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We track the collective terahertz free-carrier response of 1T-TiSe2 during femtosecond photo-induced melting and recovery of a charge density wave. The formation of charge order is highly sensitive to the transient excess carrier density, suggesting a strong excitonic influence.
Down-conversion from a THz beat generated by a two-frequency solid-state laser to a RF intermediate frequency is performed with a zero dispersion-slope fiber. The two interleaved four-wave mixing spectra contain more than 75 harmonics.
We present the laser architecture that will be constructed as a pump laser for a Multi-TW OPCPA component test laboratory using glass rod amplifiers and a regenerative amplifier seeded by a modulated fiber laser source.
Coherently injection-locked and directly modulated WRC-FPLD for optical 16-QAM/122-subcarrier OFDM transmission at 1.5625GHz central carrier over 25km is demonstrated to achieve 12.5Gbit/s bit-rate with receiving sensitivity of −7dBm at BER of 1 × 10−7.
The high repetition rate laser systems providing the ELI-ALPS facility with TW-to-PW peak intensity pulses are designed to generate secondary light sources with a duration of tens of attosecond for basic and applied researches.
10ns pulses with 9.1mJ energy at 5 kHz repetition rate and in a diffraction-limited output beam are generated by a nanosecond-pulsed fiber amplifier system based on 35μm and 55μm core Yb-doped Chrially-Coupled-Core (CCC) fibers.
The instantaneous frequency of a chirped pulse is directly measured by combining spectral and temporal interferometry, allowing for characterization of the stretcher of a chirped-pulse-amplification system over several nanoseconds with picosecond precision.
A wide range wavelength and repetition rate tunable tens of GHz sub-picosecond pulse source is demonstrated based on optical modulators. A wavelength tunable range of 1530–1575 nm and a repetition rate tunable range of 18–26 GHz were achieved.
The talk will focus on advances in high power single longitudinal/transverse mode master oscillator power amplifier (MOPA) QCls and MOPA QCL arrays capable of broadband tuning, as well as on low-divergence high brightness plasmomic QCLs
We demonstrate detection and ranging of various targets, including aerosols, gas spectral signatures and translucent sample thickness using dual comb interferometry. Highresolution hyperspectral traces are obtained from targets at a distance of 175 m.
Record transmissions with the direct modulation of a 1550nm-hybrid III/V-on-Silicon laser of 21.5Gbps in optical back-to-back (B2B) and 12.4Gbps over 50km of Single-Mode Fiber (SMF) are achieved. Neither optical amplification, nor optical dispersion-compensation is used.
Spectrally efficient dual-comb detection is utilized for self-referenced measurements of spectral phase of three distinct semiconductor frequency combs. The higher-order phase is quantified for each, elucidating the dispersive properties of the gain and fiberized cavities.
All-optical clock recovery for 40 Gb/s NRZ-QPSK signals is demonstrated experimentally using an amplified feedback DFB laser. Low timing jitter (<370 fs) optical clock is obtained with low injection power (<6 dBm).
We present a wavelength and pulse width agile programmable laser in the 1 μm region using Ytterbium-doped fiber amplifiers. Wavelengths and pulse widths are tuned independently from 1020 to 1080 nm and from 26 down to 4 ps after compression.
We study the signal enhancement at 1.53 μm in a high Erbium concentration, long lifetime single-crystal Erbium Chloride Silicate (ECS) nanowire. 644 dB/cm signal enhancement is measured from a single ECS nanowire via pump-probe method.
We present the design and progress towards implementation of a femtosecond fiber timing distribution system for the Linac Coherent Light Source at SLAC enabling machine diagnostic at the 10 fs level.
By mixing three nearly-even-spaced optical frequencies generated by coupled optical parametric oscillators based in KTP stacks and bulk KTP in a nonlinear medium, we demonstrate coherent interference of THz waves.
We demonstrate 40-Gb/s OFDM-PON based on polarization interleaving (PI) and 64-QAM modulation. The bandwidth requirement of components is reduced using the PI scheme and high-order modulation, achieving high-speed transmission.
Employing parametric amplification in the Fourier domain rather than in time domain circumvents phase mismatch and damage threshold limitations of laser amplifiers and enabled CEP stable, 1.43mJ, sub-two cycle pulses at 1.8μm.
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