2001 - Institute of Applied Physics - Friedrich-Schiller
... optical properties. A disadvantage of refractive elements is, that their profile depth depends on the beam diameter and the deflection angle, which we need to achieve the desired intensity distribution. It is easy to see that the profile depth of a refractive beam shaping element increases when the ...
... optical properties. A disadvantage of refractive elements is, that their profile depth depends on the beam diameter and the deflection angle, which we need to achieve the desired intensity distribution. It is easy to see that the profile depth of a refractive beam shaping element increases when the ...
Portable Ultrafast Blue Light Sources Designed With Frequency
... by very narrow spectral acceptance bandwidths ( 1 nm), aperiodically poled structures (characterized by a linear gradient in grating period) have the advantage of providing sufficiently broad spectral acceptance bandwidths to utilize more of the spectrum associated with picosecond [22] and femtoseco ...
... by very narrow spectral acceptance bandwidths ( 1 nm), aperiodically poled structures (characterized by a linear gradient in grating period) have the advantage of providing sufficiently broad spectral acceptance bandwidths to utilize more of the spectrum associated with picosecond [22] and femtoseco ...
Reflectivity of Nonlinear Apodized Chirped Fiber Bragg Grating Under Water
... 3. W ater Depth Effect: The existence of any fiber cable under ocean depth acts to change the behavior of this cable, because of the temperature decrease and the pressure increase. One aims here to study the reflectivity of the apodized chirped Bragg grating under ocean depth. The Effect of the ocea ...
... 3. W ater Depth Effect: The existence of any fiber cable under ocean depth acts to change the behavior of this cable, because of the temperature decrease and the pressure increase. One aims here to study the reflectivity of the apodized chirped Bragg grating under ocean depth. The Effect of the ocea ...
Long-Term Voltage-Sensitive Dye Imaging Reveals Cortical
... fixated within 2 ⫻ 2° on a small spot of light (fixation point, 0.1 ⫻ 0.1°) that remained throughout the entire trial. After 4⫺6 s, a stimulus appeared on the screen. The stimulus, usually a drifting grating (contrast, 90%; size, 5⫺13° ⫻ 5⫺13°; spatial frequency, 1⫺3 cycles/°; temporal frequency, 1⫺ ...
... fixated within 2 ⫻ 2° on a small spot of light (fixation point, 0.1 ⫻ 0.1°) that remained throughout the entire trial. After 4⫺6 s, a stimulus appeared on the screen. The stimulus, usually a drifting grating (contrast, 90%; size, 5⫺13° ⫻ 5⫺13°; spatial frequency, 1⫺3 cycles/°; temporal frequency, 1⫺ ...
Full text - UvA/FNWI - University of Amsterdam
... One-dimensional (1D) gases exhibit interesting phenomena that are not present in either 2D or 3D. Atom chips oer an attractive route to creating and manipulating such 1D gases. By employing speci cally designed wire patterns, the magnetic trapping potential of our chip features a strong harmonic co ...
... One-dimensional (1D) gases exhibit interesting phenomena that are not present in either 2D or 3D. Atom chips oer an attractive route to creating and manipulating such 1D gases. By employing speci cally designed wire patterns, the magnetic trapping potential of our chip features a strong harmonic co ...
Power efficiency of a semiconductor laser with an external cavity
... The combined eect of threshold and slope variation is shown in Fig. 2 as measured on two 800-nm laser diodes (SDL 4510, Bonneville BW800-1-M); in the experiments, a 1200-lines/mm grating was used (total attenuation R3 0:04, inclusive of the output tap), and the lasers were temperature stabilized ...
... The combined eect of threshold and slope variation is shown in Fig. 2 as measured on two 800-nm laser diodes (SDL 4510, Bonneville BW800-1-M); in the experiments, a 1200-lines/mm grating was used (total attenuation R3 0:04, inclusive of the output tap), and the lasers were temperature stabilized ...
Structural and optical properties of visible active
... structures are formed at low Ptot. Inspection of the images reveals that sizes of these structures are approximately between 30 and 60 nm. At Ptot 5 4.0 Pa, the films appear to consist of structures with rounder shapes [Fig. 1(b)]. The underlying substrate is clearly seen in the cracks between the st ...
... structures are formed at low Ptot. Inspection of the images reveals that sizes of these structures are approximately between 30 and 60 nm. At Ptot 5 4.0 Pa, the films appear to consist of structures with rounder shapes [Fig. 1(b)]. The underlying substrate is clearly seen in the cracks between the st ...
Magnetic, optical, and magneto-optical properties of MnX „X As, Sb
... we have chosen, by comparing the calculated intraband contribution with experimental results, \/ t 50.2 eV for all three compounds considered. Note that the variation of this parameter within reasonable limits has very little effect on the optical conductivity for energies larger than 1 eV. The unsc ...
... we have chosen, by comparing the calculated intraband contribution with experimental results, \/ t 50.2 eV for all three compounds considered. Note that the variation of this parameter within reasonable limits has very little effect on the optical conductivity for energies larger than 1 eV. The unsc ...
