Report in in doc - Foundation for Research and Technology
... WP1: Theory and Simulation of photonic metamaterials (PMMs) 1. We developed a retrieval procedure for chiral metamaterials, to extract the effective parameters (permittivity, ε, permeability, μ, chirality, κ, and refractive indices) for structures placed on a substrate, and without substrate. 2. Man ...
... WP1: Theory and Simulation of photonic metamaterials (PMMs) 1. We developed a retrieval procedure for chiral metamaterials, to extract the effective parameters (permittivity, ε, permeability, μ, chirality, κ, and refractive indices) for structures placed on a substrate, and without substrate. 2. Man ...
The Development of Femtosecond Electron Diffraction for
... oscillations of all the Bragg peak positions. The concurrent lattice heating was measured by tracking the associated Bragg peak intensity attenuation. This acoustic phonon can be well fitted with a classical harmonic oscillator model using a driving force which includes both electronic and lattice c ...
... oscillations of all the Bragg peak positions. The concurrent lattice heating was measured by tracking the associated Bragg peak intensity attenuation. This acoustic phonon can be well fitted with a classical harmonic oscillator model using a driving force which includes both electronic and lattice c ...
The orbital angular momentum of light: Genesis and
... transverse components of the total angular momentum turn out to be zero. The existence of a nonzero longitudinal component of the total angular momentum is related to a nonvanishing longitudinal component of the electric field, arising from the gradient of the transverse amplitude modulation. This an ...
... transverse components of the total angular momentum turn out to be zero. The existence of a nonzero longitudinal component of the total angular momentum is related to a nonvanishing longitudinal component of the electric field, arising from the gradient of the transverse amplitude modulation. This an ...
Doctorat doc
... and minimum loss (1550nm) wavelengths of silica. Such fibers provide the backbone of modern optical telecommunication networks. Since the late 1970s these fibers has been manufactured routinely. It is possible to manufacture very long fibers with very low attenuation (0.2dB/km). Multicomponent glass ...
... and minimum loss (1550nm) wavelengths of silica. Such fibers provide the backbone of modern optical telecommunication networks. Since the late 1970s these fibers has been manufactured routinely. It is possible to manufacture very long fibers with very low attenuation (0.2dB/km). Multicomponent glass ...
Phase Matching and Coherence of High-Order Harmonic
... loss in the driving laser beam due to ionization or refraction, or by interference between coupled modes of the waveguide, are measured. The dynamic nature of the coherence length of high harmonic generation makes an in-situ measurement of this kind crucial for any implementation of quasi-phase matc ...
... loss in the driving laser beam due to ionization or refraction, or by interference between coupled modes of the waveguide, are measured. The dynamic nature of the coherence length of high harmonic generation makes an in-situ measurement of this kind crucial for any implementation of quasi-phase matc ...
TECHNICAL GUIDE
... is to modify the reflection and transmission properties of the components’ surfaces. Whenever light passes from one medium into a medium with different optical properties (most notably refractive index), part of the light is reflected and part of the light is transmitted. The intensity ratio of the ...
... is to modify the reflection and transmission properties of the components’ surfaces. Whenever light passes from one medium into a medium with different optical properties (most notably refractive index), part of the light is reflected and part of the light is transmitted. The intensity ratio of the ...
Multimode Pumping of Optical Parametric Oscillators
... and WO the spot size of the fundamental mode ( n = 0). The x D.L.). The same beam quality was obtained using a regular constant f o is the factor by which the peak of the fundamental flat output coupler, when a variable intracavity aperture of mode exceeds threshold; i.e., the peak factor above thre ...
... and WO the spot size of the fundamental mode ( n = 0). The x D.L.). The same beam quality was obtained using a regular constant f o is the factor by which the peak of the fundamental flat output coupler, when a variable intracavity aperture of mode exceeds threshold; i.e., the peak factor above thre ...
Photonic laser thruster
A photonic laser thruster is an amplified laser thruster that generates thrust directly from the laser photon momentum, rather than laser-heating propellant. The concept of single-bounce laser-pushed lightsails that utilize the photon momentum was first developed in the 1960s, however, its conversion of laser power to thrust is highly inefficient, thus has been considered impractical. Over 50 years, there had been numerous theoretical and experimental efforts to increase the conversion efficiency by recycling photons, bouncing them repetitively between two reflective mirrors in an empty optical cavity, without success. In December 2006, Young Bae successfully solved this problem and demonstrated the conversion efficiency enhancement by a factor of 100 and a photon thrust of 35 micronewtons by putting the laser energizing media between the two mirrors as in typical lasers, and the photonic laser thruster was born. In August 2015, the photonic laser thruster was demonstrated to increase the conversion efficiency enhancement by a factor over 1,000 and to achieve a photon thrust of 3.5 millinewtons at Y.K. Bae Corporation. In addition, Propelling, slowing and stopping of a small satellite, 1U CubeSat, in simulated zero-gravity were demonstrated. The photonic laser thruster was initially developed for use in nanometer precision spacecraft formation, for forming ultralarge space telescopes and radars. The photonic laser thruster is currently developed for high-precision and high-speed maneuver of small spacecraft, such as formation flying, orbit adjustments, drag compensation, and rendezvous and docking. The photonic laser thruster can be used for beaming thrust from a conventional heavy resource vehicle to a more expensive & lightweight mission vehicle, similar to tankers in aerial refueling.The practical usage of the photonic laser thruster for main space propulsion would require extremely high laser powers and overcoming technological challenges in achieving the laser power and fabricating the required optics. Photonic laser thrusters have a very high specific impulse, and can permit spacecraft reach much higher speeds than with conventional rockets, which are limited by the Tsiolkovsky rocket equation. If the photonic laser thruster is scalable for the use in such main space propulsion, multiple photonic laser thrusters can be used to construct a 'photonic railway' that has been proposed as a potential permanent transport infrastructure for interplanetary or interstellar commutes, allowing the transport craft themselves to carry very little fuel.