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Specimen-induced aberrations frequently affect image quality in high-resolution microscopes. We apply adaptive optics to correct aberrations in two-photon fluorescence, and second and third harmonic microscopes. In particular, this is applied to imaging of mouse embryos.
We demonstrate a novel line scanning multiphoton microscope with a single element detector, potentially allowing fast imaging deep into scattering tissue. Multiphoton biological imaging of ex vivo rat tendon using this technique is presented.
We have developed a novel high-resolution molecular imaging technique, Pump-Probe Optical Coherence Microscopy, based on the fusion of Pump-Probe spectroscopy and Optical Coherence Microscopy and demonstrated it on fixed human skin containing a nodular melanoma.
High-precision three-dimensional woodpile photonic crystal nanocavities with 40 × 55 × 2.25 unit cells are fabricated in GaAs wafer for 1.55 µm wavelength with the two-directional etching method in a simple two-patterning process.
Terahertz pulse generation is demonstrated by a resonant femtosecond interband excitation of the miniband of a quantum-cascade-laser. The laser gain is subsequently used to amplify the terahertz pulse generated as it propagates through the cavity.
We have achieved a very narrow band and strong thermal radiation peak in a design wavelength by using intersubband transitions in quantum wells and two-dimensional photonic crystals.
We report on the operation of a splice-free ytterbium fiber laser emitting 65W at 1072nm based on a pair of FBGs written directly in the active fiber using 400nm femtosecond pulses and a phase-mask.
Photonic Band Gap (PBG) materials [1,2] are artificial, periodic, dielectrics that enable engineering of the most fundamental properties of electromagnetic waves. These include the laws of refraction, diffraction, and spontaneous emission of light. Unlike traditional semiconductors that rely on the propagation of electrons through an atomic lattice, PBG materials execute their novel functions through...
III-Nitride UV light emitting diodes (LEDs) have an enormous applications potential for air & water purification, food disinfection, polymer curing and bio-medical instrumentation. However the growth and processing of these devices is very challenging due to the high Al-fraction AlGaN layers needed for deep UV emission. Since early 2000, our research group has developed III-N deep UV LEDs (emission...
We demonstrate amplification of femtosecond pulses in large mode area singlemode Yb-doped photonic bandgap Bragg fibers. 260 fs 5 µJ pulses are obtained at 100 kHz repetition rate (1 W of average power).
A photonic crystal waveguide delay line is reported with 90ps of tunable delay over a 20GHz bandwidth. This corresponds to a maximum phase shift of 600°. The true-time delay characteristics are evidenced using a vector network analyzer.
We demonstrated novel all-optical signal regeneration using pulse trapping. Amplification, re-timing, and pulse shaping were demonstrated in only a 140 m-long standard low birefringent fiber. A large gain of 20 dB was observed.
When femtosecond laser pulses are focused in the bulk of transparent materials (glasses), deposition of energy on a restricted volume can occur owing to the non linear character of the laser matter interaction. As a consequence, the possibility to generate micrometer-sized structural modifications arises. Those local changes are often associated with a minute variation in the refractive index which,...
Architectures for dynamic reconfiguration of wavelength services are presented in this paper. The approaches are based on Fiber Bragg Gratings (FBG) and optical switching. In particular, the proposed architectures fit for large in-building networks.
We demonstrate residual dispersion and OSNR monitoring from 40Gb/s to 640Gb/s via slow-light enhanced optical THG in dispersion engineered 2D silicon photonic crystal waveguides.
We present a numerical model that explains the pulse compression dynamics occurring in synchronously-pumped Raman oscillators based on transient Stimulated Raman Scattering equations. Excellent agreement is found between our theoretical results and the experimental data.
We show theoretically and experimentally that by adjusting the lattice configuration we are able to manipulate the near-field interaction of resonant particles, and thus tune the response of a lattice of split-ring resonators.
This paper presents a study about output bandwidth maximization in Erbium-doped fiber lasers, by using thin films incorporating Carbon Nanotubes (CNT) with diameters of 0.8 and 1.0 nm, with several films transmittance values and different total cavity dispersion. Best result was achieved with 1.0 nm CNT generating a maximum bandwidth of 5.7 nm when films transmittance is 37%.
We developed a Finite Element package to analyze cladding mode field extensions into the air-holes of photonics crystal fiber for refractive index sensing. Our analysis could determine the most sensitive cladding mode for liquid sensing.
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.
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