Lithium Niobate Microphotonic Modulators
... pass-band filtered, amplified, and fed to a mixer. A local oscillator (LO) also feeds the mixer whose output is filtered to obtain base-band. ................. 4 Figure 2. Insertion of mm-wave microphotonic device technologies in future broadband heterodyne wireless architectures. An electromagnetic ...
... pass-band filtered, amplified, and fed to a mixer. A local oscillator (LO) also feeds the mixer whose output is filtered to obtain base-band. ................. 4 Figure 2. Insertion of mm-wave microphotonic device technologies in future broadband heterodyne wireless architectures. An electromagnetic ...
Chapter 5: Optical aberrations in the mouse eye
... between the photoreceptor plane layer and the retinal layer where the retinoscopic reflection potentially takes place. The only experimental modulation transfer functions (MTFs) available in the rodent eye (mostly rat’s and one example for one mouse) are those from Artal et al.’s study (Artal et al. ...
... between the photoreceptor plane layer and the retinal layer where the retinoscopic reflection potentially takes place. The only experimental modulation transfer functions (MTFs) available in the rodent eye (mostly rat’s and one example for one mouse) are those from Artal et al.’s study (Artal et al. ...
Wavelength Conversion Technologies for Photonic Network
... Despite such expectations and some promising experimental reports, the wavelength conversion technologies are as yet immature. The technologies that have been reported so far are the OE-EO transponder type, the gating type using semiconductor devices and optical fiber,5)-9) and the coherent type, wh ...
... Despite such expectations and some promising experimental reports, the wavelength conversion technologies are as yet immature. The technologies that have been reported so far are the OE-EO transponder type, the gating type using semiconductor devices and optical fiber,5)-9) and the coherent type, wh ...
Light scattering at small angles by atmospheric irregular particles
... (Renard et al., 2010). No lenses were used to gather the scattered light; scattered photons travel directly to the photodiode, which presents a diameter larger than the optical canal. We use a laser beam which is linearly partially polarised. As long as the detector is not polarised, it yields the t ...
... (Renard et al., 2010). No lenses were used to gather the scattered light; scattered photons travel directly to the photodiode, which presents a diameter larger than the optical canal. We use a laser beam which is linearly partially polarised. As long as the detector is not polarised, it yields the t ...
Resonant-Cavity Light-Emitting Diodes: a review
... Since the invention and first demonstration1 in 1992 of the Resonant-Cavity LED (RCLED) which uses photon quantisation in microcavities to enhance spontaneous emission properties, directionality, intensity and purity can as well denote key performance characteristics of LEDs. These assets make RCLED ...
... Since the invention and first demonstration1 in 1992 of the Resonant-Cavity LED (RCLED) which uses photon quantisation in microcavities to enhance spontaneous emission properties, directionality, intensity and purity can as well denote key performance characteristics of LEDs. These assets make RCLED ...
Laser-based displays: a review - Optical Microsystems Laboratory
... Even though the idea of using lasers for displays was proposed in the 1960s [1], it is the availability of lasers emitting red, green, and blue colors that triggered the recent development of portable laser projectors. An immediate advantage of using spectrally pure laser light for displays is the w ...
... Even though the idea of using lasers for displays was proposed in the 1960s [1], it is the availability of lasers emitting red, green, and blue colors that triggered the recent development of portable laser projectors. An immediate advantage of using spectrally pure laser light for displays is the w ...
Doppler-Free Saturated Absorption Spectroscopy of Rubidium Using a Tunable Diode Laser
... transmission, and the half-wave plate was adjusted such that one to two mW of power was going into the saturated absorption spectroscopy setup. A function generator (Simpson 420) was connected to the tunable diode laser’s PZT and used to ramp the PZT over a range of roughly 15V at a frequency of 3Hz ...
... transmission, and the half-wave plate was adjusted such that one to two mW of power was going into the saturated absorption spectroscopy setup. A function generator (Simpson 420) was connected to the tunable diode laser’s PZT and used to ramp the PZT over a range of roughly 15V at a frequency of 3Hz ...
Lecture0006c - Purdue University Cytometry Laboratories
... From a Biorad 1024 Confocal – UV laser excitation dichroic this dichroic split the 350 and 488 beams. It is clearly badly damaged. This filter was in direct contact with a high power laser. ©1990-2012 J .Paul Robinson, Purdue University BMS 631 – Lecture0006c.ppt ...
... From a Biorad 1024 Confocal – UV laser excitation dichroic this dichroic split the 350 and 488 beams. It is clearly badly damaged. This filter was in direct contact with a high power laser. ©1990-2012 J .Paul Robinson, Purdue University BMS 631 – Lecture0006c.ppt ...
Real and Imaginary Properties of Epsilon-Near
... relatively low loss [14,15] in the optical range is indeed much inferior to real metals as a waveguiding material. As we have discussed above in conjunction with Eq. (7), this is due to the weak confinement: the energy leaks into the ENZ material where it is absorbed. For a rectangular SiO2 waveguid ...
