Organic Broadband Terahertz Sources and Sensors
... lasers providing shorter and shorter pulses (down to ∼12 fs, commercially available). The achievable bandwidth from most PDA-based THz systems is usually a few THz and is often attributed to the limit of the carrier lifetime of the photoconductor involved. In a few cases, however, ultrabroad bandwid ...
... lasers providing shorter and shorter pulses (down to ∼12 fs, commercially available). The achievable bandwidth from most PDA-based THz systems is usually a few THz and is often attributed to the limit of the carrier lifetime of the photoconductor involved. In a few cases, however, ultrabroad bandwid ...
Leica TCS SP8 STED 3X-Brochure EN
... system, helps to improve your data. Huygens decreases noise levels dramatically and also enhances resolution in x, y and z. After deconvolution of STED data, even smaller details are resolved in all dimensions. As you can compare the outcome directly with your raw data, you avoid being misled by ima ...
... system, helps to improve your data. Huygens decreases noise levels dramatically and also enhances resolution in x, y and z. After deconvolution of STED data, even smaller details are resolved in all dimensions. As you can compare the outcome directly with your raw data, you avoid being misled by ima ...
chapter 4 starfish - Grupo de Óptica
... This thesis is devoted to the development of a technique for the measurement of the spatiotemporal amplitude and phase of ultrashort laser pulses and its applications. The core of the thesis is divided into three parts, which correspond to the presentation of the technique (Part I), its applications ...
... This thesis is devoted to the development of a technique for the measurement of the spatiotemporal amplitude and phase of ultrashort laser pulses and its applications. The core of the thesis is divided into three parts, which correspond to the presentation of the technique (Part I), its applications ...
Nonlinear pulse compression DISSERTATION
... inside the crystal and the generation of untilted sum-frequency pulses, precompensation of the NIR pulse-front tilts is essential. I show that these pulse-front tilts can be achieved using a very compact setup based on i ...
... inside the crystal and the generation of untilted sum-frequency pulses, precompensation of the NIR pulse-front tilts is essential. I show that these pulse-front tilts can be achieved using a very compact setup based on i ...
applications of optical cavities in modern atomic, molecular
... vacuum structure and/or the large field associated with a single photon confined to a small volume. Experimental activities that have benefited from the use of optical cavities appear in such diverse areas as ultra-sensitive detection for classical laser spectroscopy, nonlinear optical devices, opti ...
... vacuum structure and/or the large field associated with a single photon confined to a small volume. Experimental activities that have benefited from the use of optical cavities appear in such diverse areas as ultra-sensitive detection for classical laser spectroscopy, nonlinear optical devices, opti ...
Mechanisms of Pulsed Laser Ablation of
... VI). Once the various steps constituting the ablation process have been analyzed, we survey the theoretical models that have been developed to describe this process as well as the use of metrics such as ablation threshold, ablation enthalpy, and ablation efficiency that are used to characterize its ...
... VI). Once the various steps constituting the ablation process have been analyzed, we survey the theoretical models that have been developed to describe this process as well as the use of metrics such as ablation threshold, ablation enthalpy, and ablation efficiency that are used to characterize its ...
Femtosecond filamentation in transparent media
... observe filaments and to measure their characteristics are described. The main measurements of filament features performed so far are reviewed. © 2007 Elsevier B.V. All rights reserved. ...
... observe filaments and to measure their characteristics are described. The main measurements of filament features performed so far are reviewed. © 2007 Elsevier B.V. All rights reserved. ...
High Harmonic Generation for Coherent Diffractive Imaging
... beam is confined to only a few intense harmonic orders. This beam can be directly used for experimental purposes without any narrow-bandwidth optics in the beam path that might affect the harmonic emission in its spatial, spectral or temporal domain. Also any loss in harmonic flux due to intrinsic i ...
... beam is confined to only a few intense harmonic orders. This beam can be directly used for experimental purposes without any narrow-bandwidth optics in the beam path that might affect the harmonic emission in its spatial, spectral or temporal domain. Also any loss in harmonic flux due to intrinsic i ...
Displacement laser interferometry with sub-nanometer
... Development in industry is asking for improved resolution and higher accuracy in mechanical measurement. Together with miniaturization the demand for sub nanometer uncertainty on dimensional metrology is increasing rapidly. Displacement laser interferometers are used widely as precision displacement ...
... Development in industry is asking for improved resolution and higher accuracy in mechanical measurement. Together with miniaturization the demand for sub nanometer uncertainty on dimensional metrology is increasing rapidly. Displacement laser interferometers are used widely as precision displacement ...
near-field radiative transfer: thermal radiation
... This dissertation focuses on near-field radiative transfer, which can be defined as the discipline concerned with energy transfer via electromagnetic waves at sub-wavelength distances. Three specific subjects related to this discipline are investigated, namely nearfield thermal radiation, nanoscale- ...
