Introduction to THz Wave Photonics
... THz band remain unexplored compared to the relatively well-developed science and technology in the microwave and optical frequencies. Historically, THz technologies were used mainly within the astronomy community for studying the background of cosmic far-infrared radiation, and by the laser-fusion c ...
... THz band remain unexplored compared to the relatively well-developed science and technology in the microwave and optical frequencies. Historically, THz technologies were used mainly within the astronomy community for studying the background of cosmic far-infrared radiation, and by the laser-fusion c ...
Thursday, May 10, 2007
... Bragg Gratings as Phase Matching Elements to Extend Continuum Generation at Short Wavelengths, Paul Westbrook, Jeffrey Nicholson, Kenneth Feder; OFS Labs, USA. We show that a Bragg grating can act as a phase matching element allowing a continuum pulse to generate light in narrow bandwidth beyond the ...
... Bragg Gratings as Phase Matching Elements to Extend Continuum Generation at Short Wavelengths, Paul Westbrook, Jeffrey Nicholson, Kenneth Feder; OFS Labs, USA. We show that a Bragg grating can act as a phase matching element allowing a continuum pulse to generate light in narrow bandwidth beyond the ...
(DPSS) Lasers - Society of Education
... lead to an increase in absorption losses within laser diode. Such defects are common in AlGaAs laser diodes because of the oxidation and migration of the aluminum. At present efficient aluminum free laser diodes replace the aluminum containing lasers. (iii) resistive losses and heating because of in ...
... lead to an increase in absorption losses within laser diode. Such defects are common in AlGaAs laser diodes because of the oxidation and migration of the aluminum. At present efficient aluminum free laser diodes replace the aluminum containing lasers. (iii) resistive losses and heating because of in ...
![[PDF]](http://s1.studyres.com/store/data/008779549_1-6e7b8ac54927e7e70496c037b126774b-300x300.png)
[PDF]
... been more than 200m and the power frequency grounding resistance is less than 2Ω, but the accident of lighting flashover to cause the tripping operation is still happened [10]. Exceeding the electrode is not equivalent to reducing the impulse grounding resistance. There are also many applications of ...
... been more than 200m and the power frequency grounding resistance is less than 2Ω, but the accident of lighting flashover to cause the tripping operation is still happened [10]. Exceeding the electrode is not equivalent to reducing the impulse grounding resistance. There are also many applications of ...
The effect of gamma radiation on fibre Bragg
... French physicist Paul Villard is credited with discovering gamma rays in 1900. Gamma rays are a form of electromagnetic radiation. He recognized they were different than x-rays in that they had a much larger penetrating depth also they were not affected by electrical or magnetic fields. The major di ...
... French physicist Paul Villard is credited with discovering gamma rays in 1900. Gamma rays are a form of electromagnetic radiation. He recognized they were different than x-rays in that they had a much larger penetrating depth also they were not affected by electrical or magnetic fields. The major di ...
Surface Plasmon Engineering in Graphene Functionalized with
... explore this possibility created by functionalizing graphene with organic molecules. We employ a multiscale theoretical approach that combines firstprinciples electronic structure calculations and finite-difference time-domain simulations coupled by surface conductivity. We show that by patterning two ...
... explore this possibility created by functionalizing graphene with organic molecules. We employ a multiscale theoretical approach that combines firstprinciples electronic structure calculations and finite-difference time-domain simulations coupled by surface conductivity. We show that by patterning two ...
A very convenient setup to generate intense VUV coherent light at
... for efficient VUV generation at 125.140 nm has been an open question. (ii) On the contrary, sum generation at 125.053 nm corresponds to a region of negative dispersion. It may provide a straightforward example to check, experimentally and theoretically various parameters of F W SF M processes which ca ...
... for efficient VUV generation at 125.140 nm has been an open question. (ii) On the contrary, sum generation at 125.053 nm corresponds to a region of negative dispersion. It may provide a straightforward example to check, experimentally and theoretically various parameters of F W SF M processes which ca ...
Metamaterial Electromagnetic Wave Absorbers
... An absorber, based on a metamaterial high impedance surface, was postulated and consisted of an array of SRRs spaced a distance above a ground plane and separated by a dielectric.[43] An incident wave would therefore have a reflectivity of 1 and produce large electric fields at the surface of the me ...
... An absorber, based on a metamaterial high impedance surface, was postulated and consisted of an array of SRRs spaced a distance above a ground plane and separated by a dielectric.[43] An incident wave would therefore have a reflectivity of 1 and produce large electric fields at the surface of the me ...
Amateur Extra Licensing Class
... thermal conductor for some types of electronic devices, is extremely toxic if broken or crushed and the particles are accidentally inhaled. The principle that the “Method of Moments” analysis is based on is a wire that is modeled as a series of segments, each having a distinct value of current. Ante ...
