...Recently, quantum cascade lasers (QCLs) have emerged as the stable, high-power source of choice in the laboratory for ... See full document

... the coherent nature of SM inter- ferometry to demonstrate three-dimensional (3D) profiling of exemplar structures using a THz ...under feedback from the THz field reflected from the surface of etched ... 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 ... 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

... cooled using a continuous flow helium cryostat and maintained at a heat-sink temperature of 25 ± ...the laser was focused onto the sample using a pair of 2-inch-diameter f/2 off-axis parabolic ... See full document

... to imaging applications, as discussed ...K using a helium-cooled continuous-flow cryostat, and driven with 2 µs current pulses at a repetition rate of 10 ...in pulsed mode, making possible the ... See full document

... [1]. Terahertz QCLs are now able to source up to 1 W in pulsed mode [2] and operate at temperatures as high as 200 K in pulsed mode ...operation. Pulsed, as opposed to continuous ... 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 ... See full document

... ridge-waveguide lasers where a linear second- order grating is adopted, because the standing wave modes in the ridge cavities are expressed as sinusoidal ...CCG lasers is comparable with that of ... See full document

... as laser resonators, photonic quasi-crystals open up design possibilities that are simply not possible in a conventional periodic photonic ...injected laser; specifically, we pattern the top surface of a ... See full document

... by using Comsol Multiphysics software and reported in the inset of ...tapping mode, it should be more sensitive to the vertical component of the E-field rather than to the in-plane ...dipolar mode ... See full document

... The derivation of RRE parameters from full REs, fitting of polynomials to RRE data, and calculation of other structure- dependent items indicated in Table I, are a once-off process for each QCL structure. Once done, ... See full document