Large-area picosecond laser-induced periodic surface
... default). The used EKSPLA Atlantic picosecond DPSS laser provides a Gaussian laser beam (~ 60 µm focused diameter) with a wavelength of 1064 nm and a pulse length of 13 ps. The pulse frequency can be set up to 1 MHz using a power of up to 60 W. The laser fluence can be changed by adjusting an attenu ...
... default). The used EKSPLA Atlantic picosecond DPSS laser provides a Gaussian laser beam (~ 60 µm focused diameter) with a wavelength of 1064 nm and a pulse length of 13 ps. The pulse frequency can be set up to 1 MHz using a power of up to 60 W. The laser fluence can be changed by adjusting an attenu ...
Spatial resolution in atom probe tomography
... The spatial resolution in atom probe tomography is highly anisotropic: the resolution in the direction of the analysis, the dimension that is built through the procedure described above, is often high enough to resolve atomic planes in the depth of the material (Warren, et al., 1998), as revealed in ...
... The spatial resolution in atom probe tomography is highly anisotropic: the resolution in the direction of the analysis, the dimension that is built through the procedure described above, is often high enough to resolve atomic planes in the depth of the material (Warren, et al., 1998), as revealed in ...
Coherence properties of light propagated through a
... for fully characterising partially coherent optical fields and their application to problems in imaging. Traditionally, measurements of the spatial coherence of a source have been obtained using double-slit experiments4 or uniformly redundant arrays.5 These techniques, however, provide only limited ...
... for fully characterising partially coherent optical fields and their application to problems in imaging. Traditionally, measurements of the spatial coherence of a source have been obtained using double-slit experiments4 or uniformly redundant arrays.5 These techniques, however, provide only limited ...
Self-Organization of Atomic Samples in Resonators and Collective Light Forces.
... detuning, the experimentally critical parameter is not the force magnitude, that can be very large due to the stimulated nature of the emission process, but the necessary intensity to reach threshold at the given particle polarizability, sample density and temperature, and light detuning. To identif ...
... detuning, the experimentally critical parameter is not the force magnitude, that can be very large due to the stimulated nature of the emission process, but the necessary intensity to reach threshold at the given particle polarizability, sample density and temperature, and light detuning. To identif ...
Single Longitudinal Mode Blue-Violet Laser Diode for Data Storage
... coherent interference, such as holographic e.g., will benefit from having a compact blue-violet laser diode source with a long coherence length and some level of wavelength tuning. Prior approaches, such as external cavities with diffraction gratings [1], have been used to generate single longitudin ...
... coherent interference, such as holographic e.g., will benefit from having a compact blue-violet laser diode source with a long coherence length and some level of wavelength tuning. Prior approaches, such as external cavities with diffraction gratings [1], have been used to generate single longitudin ...
Supplement
... in frequency from the |2⟩ state used for imaging by ≈ 2 GHz and contribute negligibly to resonant imaging. Second, if the average probe intensity is too high, the atoms subjected to higher intensities will have a lower effective cross-section, and so any spatial fluctuations in the beam intensity will ...
... in frequency from the |2⟩ state used for imaging by ≈ 2 GHz and contribute negligibly to resonant imaging. Second, if the average probe intensity is too high, the atoms subjected to higher intensities will have a lower effective cross-section, and so any spatial fluctuations in the beam intensity will ...
Identification of ferroelectric domain structure sensitive phonon
... is given, we are further able to distinguish LO and TO modes. Here, TO modes can be observed for all symmetry species, while LO modes can only be detected for A1 symmetry. Spectra have been recorded in a wavenumber range from 120 cm 1 to 1200 cm 1. The lower limit is given by the transmission bandwi ...
... is given, we are further able to distinguish LO and TO modes. Here, TO modes can be observed for all symmetry species, while LO modes can only be detected for A1 symmetry. Spectra have been recorded in a wavenumber range from 120 cm 1 to 1200 cm 1. The lower limit is given by the transmission bandwi ...
Laser Tweezers
... paper published by Ashkin's group in 1986, reporting the achievement of "the first experimental observation... of a single-beam gradient force radiation pressure particle trap." This serendipitous development would lead to an entirely new technique for manipulating microscopic and sub-microscopic pa ...
... paper published by Ashkin's group in 1986, reporting the achievement of "the first experimental observation... of a single-beam gradient force radiation pressure particle trap." This serendipitous development would lead to an entirely new technique for manipulating microscopic and sub-microscopic pa ...