... thermal conductor for some types of electronic devices, is extremely toxic if broken or crushed and the particles are accidentally inhaled. The principle that the “Method of Moments” analysis is based on is a wire that is modeled as a series of segments, each having a distinct value of current. Ante ...
TDLS98AbBook
... This talk will review recent results from research conducted at the University of Oklahoma on the development of new IV-VI semiconductor (lead salt) epitaxial growth and laser fabrication procedures that can ultimately lead to dramatic increases in mid-IR laser operating temperatures. Work has focus ...
... This talk will review recent results from research conducted at the University of Oklahoma on the development of new IV-VI semiconductor (lead salt) epitaxial growth and laser fabrication procedures that can ultimately lead to dramatic increases in mid-IR laser operating temperatures. Work has focus ...
Clutter elimination for deep clinical optoacoustic imaging using
... imaging plane, but are exposed to the irradiating laser light (Fig. 2a). The resulting strong OA transients, even though detected by the probe at an angle where elevational sensitivity is low, can obscure the weak OA signals from structures deep inside the tissue. Echo clutter (Fig. 2b) may be gener ...
... imaging plane, but are exposed to the irradiating laser light (Fig. 2a). The resulting strong OA transients, even though detected by the probe at an angle where elevational sensitivity is low, can obscure the weak OA signals from structures deep inside the tissue. Echo clutter (Fig. 2b) may be gener ...
Radiation Noise Reduction Effect using Capacitor with
... Since the radiation noise from the electronic equipment is regulated in many countries, the effective techniques of radiated noise reduction is needed in the design and manufacturing fields of the equipment. It is well known that the radiated emission from the electronic equipment is often dominated ...
... Since the radiation noise from the electronic equipment is regulated in many countries, the effective techniques of radiated noise reduction is needed in the design and manufacturing fields of the equipment. It is well known that the radiated emission from the electronic equipment is often dominated ...
Organic Broadband Terahertz Sources and Sensors
... ranges of electromagnetic radiation, it is still quite a recent technology and not fully established. A schematic of the optical arrangement of a THz system is shown in Figure 1. An output laser beam from a femtosecond laser is split into two beams, with most power going to the pump beam to drive a ...
... ranges of electromagnetic radiation, it is still quite a recent technology and not fully established. A schematic of the optical arrangement of a THz system is shown in Figure 1. An output laser beam from a femtosecond laser is split into two beams, with most power going to the pump beam to drive a ...
Coherent population trapping resonances at lower atomic
... caesium vapour. The experimental investigations have been performed by the example of nonclosed three level L-systems formed by spectral components of the D2 line of caesium atoms. The applied method allows one to analyse features of the CPT phenomenon directly at a given low long-lived level of the ...
... caesium vapour. The experimental investigations have been performed by the example of nonclosed three level L-systems formed by spectral components of the D2 line of caesium atoms. The applied method allows one to analyse features of the CPT phenomenon directly at a given low long-lived level of the ...
workshop on laser-matter interaction 2010
... selected for oral sessions and 16 for the poster session. The sessions have been organized into three 30 minutes tutorials, forty one 20 minutes talks and sixteen posters. We tried to mostly follow the participants’ wishes, but we were also concerned with keeping a certain coherence between all the ...
... selected for oral sessions and 16 for the poster session. The sessions have been organized into three 30 minutes tutorials, forty one 20 minutes talks and sixteen posters. We tried to mostly follow the participants’ wishes, but we were also concerned with keeping a certain coherence between all the ...
Determination of the water vapor continuum absorption by THz
... The techniques of FTIR and THz-TDS have been compared in previous work [3]. Although both of them have similar frequency resolution and comparable spectral S/N ratio. However, the gated and coherent detection of THz-TDS [18,19] can avoid the continuous thermal noise background, thereby giving a much ...
... The techniques of FTIR and THz-TDS have been compared in previous work [3]. Although both of them have similar frequency resolution and comparable spectral S/N ratio. However, the gated and coherent detection of THz-TDS [18,19] can avoid the continuous thermal noise background, thereby giving a much ...
Laser and nonlinear optics
... this can also be achieved in the resonator if for example the laser is over-pumped beyond the oscillation threshold. This is advantageous because there are minimum diffraction losses for TEM00 . However, non-optimal adjustment can lead to higher TEMmn -modes (m, n ∈ IN) in the resonator with spatial ...
... this can also be achieved in the resonator if for example the laser is over-pumped beyond the oscillation threshold. This is advantageous because there are minimum diffraction losses for TEM00 . However, non-optimal adjustment can lead to higher TEMmn -modes (m, n ∈ IN) in the resonator with spatial ...
Interaction of electromagnetic radiation with matter
... this quantity for various gases at optical (l0 589 nm) and radio (typically 1 MHz) frequencies. 3.1.2.2 Solids and liquids that are electrical insulators Simple non-polar materials are characterised by a constant (possibly complex) value of "r . Simple polar materials can be described by the Debye ...