... relatively low loss [14,15] in the optical range is indeed much inferior to real metals as a waveguiding material. As we have discussed above in conjunction with Eq. (7), this is due to the weak confinement: the energy leaks into the ENZ material where it is absorbed. For a rectangular SiO2 waveguid ...
Safety Guideline for the Projectors with Laser Device as Light Source
... propagate long distance without diffusion, and is able to converge on a very small spot as well. [Characteristic features that beam go straight without diffusion.]. Temporal coherence It is the amount to indicate the degree of light wave coherency at different time points. It is expressed by the deg ...
... propagate long distance without diffusion, and is able to converge on a very small spot as well. [Characteristic features that beam go straight without diffusion.]. Temporal coherence It is the amount to indicate the degree of light wave coherency at different time points. It is expressed by the deg ...
Femtosecond powder diffraction with a laser-driven hard X
... bond length. The intensity of X-ray diffraction peaks is determined by the Fourier transform of the three-dimensional electron density. Thus, spatially resolved maps of electronic charge density can be derived from X-ray diffraction patterns. There is a variety of powerful X-ray diffraction methods ...
... bond length. The intensity of X-ray diffraction peaks is determined by the Fourier transform of the three-dimensional electron density. Thus, spatially resolved maps of electronic charge density can be derived from X-ray diffraction patterns. There is a variety of powerful X-ray diffraction methods ...
Inducing and Controlling Particle Motion in an Optical Trap
... by the Sun’s rays on the matter tail. More than a 100 years later, Leonhard Euler, who was inspired by the same effect, assigned pressing forces to a light beam and made an attempt to justify them theoretically [32]. The theoretical basis for the pressure of radiation was given by James Maxwell in 1 ...
... by the Sun’s rays on the matter tail. More than a 100 years later, Leonhard Euler, who was inspired by the same effect, assigned pressing forces to a light beam and made an attempt to justify them theoretically [32]. The theoretical basis for the pressure of radiation was given by James Maxwell in 1 ...
Imaging Proptosis
... • Discuss different radiologic studies available for imaging the orbit • Show examples of how these imaging modalities can be used distinguish between different causes of proptosis • Return to our patient ...
... • Discuss different radiologic studies available for imaging the orbit • Show examples of how these imaging modalities can be used distinguish between different causes of proptosis • Return to our patient ...
Guided photoluminescence study of Nd
... Figures 6 present guided fluorescence decays (τ) of 4F3/2 - 4I11/2 radiative transition excited at 444 nm by top surface pumping of Nd3+-doped- SRSO and SRSN planar waveguides. Due to the non-exponential decay of the luminescence, the fitting by an exponential curve cannot be easily done. The lifeti ...
... Figures 6 present guided fluorescence decays (τ) of 4F3/2 - 4I11/2 radiative transition excited at 444 nm by top surface pumping of Nd3+-doped- SRSO and SRSN planar waveguides. Due to the non-exponential decay of the luminescence, the fitting by an exponential curve cannot be easily done. The lifeti ...
Sample Chapter
... region is the light guiding region known as the core. It is surrounded by a coaxial middle region known as the cladding. The outermost region is called the sheath. The refractive index of cladding is always lower than that of the core. The purpose of cladding is to make the light to be confined to t ...
... region is the light guiding region known as the core. It is surrounded by a coaxial middle region known as the cladding. The outermost region is called the sheath. The refractive index of cladding is always lower than that of the core. The purpose of cladding is to make the light to be confined to t ...
Long-distance vision
... low-loss standard singlemode fibre. An interesting example of such a hybrid cable solution is provided by the Fibreco Telecommunications network which links together the major cities of South Africa. The network, which stretches over a total distance of 12,000km, includes a 2,000-km link between Joh ...
... low-loss standard singlemode fibre. An interesting example of such a hybrid cable solution is provided by the Fibreco Telecommunications network which links together the major cities of South Africa. The network, which stretches over a total distance of 12,000km, includes a 2,000-km link between Joh ...
Optical coherence tomography
Optical coherence tomography (OCT) is an established medical imaging technique that uses light to capture micrometer-resolution, three-dimensional images from within optical scattering media (e.g., biological tissue). Optical coherence tomography is based on low-coherence interferometry, typically employing near-infrared light. The use of relatively long wavelength light allows it to penetrate into the scattering medium. Confocal microscopy, another optical technique, typically penetrates less deeply into the sample but with higher resolution.Depending on the properties of the light source (superluminescent diodes, ultrashort pulsed lasers, and supercontinuum lasers have been employed), optical coherence tomography has achieved sub- micrometer resolution (with very wide-spectrum sources emitting over a ~100 nm wavelength range).Optical coherence tomography is one of a class of optical tomographic techniques. A relatively recent implementation of optical coherence tomography, frequency-domain optical coherence tomography, provides advantages in signal-to-noise ratio, permitting faster signal acquisition. Commercially available optical coherence tomography systems are employed in diverse applications, including art conservation and diagnostic medicine, notably in ophthalmology and optometry where it can be used to obtain detailed images from within the retina. Recently it has also begun to be used in interventional cardiology to help diagnose coronary artery disease. It has also shown promise in dermatology to improve the diagnostic process.