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Amplified femtosecond laser pulses are coupled through a hollow-core photonic band-gap fiber with efficiencies greater than 98%. Peak power intensities greater than 1014 W/cm2 are achieved inside the fiber core.
The generation method of spatial-dispersion-free optical vortices using polarization singularity due to an axially-symmetric polarizer was proposed and demonstrated with an ultrabroad-band light (~350 to ~1000 nm) and an ultrashort optical pulse (~50 fs).
A delay-bandwidth product of 10.7 is achieved using ultra-fast intraband nonlinearities in semiconductor optical amplifiers to generate fast light. A novel chirped-pulse scheme enhances the fast light effect and generates delays in addition to advance.
Coherent THz pulses at 328.2 mum were generated by mixing two CO2 laser frequencies based on collinear phase-matched difference-frequency generation in GaSe crystals. The highest average output power was measured to be 260 muW.
A compact vacuum-free hard X-ray source based on high-field pulses from a femtosecond fiber laser interacting with nickel in gently flowing helium is demonstrated. Ka X-ray conversion efficiency is 1.7times10-9.
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.
A pulsewidth tunable 10 GHz flat-top pulse train is generated based on the combined action of active mode locking and nonlinear-polarization-rotation pulse shaping. The SMSR is 65 dB and the timing jitter is 145 fs.
Tunable optical combs spanning the 6.5-8.5 mum range are obtained as a result of a difference-frequency-generation process between pulse-trains emitted by an amplified 100 MHz Er-fiber oscillator with unprecedented average power of tens of microwatts.
We propose and demonstrate a modelocked bi-directional VECSEL with a double V cavity configuration. The laser generates 1.04 mum optical pulses with a 0.76 GHz repetition rate and a total average output power of 4 mW.
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.
We present an optimized and automated implementation of the compact Long-Crystal-SPIDER design. The integrated phase-corrections allow for precise pulse reconstruction up to bandwidths of 17 THz and linear chirp detection at bandwidths exceeding 40 THz.
We experimentally demonstrate that the slave laser oscillating on the ground state (GS) or excited state (ES) transitions can be locked through the injection of optical pulses generated via the opposite transition bands, i.e. the ES or GS transition, respectively.
We report the shortest pulses (290 fs) obtained directly from semiconductor lasers. These were achieved using a passively mode-locked semiconductor disk laser with a graded-gap barrier design in the gain section operating near 1036 nm.
The all-optical response of a semiconductor ring laser to two optical injections demonstrates very digital hysteresis with externally controllable switching threshold, enabling the device to be used for all-optical pulse regeneration.
As a pump laser of a Ti:sapphire femtosecond laser, the authors developed high power, high repetition rate and highly stable Yb:YAG thin disk green laser. We achieved 200 kHz, 73 W operation.
We report non-collinear optical parametric amplification in a bulk KTiOPO4 (KTP) crystal generating ultra-broadband near-IR pulses, that cover simultaneously the wavelength region ~1050-1450 nm with a bandwidth Gt2500 cm-1.
We demonstrated the generation of 34-muJ, 14-fs optical pulses with an ultrabroad bandwidth (540-1000 nm) by the use of one angularly-dispersed non-collinear optical parametric amplifier.
We developed a theory to explain record experimental efficiencies of terahertz emission from tilted-front femtosecond laser pulses propagating through electro-optic crystals. This theory predicts optimal pulse parameters and crystal size maximizing the terahertz yield.
We present the first systematic study of recombination dynamics in InAs QD-SESAMs. Decreasing growth temperature and increasing indium coverage reduces the recovery time from 1500 to 24 ps, leading to shorter pulses in modelocked VECSELs.
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