... this quantity for various gases at optical (l0 589 nm) and radio (typically 1 MHz) frequencies. 3.1.2.2 Solids and liquids that are electrical insulators Simple non-polar materials are characterised by a constant (possibly complex) value of "r . Simple polar materials can be described by the Debye ...
Channeling of neutral particles in micro
... Many problems (such as the bending of a ray of polychromatic radiation through large angles and the increase in the radiation flux impinging on a target, to name some) require that we have control of the beams of radiation within a broad frequency range. Obviously, this problem can be solved quite e ...
... Many problems (such as the bending of a ray of polychromatic radiation through large angles and the increase in the radiation flux impinging on a target, to name some) require that we have control of the beams of radiation within a broad frequency range. Obviously, this problem can be solved quite e ...
Pulsed Quasi-monochromatic x-ray source for radiography
... Quasi-monochromatic x-ray backlighter can also be used in absorption spectroscopy. In the absorption spectroscopy, warm plasma is irradiated from behind, typically by broad band photon flux. The warm plasma absorbs radiation from the backlight at frequencies corresponding to the particular transitio ...
... Quasi-monochromatic x-ray backlighter can also be used in absorption spectroscopy. In the absorption spectroscopy, warm plasma is irradiated from behind, typically by broad band photon flux. The warm plasma absorbs radiation from the backlight at frequencies corresponding to the particular transitio ...
Theory of spoof plasmons in real metals
... the concentration of THz radiation [7]. However, this assumption was based on the perfect conductor description, which did not take losses into account. Here we consider the possibility of focusing using the non-perfect metal with periodically drilled grooves and show that the concentration is limit ...
... the concentration of THz radiation [7]. However, this assumption was based on the perfect conductor description, which did not take losses into account. Here we consider the possibility of focusing using the non-perfect metal with periodically drilled grooves and show that the concentration is limit ...
A review of metasurfaces: physics and applications
... index are of less interest in metasurfaces. In contrast, of significant importance are the surface or interface reflection and transmission resulting from the tailored surface impedance, including their amplitude, phase, and polarization states. The ultrathin thickness in the wave propagation direct ...
... index are of less interest in metasurfaces. In contrast, of significant importance are the surface or interface reflection and transmission resulting from the tailored surface impedance, including their amplitude, phase, and polarization states. The ultrathin thickness in the wave propagation direct ...
Experimental realization of three-dimensional indefinite cavities at the nanoscale with
... wave vector. As illustrated in Fig. 2a, for a smaller cavity, the resonating wave vector is further from the IFC of air, so radiation coupling between the cavity mode and the incident plane wave is weaker due to the increased momentum mismatch. The hyperbolic dispersion of an indefinite medium suppor ...
... wave vector. As illustrated in Fig. 2a, for a smaller cavity, the resonating wave vector is further from the IFC of air, so radiation coupling between the cavity mode and the incident plane wave is weaker due to the increased momentum mismatch. The hyperbolic dispersion of an indefinite medium suppor ...
Antenna Theory and Design
... antenna as a function of space coordinates. In most cases, the radiation pattern is determined in the far field region and is represented as a function of the directional coordinates. Radiation properties include power flux density, radiation intensity, field strength, directivity, phase or polariza ...
... antenna as a function of space coordinates. In most cases, the radiation pattern is determined in the far field region and is represented as a function of the directional coordinates. Radiation properties include power flux density, radiation intensity, field strength, directivity, phase or polariza ...
Pulsed Solid State Laser with Passive Q
... semiconductor lasers and optical fiber lasers. However, since these lasers employ very specialized technologies and design principles, they are usually treated separately from conventional solid-state lasers [1]. ...
... semiconductor lasers and optical fiber lasers. However, since these lasers employ very specialized technologies and design principles, they are usually treated separately from conventional solid-state lasers [1]. ...
Terahertz radiation
In physics, terahertz radiation – also known as submillimeter radiation, terahertz waves, tremendously high frequency, T-rays, T-waves, T-light, T-lux or THz – consists of electromagnetic waves within the ITU-designated band of frequencies from 0.3 to 3 terahertz (THz; 1 THz = 1012 Hz). Wavelengths of radiation in the terahertz band correspondingly range from 1 mm to 0.1 mm (or 100 μm). Because terahertz radiation begins at a wavelength of one millimeter and proceeds into shorter wavelengths, it is sometimes known as the submillimeter band, and its radiation as submillimeter waves, especially in astronomy.Terahertz radiation occupies a middle ground between microwaves and infrared light waves known as the terahertz gap, where technology for its generation and manipulation is in its infancy. It represents the region in the electromagnetic spectrum where the frequency of electromagnetic radiation becomes too high to be measured digitally via electronic counters, so must be measured by proxy using the properties of wavelength and energy. Similarly, the generation and modulation of coherent electromagnetic signals in this frequency range ceases to be possible by the conventional electronic devices used to generate radio waves and microwaves, requiring the development of new devices and techniques.