LASER - NDLR Dspace
... Comparatively low energy is needed to vaporize plastics, compared with metals. Radiation of the wavelength of the CO2 laser (10.6 m) is readily absorbed by most non-metals, which also usually have low thermal conductivity. Thus, plastic materials can be readily melted by low power (several watts) C ...
... Comparatively low energy is needed to vaporize plastics, compared with metals. Radiation of the wavelength of the CO2 laser (10.6 m) is readily absorbed by most non-metals, which also usually have low thermal conductivity. Thus, plastic materials can be readily melted by low power (several watts) C ...
Optical Coherence Tomography as a diagnostic tool
... activities in tissue models with the potential to extend imaging of scaffolds to in vivo applications, such as following grafting of engineered tissues into a host tissue [11]. Of particular importance to us is the use of OCT in dermatology, where OCT has been used to visualize the different layers ...
... activities in tissue models with the potential to extend imaging of scaffolds to in vivo applications, such as following grafting of engineered tissues into a host tissue [11]. Of particular importance to us is the use of OCT in dermatology, where OCT has been used to visualize the different layers ...
Non-linear Optical Microscopy and Spectroscopy for
... on application. The resolution of an image is dependent on the entire setup, from the wavelength of the excitation light, to each individual optical compound in the beam path, such as lenses, mirrors, filters, and the objective. The magnification and resolution are limited by aberrations and diffractio ...
... on application. The resolution of an image is dependent on the entire setup, from the wavelength of the excitation light, to each individual optical compound in the beam path, such as lenses, mirrors, filters, and the objective. The magnification and resolution are limited by aberrations and diffractio ...
Soleil-Babinet Compensator
... The variable retardance is achieved by adjusting the position of a long birefringent wedge with respect to a short fixed birefringent wedge. The wedge angle and fast axis orientation is the same for both wedges so that the retardance is uniform across the entire clear aperture of the Soleil-Babinet ...
... The variable retardance is achieved by adjusting the position of a long birefringent wedge with respect to a short fixed birefringent wedge. The wedge angle and fast axis orientation is the same for both wedges so that the retardance is uniform across the entire clear aperture of the Soleil-Babinet ...
Diffraction
... approximation near the center of the beam. We will use this source to perform Fourier Optics experiments next week. ...
... approximation near the center of the beam. We will use this source to perform Fourier Optics experiments next week. ...
Tech Notes Wavelength 2012 | www.ll.mit.edu
... diode-pumped lasers (fiber, solid state) • Graceful degradation when some individual diodes age—no singlepoint of failure • Ability to withstand unplanned (but typical) optical feedback—will not fail if optical feedback occurs from the metal sample being cut • Relative lower cost • Compact size • Wa ...
... diode-pumped lasers (fiber, solid state) • Graceful degradation when some individual diodes age—no singlepoint of failure • Ability to withstand unplanned (but typical) optical feedback—will not fail if optical feedback occurs from the metal sample being cut • Relative lower cost • Compact size • Wa ...
114, 125301 (2015)
... the sign of Ω by shifting the beams’ relative phase by π [11]. Each Raman beam (labeled A and B, respectively) was ramped from zero to its final intensity in 100 ms following a linear envelope; however, the intensity of Raman laser B was additionally modulated sinusoidally [Fig. 1(b)]. The atoms wer ...
... the sign of Ω by shifting the beams’ relative phase by π [11]. Each Raman beam (labeled A and B, respectively) was ramped from zero to its final intensity in 100 ms following a linear envelope; however, the intensity of Raman laser B was additionally modulated sinusoidally [Fig. 1(b)]. The atoms wer ...
Surface-Enhanced Raman Scattering in Noble
... strong single-molecule SERS in silver nanoparticle aggre- corresponding reduction of the SP field amplitude. This gates [2,3], and from numerous nanoparticle-based appli- effect can be treated semiclassically by incorporating the cations such as, e.g., biosensors [4] that rely on sensitiv- quantum-s ...
... strong single-molecule SERS in silver nanoparticle aggre- corresponding reduction of the SP field amplitude. This gates [2,3], and from numerous nanoparticle-based appli- effect can be treated semiclassically by incorporating the cations such as, e.g., biosensors [4] that rely on sensitiv- quantum-s ...
Induced nanoscale deformations in polymers using atomic
... the threshold differs for polymer materials, but for PMMA and PS it is around 25 MPa. This result indicates that the stress occurs even without electric breakdown, and nanostructures are formed by overcoming the plasticity of the material. The width of the nanostructures must follow the distribution ...
