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The fabrication of periodic poled Lithium Tantalate single crystal fibers by the laser heated pedestal growth method were achieved with in-situ monitoring of transient poling current. The whole cross section of the fiber is poled through as seen from the confocal measurement.
We propose a compact and robust laser system for onboard rubidium atomic interferometry usefull for atomic inertial sensors. Our system is based on the second harmonic generation of a telecom fiber bench at 1560 nm.
BiB3O6 has been found to be 90deg phase-matchable for type-I and type-2 chi(3) third-harmonic generation at 0.3263 and 0.3837 mum at 20degC. The improved Sellmeier equations that correctly reproduce the new data are presented.
We report on synchronously pumped OPOs with intracavity SHG or SFG in the same MgO:PPLN crystal. At e.g. 590 nm an output power of 190 mW was obtained with 140 fs pulses at a repetition rate of 81 MHz.
The complete characterization of the 19th harmonic of Ti:sapphire laser was demonstrated using the photoelectron spectral shearing interferometry for the first time. The frequency chirp of a harmonic pulse was sensitively detected by this method.
We propose a novel optical switch to control the high-order harmonic generation process so that single attosecond pulses can be generated with ~10 fs input pulses. The technique combines polarization gating and two-color gating.
We exploit second-harmonic generation with large group velocity mismatch to efficiently convert femtosecond pulses into tunable narrowband picosecond pulses. The temporal shape of the picosecond pulses can be tailored by engineering the aperiodically poled crystal.
For very complex pulses (TBP ~ 100), the XFROG, PG FROG, and SHG FROG pulse-retrieval algorithms converged for 100%, 99%, and 80%, respectively, of the pulses tried in our simulations, which included noise.
We report on a pulsed bulk-fiber source producing a peak power of 100 kW at 100 kHz and an average power of 20 W. An SHG efficiency of 51% was obtained by a LBO crystal.
Extreme-ultraviolet pulses, produced by high-order harmonic generation, have been spectrally selected by a time-delay-compensated monochromator. Temporal characterization has been obtained using cross-correlation method: pulses as short as 8 fs, with high photon flux, have been measured.
We generate high-order harmonics from ablation plasma containing an abundance of nanoparticles. Results show that the use of nanoparticles targets enhances the harmonic intensity, and also shifts the harmonic spectrum in wavelength.
We report on the use of noncollinear third-harmonic generation in thin organic films for ultrafast optical image processing using 80 fs pulses at 1550 nm and compare it with the traditional degenerate four-wave mixing approach.
Ferroelectric fluorides are the key materials for the SHG in the UV/VUV by the QPM technique. Ferroelectric characteristics and large single crystal growth are addressed. UV SHG emission is demonstrated with BaMgF4 QPM devices.
159 mW diffraction limited blue light at 488 nm could be generated in a periodically poled lithium niobate waveguide crystal by frequency doubling of a continuous wave distributed feedback laser diode.
We have developed a cw 5-W 756-nm injection-locked Ti:sapphire laser and generated 1.1-W 378-nm radiation by its frequency-doubling in an external enhancement cavity, which is useful for the selective optical pumping of thalium isotopes.
The phase relation among phase-locked multicolor pulses was measured by interference between dual simultaneous frequency-mixing processes in a thin nonlinear crystal for characterization of Fourier-synthesized waveform.
We measured second harmonic generation in the whispering gallery modes of a microspherical cavity from a monolayer of nonlinear molecules on the sphere surface. Such monolayer is placed with the appropriate configuration for phase matching.
We generated high-order harmonics with self-phase-stabilized near-IR pulses produced by a parametric source. We observed a significant cutoff extension whit respect to 800-nm driving pulses at comparable peak intensity. This result represents a step forward the generation of single attosecond pulses with photon energies exceeding 100 eV.
We observe large vibrationally-induced modulations in high order harmonic conversion in N2O4. We explain this unexpected result as due to the changing electronic structure induced by the vibration, leading to preferential emission at the outer turning point of the vibration.
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