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Enhancement of 300times in third harmonic generation conversion efficiency for ultrafast laser pulses in gases is demonstrated. The enhancements are obtained by generating a spatially-localized plasma in the focal region of an ultrashort pulse.
We demonstrate lensless diffractive microscopy with 92 nm resolution using 13.5 nm light from high harmonic generation. Fast image retrieval with Fourier transform holography is shown, and we present paths to refining the images to higher resolution.
Precise control of the carrier-envelope phase of Raman generated ultrashort pulses is achieved by generating a Raman frequency comb using an infrared laser pulse and its second harmonic to drive the Raman coherence.
The first VCSEL-based O2 sensor for gas/oil furnace applications employing a diffuse reflector is presented which circumvents alignment and interference problems. Optimized data processing is used for long-term stable operation and allows for real-time measurement.
We demonstrate a ~1 GHz femtosecond optical parametric oscillator synchronously pumped by a 76-MHz Ti:sapphire laser using a cavity longer than the fundamental synchronous cavity length. Near-transform-limited pulses with average durations of 227 fs are generated.
10 GHz optical pulses are generated by line-by-line phase compensation on an optical frequency comb. Residual pulse timing jitter les 10 fs and high power signals at harmonics up to 80 GHz are measured.
The kinetic energy release of the D+ fragment ion from D2 molecule is measured using an interferometric autocorrelation technique. The interference fringes of the omega, 3omega, and 5omega fields emerge on the D+ fragment signals.
By two-color pumping and a small pressure induced shift we demonstrate, it is possible to substantially increase the number of X-ray laser schemes reachable for seeding with high-order harmonics created by a Nd:glass laser system.
A slow increase of the amplitude and frequency of a mechanical harmonic oscillator leads to squeezing effects, which are related to the use of the adiabatic approximation. An order of magnitude for this squeezing is calculated and it is suggested to use the present theory for mechanical oscillators in traps and for resonant detectors. The other extreme case of 'impact' interaction is analyzed in which...
An Yb-doped fiber laser and amplifier system is used together with an enhancement cavity for high harmonic generation for precision spectroscopy. Higher order harmonics can be produced in comparison to systems with Ti:sapphire lasers.
Interaction of whispering gallery modes in a microsphere with a dipole scatterer is described exactly. The theory disproves the traditional understanding of this phenomenon and explains a real origin of doublets in spectra of microspheres.
The polarization of ultrafast terahertz pulses generated in a laser induced plasma can be controlled by the relative phase of the fundamental and the second harmonic optical fields.
Continuous-wave second harmonic generation in type-I phase-matched AlxGa1-xAs Bragg reflection waveguides is reported. Peak second harmonic power of 3.10 nW was measured for a pump at 1563.5 nm with an internal power of 174 muW.
Real-time second harmonic generation microscopy of live myocytes was achieved with a femtosecond diode-pumped Yb:KGd(WO4)2 laser. Negligible absorption allows for prolonged imaging during muscle contractions with no significant phototoxic effects or signal degradation.
Successful application of recently developed GaSb-based single-mode vertical-cavity surface-emitting lasers for gas-sensing at 2.3 mum is reported. CO and CH4 have been detected simultaneously using wavelength modulation spectroscopy with a multi-line curve fit concept.
By improving the throughput of the 4f system and by increasing the input laser pulse energy, milli-joule level two cycle pulses were produced with a liquid crystal spatial light modulator for the first time.
By tightly focusing a high repetition rate (50 kHz), compact, femtosecond laser system with low pulse energy (25 muJ), we demonstrate fully phase matched, fully spatially coherent, 50 kHz high harmonic beams for the first time.
We report the first HHG in a hollow-core photonic crystal fiber. We generate the 7th-13th harmonic of ap800 nm in xenon. The extremely low threshold of 0.4 muJ would be achievable by multimegahertz solid-state lasers.
We demonstrate a quadratic nonlinear photonic structure that converts a fundamental Gaussian beam to an accelerating Airy beam at the second harmonic. The nonlinear response enables all-optical switching of the beam's acceleration direction.
Double optical gated high-order harmonic supercontinuous spectra were generated in the extreme ultraviolet region including the ldquowater windowrdquo. The spectra supported 16 as pulse durations that are below one atomic unit of time (24 as).
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