... This dissertation focuses on near-field radiative transfer, which can be defined as the discipline concerned with energy transfer via electromagnetic waves at sub-wavelength distances. Three specific subjects related to this discipline are investigated, namely nearfield thermal radiation, nanoscale- ...
Laser Sources for Confocal Microscopy
... photons absorbed = ( flux per pixel) ¥ (OD) = 2 ¥ 105 ( s * pixel * mW ) at 500 nm. Assuming a quantum yield of 0.8 and a collection efficiency of 10%, the detector receives photons at the detector = 1.6 ¥ 10 4 (s * pixel * mW of incident light). Given the quantum efficiency for a good detector (10% ...
... photons absorbed = ( flux per pixel) ¥ (OD) = 2 ¥ 105 ( s * pixel * mW ) at 500 nm. Assuming a quantum yield of 0.8 and a collection efficiency of 10%, the detector receives photons at the detector = 1.6 ¥ 10 4 (s * pixel * mW of incident light). Given the quantum efficiency for a good detector (10% ...
Raman microscopy in an electron microscope: combining chemical
... intercept a high fraction of the emitted signal. This leads to typically worse resolution than for SE imaging. Contrast arises from spatial variations in those properties that affect the intensity of the signal, so in each mode information is obtainable concerning a group of properties. These differ ...
... intercept a high fraction of the emitted signal. This leads to typically worse resolution than for SE imaging. Contrast arises from spatial variations in those properties that affect the intensity of the signal, so in each mode information is obtainable concerning a group of properties. These differ ...
Laser Sources for Confocal Microscopy
... Given the quantum efficiency for a good detector (10% at 500 nm), the final detected photon flux should be about flux detected = 1600 photons (s * pixel * mW of light). This flux should be compared with the dark noise of most detectors, which can vary between 10 and 100 equivalent photons/(s * pixel ...
... Given the quantum efficiency for a good detector (10% at 500 nm), the final detected photon flux should be about flux detected = 1600 photons (s * pixel * mW of light). This flux should be compared with the dark noise of most detectors, which can vary between 10 and 100 equivalent photons/(s * pixel ...
Development of a Tm3+-doped Fluoride Glass - DORAS
... constructed in this work has an operating wavelength of X = 2.3 n.m, which corresponds to an absorption band of many hydrocarbon gases. The thulium-doped fibre has been fully characterised in terms of absorption, fluorescence and fluorescence lifetimes. These data were then used to choose a pump las ...
... constructed in this work has an operating wavelength of X = 2.3 n.m, which corresponds to an absorption band of many hydrocarbon gases. The thulium-doped fibre has been fully characterised in terms of absorption, fluorescence and fluorescence lifetimes. These data were then used to choose a pump las ...
Thursday, May 10, 2007
... Schubert1; 1Fraunhofer Inst. for Telecommunications, Germany, 2Univ. of Paderborn, Dept. Applied Physics, Germany. We demonstrate wavelength conversion of 160Gbit/ s DPSK and 320Gbit/s DQPSK data signals by cascaded second-harmonic and difference frequency generation in a periodically poled LiNbO3 w ...
... Schubert1; 1Fraunhofer Inst. for Telecommunications, Germany, 2Univ. of Paderborn, Dept. Applied Physics, Germany. We demonstrate wavelength conversion of 160Gbit/ s DPSK and 320Gbit/s DQPSK data signals by cascaded second-harmonic and difference frequency generation in a periodically poled LiNbO3 w ...
Optical Spectroscopy of Spin Ladders
... 1D Heisenberg chains and odd-leg ladders that have gapless excitation spectra. The socalled telephone-number compounds (Sr,La,Ca)14 Cu24 O41 provide excellent realizations of two-leg spin ladders, which are composed of the same corner-sharing plaquettes as the 2D cuprates. High-quality single crysta ...
... 1D Heisenberg chains and odd-leg ladders that have gapless excitation spectra. The socalled telephone-number compounds (Sr,La,Ca)14 Cu24 O41 provide excellent realizations of two-leg spin ladders, which are composed of the same corner-sharing plaquettes as the 2D cuprates. High-quality single crysta ...
The influence of growth temperature on CVD grown graphene on SiC
... 2. PRINCIPLES OF CHARACTERIZATION METHODS This part introduces and explains the basis of the different characterization methods such as reflectance mapping, atomic force microscopy (AFM) and Raman spectroscopy. ...