... the threshold differs for polymer materials, but for PMMA and PS it is around 25 MPa. This result indicates that the stress occurs even without electric breakdown, and nanostructures are formed by overcoming the plasticity of the material. The width of the nanostructures must follow the distribution ...
Document
... 1.7 o K) for the signal detection. The sample chamber of the spectrometer was placed under vacuum to eliminate any influence of water-absorption lines. The measurements with polarized light were performed using wire polarizer with wire diameter 25 µm and spacing between wires 75 µm. We extended ...
... 1.7 o K) for the signal detection. The sample chamber of the spectrometer was placed under vacuum to eliminate any influence of water-absorption lines. The measurements with polarized light were performed using wire polarizer with wire diameter 25 µm and spacing between wires 75 µm. We extended ...
Optics Ic
... on to experiments to make a series of quantitative comparisons of different lens types. They focus on analysis of imaging directly, rather than more indirect tests of lens quality. In addition, the experiments develop the design and use of the microscope for high resolution imaging. We will see how ...
... on to experiments to make a series of quantitative comparisons of different lens types. They focus on analysis of imaging directly, rather than more indirect tests of lens quality. In addition, the experiments develop the design and use of the microscope for high resolution imaging. We will see how ...
IMAGING WITH THZ PULSES TX 7725
... pulses are separated in time by a few picoseconds. Figure 3(b) shows the waveform when the two pulses are overlapped in time, producing a near cancellation of the measured signal. This cancellation relies sensitively on the delay and distortions acquired by the signal pulse when it interacts with th ...
... pulses are separated in time by a few picoseconds. Figure 3(b) shows the waveform when the two pulses are overlapped in time, producing a near cancellation of the measured signal. This cancellation relies sensitively on the delay and distortions acquired by the signal pulse when it interacts with th ...
Coherent Light Transport in a Cold Strontium Cloud
... create a 100 G cm21 magnetic field gradient to trap the atoms. A small population loss to metastable states is repumped to the ground state using two additional red lasers. The best achieved optical thickness of our Sr MOT is b 艐 3. It is deduced from transmission measurements of a resonant probe th ...
... create a 100 G cm21 magnetic field gradient to trap the atoms. A small population loss to metastable states is repumped to the ground state using two additional red lasers. The best achieved optical thickness of our Sr MOT is b 艐 3. It is deduced from transmission measurements of a resonant probe th ...
Nanowire Y-junction formation during self-faceting
... Inversely, it could be also possible to get some valuable information on the way that a 1D electronic gas splits into two 1D electronic gases. Such experiments could be used to inquire about fundamental 1D phenomena.19–22 The Y-junctions/ nanowire arrays could be also important for nanoelectronics i ...
... Inversely, it could be also possible to get some valuable information on the way that a 1D electronic gas splits into two 1D electronic gases. Such experiments could be used to inquire about fundamental 1D phenomena.19–22 The Y-junctions/ nanowire arrays could be also important for nanoelectronics i ...
Get
... geometrically scaled to ~120nm in the sample), DMD patterns that corresponding to submicron features could be made. As shown in Fig. 2, via 10 pulses, we were able to fabricate complex structures with <1μm features. As the experimental system was not a perfect imaging system (i.e. not all of the hig ...
... geometrically scaled to ~120nm in the sample), DMD patterns that corresponding to submicron features could be made. As shown in Fig. 2, via 10 pulses, we were able to fabricate complex structures with <1μm features. As the experimental system was not a perfect imaging system (i.e. not all of the hig ...
LASER PHYSICS
... In a three-level system, a resonant laser field can experience absorption reduction when a second resonant “coupling” field is applied, due to destructive quantum interference between two absorption pathways. Manifestations of this effect include coherent population trapping1,2 (CPT) and in an optic ...
... In a three-level system, a resonant laser field can experience absorption reduction when a second resonant “coupling” field is applied, due to destructive quantum interference between two absorption pathways. Manifestations of this effect include coherent population trapping1,2 (CPT) and in an optic ...
Directional Reflection measurements on
... calibrate front- and second-surface reference mirrors based on reflecting metallic layers while our directional IV accessories are specially designed for the characterisation of multilayer dielectric materials like laser mirrors. In this paper the features of these tools are discussed and an evaluat ...
... calibrate front- and second-surface reference mirrors based on reflecting metallic layers while our directional IV accessories are specially designed for the characterisation of multilayer dielectric materials like laser mirrors. In this paper the features of these tools are discussed and an evaluat ...