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We review recent results on all-optical regeneration of phase encoded signals based on phase sensitive amplification achieved by avoiding phase-to-amplitude conversion in order to facilitate the regeneration of amplitude/phase encoded (QAM) signals.
We present a proof-of-principle of broadband, non-collinear quasi-phase-matching in a hybrid OPCPA system. It employs a combination of quasi-phase-matching and group-velocity-matching in a MgO:PPLN delivering 3.4-µm, 17.2-µJ, 43.1-fs pulses at 50 kHz repetition-rate.
We use ultrafast optical microscopy to investigate carrier dynamics in single flakes of atomically thin molybdenum disulfide. By tuning the probe wavelength through the bandgap, we reveal the influence of layer thickness on carrier dynamics.
We experimentally demonstrate an order of magnitude higher radiated power from a 1550 nm photomixer with plasmonic contact electrodes in comparison with an analogous photomixer without plasmonic contact electrodes in the 0.25–2.5 THz frequency range.
Ultra-intense optical parametric chirped-pulse amplification (OPCPA) requires a high-performance front end at 910 nm. Progress on developing a white-light-seeded chain of noncollinear optical parametric amplifiers (NOPA's) and a cylindrical Offner stretcher is presented.
We present an ultra-broadband OPCPA system operating at 3.4 µm delivering 41.6-fs pulses. The average output power is currently 600 mW, corresponding to 12 µJ of pulse energy at a repetition rate of 50 kHz.
We investigate degradation of QPSK CO-OFDM system due to components most susceptible to high PAPR. We vary transmitter design parameters and uncover appropriate working conditions and clipping effectiveness regions.
We present SBS suppression in a single frequency amplifier using frequency sidebands added by an EOM and complete recovery of the single frequency signal after amplification using a custom high power high modulation index EOM.
Seed pulses at nJ-level of a fiber-based pre-amplified Thulium oscillator are amplified to µJ-level at 1 kHz repetition rate in a regenerative amplifier based on a Thulium-doped YAP crystal with 355 fs compressed pulse duration.
We propose and demonstrate improvement of optical signal-to-noise ratio of a high-power pump by saturated stimulated Brillouin amplification of a backward seed in a fiber. A 27-dB improvement was obtained for a 1-W pump.
We report an all-fiber continuous wave source, tunable between 1935–1980nm, based on parametric conversion combined with thulium amplification. More than 150mW of power and 30dB optical signal-to-noise ratio is obtained over the entire range.
We present FROG characterization of all three amplification channels of a two-stage sub-optical-cycle parametric waveform synthesizer covering more than two octaves in bandwidth. A flexible dispersion compensation scheme will permit compression at the multi-mJ level.
Intensity modulation transfer in saturated amplifiers is simulated for different gains and spatial walk-off configurations. Pump-to-signal walk-off in high-gain amplifiers reduces modulation transfer. Increased transfer occurs at low gains, particularly with idler-only walk-off.
We demonstrate an all-fiber optical parametric amplifier for life-science (OPALS) application. Optical amplification of megahertz serial time-encoded amplified microscopy (STEAM) images with a resolution of less than 2 µm is achieved with a 20-dB gain.
We report on a record 800 nm-to-terahertz energy conversion efficiency of 0.13% at room temperature in LiNbO3 by tilting the pulse intensity front and experimentally studying optimal pumping conditions.
A 1 Gbps 105.4 GHz wireless link is demonstrated by directly modulating a photonic integrated dual-laser source. A 50 m link is predicted to be able to achieve error free operation using FEC following optimisation.
A femtosecond OPA system for mid-infrared ultrafast laser is established. Pulse energy of 17-µJ is obtained from SiC crystal at central wavelength of 3.75-µm, which proves SiC an ideal nonlinear crystal for mid-infrared pulse generation.
We demonstrate transmission of entangled photons through a χ(3)-based 5-km distributed optical amplifier operated in the low-gain limit to offset loss. No measurable degradation in entanglement quality is observed after the amplifier.
We demonstrate highly efficient Terahertz production and absolute phase control in the hardly accessible THz frequency gap by optical rectification in organic crystals leading to single-cycle field oscillations beyond 150 MV/m and 0.5 Tesla.
Recent progress in low-noise optical amplification and signal processing has raised prospects of practical devices operating below the conventional quantum limit. We review basic principles, practical implementation, and performance of such devices.
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