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We show how tailored few-cycle lightwaves with near relativistic intensity (∼1018W/cm2) can be used to control the attosecond electron dynamics of plasma mirrors and to produce beam manifolds of fully synchronized attosecond EUV light pulses.
A novel application of chirped dielectric mirrors for narrow beam focalization is proposed and demonstrated numerically and experimentally. Analogy to temporal dispersion compensation by chirped dielectric mirrors is discussed.
Open-access microcavities are an original approach for lab-on-a-chip optofluidic sensing since they offer a direct access to the confined electromagnetic field. This work describes their basic characteristics for refractive index and nanoparticle sensing.
We demonstrate the coherent combination of two solid-core fibers, which are used for nonlinear spectral broadening followed by temporal recompression. 320 fs input pulses coming from a fiber CPA system are split up and independently broadened in the two spatially separated fibers, hence, limitations of individual fibers are lifted. After recombination and compression, sub-30fs pulses were achieved...
We demonstrate cavity-enhanced HHG with a tailored transverse mode simultaneously allowing for efficient conversion to the XUV and for unparalleled output coupling efficiencies. Due to its purely geometric nature, this method is power scalable.
The entanglement of photons from a biexciton cascade is strongly diminished by exciton fine-structure splitting. We demonstrate an optical feedback mechanism to counteract this loss and to control the photon entanglement.
We generated ultrabroadband coherent infrared pulses by focusing hollow-fiber compressed intense 10-fs pulses in air. We also coherently detected the electric-field profiles in the whole infrared range through the field-induced second harmonic generation in air.
We propose a planar retroreflector composed of two cascaded high contrast periodic structures with slowly varying features. One of the high contrast structures focuses the light while the other reflects it as a concave mirror.
We demonstrate a new two-photon scanned light-sheet microscopy with diffraction-limited thickness and tailorable illumination area from 50×50 µm2 to 500×500 µm2, capable of multi-scale live imaging in one setup.
Initial investigations to alleviate thermal lensing, a fundamental limitation in Raman lasers performance, are reported. An adaptive-optics feedback loop was incorporated into a Nd:YVO4 self-Raman laser demonstrating a 40% Raman output power increase.
We compare dynamical properties of ground and excited state emission from 1.31 µm quantum-dot lasers. Dichroic facet mirrors ensure oscillations at either ground or excited state. Maximum bandwidths observed are 10.51 and 16.25 GHz, respectively.
We present closed-loop adaptive phase compensation of a 1.3 kW solid-state slab laser system. Experimental results demonstrated the beam quality is greatly improved with the proposed adaptive optics system.
We report a high-power graphene mode-locked ceramic Cr:ZnS-laser, producing 3.9 nJ, 140 fs pulses with 45 nm spectral bandwidth at 270 MHz repetition rate, at output power for the first time exceeding 1 W level.
An optical parametric amplifier signal and its unconverted pump are studied as a method of waveform synthesis. Generating broad spectra with self phase modulation to create coherent multi-octave CEP stabilized pulses is discussed.
We report pulse formation and spectral characteristics of a FM mode-locked OPO in the mid-IR. The singly-resonant OPO based on MgO:PPLN, pumped by a cw Yb-fiber laser at 1064 nm, generates 236ps pulses at 80MHz.
We demonstrate an organic polariton condensate that exhibits nonlinear interactions at room-temperature. Upon reaching threshold, we observe a superlinear power dependence, a power-dependent blueshift and the emergence of long-range spatial coherence resulting from polariton interactions.
We experimentally demonstrate that, by varying their diameter, the visible-to-infrared reflectance spectra of arrays of vertical Ge nanowires can be tuned. The results could enable future nanowire-based photodetectors with tailored responsivity spectra.
We report on a purely hard-aperture Kerr-lens mode-locked Yb:YAG thin-disk oscillator delivering 230-W, 11.5-µJ, 330-fs (30 MW) in air. To our knowledge this is the highest average power achieved from KLM oscillators so far.
We report crosstalk measurements among spatially-multiplexed subchannels in a ROADM supporting spatial superchannels. Aggregate crosstalk can reach −23dB when express paths are routed on adjacent fibers, but >6dB improvement results when paths are interleaved.
A 500 µm Cr:ZnSe thin disk gain element was pumped at five different pump diameters. Laser output versus pump power was measured. Slope efficiency, threshold, and maximum power versus pump spot size were then extracted.
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