... 2. PRINCIPLES OF CHARACTERIZATION METHODS This part introduces and explains the basis of the different characterization methods such as reflectance mapping, atomic force microscopy (AFM) and Raman spectroscopy. ...
reflectance measurement and modelling of high reflectivity
... This thesis is about the reflectance measurement of high reflectivity DBR stacks by using Fourier Transform Infrared (FT-IR) spectroscopy. First, the basic theory of optical multilayer is reviewed and then the principle operation of FT-IR spectroscopy is studied. Followed by method used to simulate ...
... This thesis is about the reflectance measurement of high reflectivity DBR stacks by using Fourier Transform Infrared (FT-IR) spectroscopy. First, the basic theory of optical multilayer is reviewed and then the principle operation of FT-IR spectroscopy is studied. Followed by method used to simulate ...
Role of wavefront aberrations of amplified femtosecond pulses in
... 4.2.4 Phase matching ............................................................................................................... 75 4.2.5 Spatial walk-off effect ..................................................................................................... 78 4.3. Description of second-ha ...
... 4.2.4 Phase matching ............................................................................................................... 75 4.2.5 Spatial walk-off effect ..................................................................................................... 78 4.3. Description of second-ha ...
DETERMINING SPATIAL MODES OF SEMICONDUCTOR LASERS
... spatial modes in lasers by analyzing the spatial coherence of the laser beam. Most previous methods for determining modal weights have relied on assumed shapes for the spatial modes. Using a twin-fiber interferometer we measured correlation data from each laser. The two arms of a single-mode fiber c ...
... spatial modes in lasers by analyzing the spatial coherence of the laser beam. Most previous methods for determining modal weights have relied on assumed shapes for the spatial modes. Using a twin-fiber interferometer we measured correlation data from each laser. The two arms of a single-mode fiber c ...
STED Microscopy
... first exposed to an excitation laser pulse and directly afterward by a STED laser pulse. In addition to the fluorescence lifetime, τ fl (typically ∼2 ns), vibrational relaxation lifetimes, τ vib (typically <1 ps), and nonlinear absorption occurring at high peak intensities have to be considered in this ...
... first exposed to an excitation laser pulse and directly afterward by a STED laser pulse. In addition to the fluorescence lifetime, τ fl (typically ∼2 ns), vibrational relaxation lifetimes, τ vib (typically <1 ps), and nonlinear absorption occurring at high peak intensities have to be considered in this ...
Coherent Control of Atoms and Molecules
... model of the HHG control experiment, and with his help, we were able to demonstrate that we were controlling the process with attosecond precision. Hersch Rabitz was very excited when he heard about our experimental results in the control of HHG. We spoke with him quite extensively and worked in col ...
... model of the HHG control experiment, and with his help, we were able to demonstrate that we were controlling the process with attosecond precision. Hersch Rabitz was very excited when he heard about our experimental results in the control of HHG. We spoke with him quite extensively and worked in col ...
The Strontium Optical Lattice Clock
... The Strontium Optical Lattice Clock: Optical Spectroscopy with Sub-Hertz Accuracy written by Andrew D. Ludlow has been approved for the Department of Physics ...
... The Strontium Optical Lattice Clock: Optical Spectroscopy with Sub-Hertz Accuracy written by Andrew D. Ludlow has been approved for the Department of Physics ...
Poster Session Program
... The national project of development of a 300GHz band folded waveguide traveling wave tube (FWG-TWT) for broad band communications has started last year. We will present the outline of the development program and summary design of the FWG-TWT. Major targets of the 300GHz FWG-TWT are the output power ...
... The national project of development of a 300GHz band folded waveguide traveling wave tube (FWG-TWT) for broad band communications has started last year. We will present the outline of the development program and summary design of the FWG-TWT. Major targets of the 300GHz FWG-TWT are the output power ...
AFM-IR
AFM-IR refers to atomic force microscope (AFM) based infrared (IR) spectroscopy. AFM-IR is a technique for chemical analysis of samples at nanoscale spatial resolution. AFM-IR is related to techniques including Tip-Enhanced Raman Spectroscopy (TERS) and scanning near-field optical microscopy (SNOM) and other methods of vibrational analysis with scanning probe microscopy. The AFM-IR technique uses a sharp tip of an AFM probe to measure the absorption of infrared light by a sample. Recording the amount of IR absorption as a function of wavelength or wavenumber creates nanoscale IR absorption spectra, which can be used to chemically characterize and even identify unknown materials. Recording the IR absorption as a function of position can be used to create chemical composition maps that show the spatial distribution of different chemical components. AFM-IR can overcome the diffraction limit that limits the spatial resolution of conventional infrared microscopy and microspectroscopy to the scale of several microns. AFM-IR can achieve spatial resolution down to around 20 nm, limited in some case only by the sharpness of the AFM probe tip and sensitivity down to the scale of molecular monolayers.