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No broadband lasing medium like Ti:Saph has been demonstrated yet for terahertz radiation. We show that laser-aligned molecules can amplify broadband terahertz radiation, allowing high-energy chirped-pulse amplification at terahertz frequencies.
We demonstrate interferometric spectroscopy of high-order harmonic fields with a resolution of the XUV optical period. In addition, we obtain an interferometric fringe of an attosecond pulse train by reconstruction from these harmonic fields.
We obtain expressions for the GVD and TOD of reflection grism compressors for compensating material dispersion, and provide useful approximations for practical grism designs.
We demonstrated passive timing stabilization of mode-locked Ti:sapphire and Yb-fiber oscillators. The timing jitter of two femtosecond laser pulses was 3.2 fs from 10-kHz to 1-Hz integration.
We will discuss the status of high repetition rate high energy femtosecond fiber laser systems, review their scaling potential in terms of average power, pulse energy and peak power. First micro-machining applications demonstrate the potential of this laser technology.
480 fs long pulses with 340 W peak power are generated with an InGaAs diode laser MOPA system and a grating compressor, without stretching the pulses before amplification as required in commonly used CPA systems.
We spectrally broaden a low phase noise Yb-femtosecond similariton fiber oscillator to more than an octave bandwidth. Using the f-2f self-referencing scheme we detect and stabilize its carrier envelope offset frequency.
We present the first solitary mode-locked thin disk oscillator with cavity-dumping. The laser generates pulse energies of 3 muJ with pulse durations below 700 fs at 1 MHz repetition rate.
We demonstrate a diode-pumped Ytterbium ultrashort pulse laser amplifier, avoiding chirped pulse amplification, resulting in a simple and robust laser sources. The average power exceeds 10 W for repetition rates between 50 and 100 kHz.
Generation of low timing-jitter 150-fs pulse trains at 1560 nm with 2 GHz repetition rate is demonstrated by locking a fundamentally mode-locked 200 MHz fiber laser to a high finesse (F=2000) external Fabry-Perot cavity.
Timing jitter characterization of free-running mode-locked lasers is demonstrated using balanced optical cross-correlation in the timing detector and the timing delay configurations. The limitation set by shot noise is 470 attoseconds in 10-MHz bandwidth.
Dynamical properties of mode-locked thin-disk lasers with cavity-dumping are studied with numerical simulations and experimental data. Limitations are identified, design criteria for future systems are deducted, and estimates of possible pulse energies given.
We built an ultra stable coupled optoelectronic oscillator using a slab coupled optical waveguide amplifier, generating pulses at 10.24 GHz with a repetition rate drift of only 513 Hz in 10 minutes without active stabilization.
Femtosecond pulse generation by spectral filtering of a chirped pulse is demonstrated at 1550 nm. An erbium fiber laser with large normal dispersion and a spectral filter generates 200-fs and 1-nJ pulses.
We report the first high-contrast, high-intense Ti:sapphire chirped-pulse amplification laser system incorporating a nonlinear pre-amplifier based on an optical parametric chirped-pulse amplification for use in experiments where relativistic effects dominate the physics.
We present the first comprehensive study of the role of spectral phase on cross-polarized wave generation using sub 30 fs pulses. We derive the acceptable residual phase to define Fourier transformed ultrashort pulses.
An ytterbium fiber oscillator is demonstrated comprising a hollow-core photonic bandgap fiber fusion spliced to single-mode fibers in the cavity generating pulses of 4.1 nJ energy and pulse width of 210 fs.
Following positive laboratory-scale experiments, we investigated the ability to trigger real-scale lightning using ionized filaments generated by ultrashort laser pulses in the atmosphere. Under thunderstorm conditions, we observed electric events synchronized with the laser pulses.
A total output energy exceeding 8 mJ with 50 fs pulse duration has been achieved in the infrared region by power scaling of a parametric amplifier chain, making this source suited as a driver for soft x-ray harmonic pulses.
We simulate the rate equations of nanocavity lasers, introducing gain compression of both the stimulated and spontaneous emission. The resonance frequency and damping are simultaneously enhanced by the Purcell effect, greatly limiting the modulation bandwidth.
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