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For controlling non-resonant molecular fragmentation process, simultaneous effect of chirp and polarization of a femtosecond pulse is mutually independent. For multiphoton fluorescence microscopy and optical tweezers with high-repetition-rate lasers, inter-pulse separation and polarization is important.
We present an ultra-broadband optical parametric amplification system based on aperiodically poled Mg:LiNbO3 providing 800 nm bandwidth around 3.4 μm in a 7.4-mm long medium. It delivers 75 fs pulses with 1.5 μJ pulse energy.
A novle tunable broadband optical delay scheme using phase modulation is proposed and experimentally demonstrated. A 2ps Gaussian pulse is frequency-chirped, phase-modulated by a ramp signal and delayed up to 9 times of pulse width.
2-mJ, 600-fs, 1047-nm pulses at a 250-Hz rate from a compact, Yb -doped crystal CPA laser system were achieved. We combine a positive-dispersion-regime oscillator, regenerative amplifier and a hybrid stretcher/compressor based on chirped volume Bragg gratings.
By optimizing two-color laser fields using genetic algorithm where the duration of the generated high-harmonic pulse is directly taken as a target function, we show that an isolated 40 attosecond pulse is created.
We demonstrate synchronized few-cycle 800-nm and 2-μm pulse trains seeded from a single Ti:sapphire oscillator, able to generate scalable, high-energy pulses lasting less than a single electric-field cycle. Such pulses are attractive for high-field physics.
We demonstrate that spatially chirped femtosecond laser pulses overcome previous limitations for the machining of high-aspect ratio features with low numerical aperture beams in optically transparent materials.
Sub-20 fs deep-ultraviolet pulses were generated without a pulse compressor. Our approach allows one to compensate pulse broadening in air and glass appropriately and has a possibility of generating sub-7 fs pulses for ultrafast spectroscopy.
We utilize second-harmonic- and sum-frequency-generation at the objective focus to optimize spectral resolution in a single-fs-laser-source CARS microscope. Chirp-matching provides spectral focusing with a <40 cm−1 resolution between 1200 cm−1–3800 cm−1.
A 10.5-kHz train of 2.5-ns optical pulses with 1.15-nm bandwidth centered at 1053-nm suitable for seeding chirped-pulse amplification is produced in a programmable, all-fiber system through direct phase modulation.
We use a pulse-compression chirp-transform algorithm to generate broadband photonic arbitrary waveforms. A phase-locked loop frequency agile laser provides the needed broadband frequency scans. The experiment operates at the telecom wavelength of 1.5μm.
We experimentally demonstrate a technique to simultaneously monitor transmitter chirp and chromatic dispersion utilizing the first and second optical harmonics of a RZ-OOK data. Monitored results of modulator typical chirp and dispersion of 0∼400-ps/nm are obtained.
Employing closed-form solutions derived for the pump-depletion regime of parametric amplification, we show that application of conformal profile theory to ultrabroadband OPCPA can extend its efficiency, bandwidth, and peak-power capabilities by several hundred percent.
Optical parametric amplifiers using aperiodic quasi-phase-matched gratings offer wide amplification bandwidths and high efficiencies. Parasitic conversion processes and spatiotemporal distortions occur, and we discuss these effects and how they can be suppressed by grating design.
We experimentally demonstrate efficient tunable up-conversion by cascading optical oscillation and wide-band adiabatic sum frequency generation in a single nonlinear crystal, yielding red light tunable over a 6.2nm wavelength band.
The temporal reciprocity of chirped-volume-Bragg-grating stretchers and compressors is shown to depend on the bandwidth, length, and index-modulation. Transform-limited pulses can be achieved readily for femtosecond pulses, and also for picosecond pulses using long-length gratings.
We report 57kW of peak power, 4µJ of energy and nonlinear shift of ∼22π at 1MHz repetition rate, the highest from an all-fiber-integrated amplifier, limited by Raman amplification. Numerical simulations provide good agreement with experiments.
High harmonic generation by a strong laser pulse in the presence of a THz pulse is simulated. Consequent spectral extension for different laser wavelengths, and the temporal chirp of the synthesized attosecond pulses are studied.
Using microjoule supercontinuum pulses, two novel SPIDER variants based on the χ(3)-process of self-diffraction are experimentally demonstrated for the first time. The upshift variant appears particularly interesting for ultraviolet femtosecond pulse characterization.
We demonstrate a method to correct the spatial distortion resulting from temporally stretching/compressing optical pulses with a chirped volume holographic grating that enables the practical realization of ultra-compact and efficient chirped pulse amplification laser systems.
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