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An all-optical oscilloscope based on high-speed asynchronous optical sampling (ASOPS) is realized. It acquires ultrafast optical signals of 1 ns duration with 160 fs resolution at a 10 kHz scan-rate. THz spectroscopy and picosecond ultrasound based thin film characterization are discussed as applications.
Summary form only given. As robust sources for an increasing number of industrial applications, ultrafast lasers with sub-picosecond pulse duration have experienced a steady growth over the past decades. In this presentation, recent progress of ultrafast laser-based nanoscale material growth and processing will be discussed, along with selected emerging applications of laser-produced nanomaterials...
The authors introduce and study metamaterial superlattices in the form of binary structures of wires and split-ring resonators. The structures are created by sequences of printed circuit boards with split-ring resonators and wires, with the boards are arranged in the form of a superlattice. First, the free space scattering properties of composite structures were experimentally studied by measuring...
In many disordered composite materials, such as paint, powders and biological tissue, light is scattered randomly and the directionality of the light is lost. In these disordered metamaterials, light normally performs a random walk and emerges as a random interference pattern known as speckle. Using continuous wave light with a perfectly matched wavefront, we make these disordered materials focus...
We deliberately control one or several parameters out of the quadruple of imaginary and real parts of permittivity and permeability. Optical magnetism throughout the visible range and dual band negative index metamaterials were discussed.
In this paper, we propose the inorganic nonlinear KTiOPO4 (KTP) crystals of nanometric size with a strong second-harmonic coherent emission when illuminated by femtosecond infrared pulses. The non-resonant character of the nonlinear interaction prevents from any photobleaching or blinking. The signal therefore exhibits a perfect photostability. We show that analysis of coherently emitted non-linear...
We show in this contribution that even in conventional lasers it is incorrect to regard the lasing modes as corresponding to a single resonance of the passive cavity and that multiple spatial frequencies occur even when there is a single lasing frequency close to the frequency of a single passive cavity resonance. These multiple spatial frequencies arise because several CF states contribute to a single...
Herein we show how to use spin coating, a technique widely employed in current optoelectronics technology, to fully process colloidal photonic crystals. We demonstrate that control over every stage of the lattice growth and post-treatment is achievable by using this technique.
Surface plasmon based photonic devices are promising candidates for highly integrated optics. A surface plasmon (SP) is basically an electromagnetic wave confined in the interface between a metal and a dielectric, and is due to the interaction of the electromagnetic field with the surface bounded electron charges in the metal. A SP can propagate along the interface where it is confined (the propagation...
Spatial solitons are localized structures that propagate through nonlinear media keeping their cross section unperturbed due to a balance between diffraction and nonlinearity. When they occur in optical cavities, they are called cavity solitons (CS). We present here a general method to obtain CS in any kind of lasers, including semiconductor lasers. We use the idea of "rocking" to generate...
In the case of gravitational-wave resonant detectors such as dual spheres with optical readout, the sensitivity can be strongly improved by a back-action cancellation effect related to the specific geometry of this kind of detectors. We report the observation of such a back-action cancellation. Our experiment is based on a high-finesse Fabry-Perot cavity where the displacements of both mirrors are...
Summary form only given. Most works on Bell state generation via spontaneous parametric down-conversion (SPDC) do not consider the structure of its spectral line. However, we show that within the SPDC bandwidth, various Bell states can be produced.
The semiconductor laser with an injected signal is a conceptually simple system which nevertheless displays complex dynamics including chaos. Experimental and theoretical studies of this system have tended to focus on single mode lasers. Using an inverse problem solution, which relates the threshold gain modulation in wavenumber space to the spatially varying refractive index in a Fabry-Perot (FP)...
The transmission of frequency information via fiber optic telecommunication networks offers an attractive option for a long distance frequency comparison and future public dissemination of ultra-precise frequencies. Here, mode locked erbium-doped fiber lasers that combine the field of frequency metrology with that of optical telecommunication, enable a new and attractive opportunity for a direct frequency...
This paper reports the improved precision measurement of the refractive indices of air and CO2. The measured air index agrees with Edlen's formula to within 1.4times10-9 at 800 nm, while the CO2 result shows a bigger deviation with earlier results by Old et al. by 4.78times10-6 at 800 nm.
The frequency comb technique is a very useful method to measure the frequency of lasers accurately. The authors proposed a new method that is simpler and can be used for both high and low repetition rate frequency combs without the help of a wavemeter. The method is a two-step process. The authors first obtain a rough estimate of N by changing the repetition rate fr. a small amount such that no mode...
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