STED Microscopy
... to dominate over the fluorescence process, but much longer than τ vib to allow stimulated fluorophores to relax from higher vibrational levels and thereby avoid re-excitation by the STED beam. Additionally, long τ STED also avoids unwanted multiphoton processes such as two-photon excitation, which req ...
... to dominate over the fluorescence process, but much longer than τ vib to allow stimulated fluorophores to relax from higher vibrational levels and thereby avoid re-excitation by the STED beam. Additionally, long τ STED also avoids unwanted multiphoton processes such as two-photon excitation, which req ...
Manipulating Bose-Einstein condensates with laser light Shin Inouye
... The quantum nature of matter shows up when the number of particles becomes comparable to the number of accessible states in the system. Fermions start to show the effect of the Pauli-exclusion principle when the occupation numbers become on the order of unity. Lasers start lasing when the average num ...
... The quantum nature of matter shows up when the number of particles becomes comparable to the number of accessible states in the system. Fermions start to show the effect of the Pauli-exclusion principle when the occupation numbers become on the order of unity. Lasers start lasing when the average num ...
Multiterawatt few-cycle pulse OPCPA
... The highest peak power laser amplifier systems are based almost entirely on CPA (with Nd:glass and/or Ti:sapphire gain medium), which is by now the most well-known and most reliable amplification technique. Unfortunately, the limits of scalability are reached due to self-action issues and due to the a ...
... The highest peak power laser amplifier systems are based almost entirely on CPA (with Nd:glass and/or Ti:sapphire gain medium), which is by now the most well-known and most reliable amplification technique. Unfortunately, the limits of scalability are reached due to self-action issues and due to the a ...
PHOTON STATISTICS IN SCINTILLATION CRYSTALS
... 3.7 Energy spectrum of SrI2 :Eu. The plot is made by summing the outputs of both the PMTs. The narrow photopeak indicates good energy resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8 Scatter plot for SrI2 :Eu. The negative correlation between the two PMTs can be seen i ...
... 3.7 Energy spectrum of SrI2 :Eu. The plot is made by summing the outputs of both the PMTs. The narrow photopeak indicates good energy resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8 Scatter plot for SrI2 :Eu. The negative correlation between the two PMTs can be seen i ...
“Superluminal” Pulse Propagation Dynamics by George M. Gehring
... experience, and a test of one’s resolve and limitations. However, it would be a pursuit doomed to failure without a great deal of assistance; an individual achievement made possible only through the contributions of many. I gratefully acknowledge the help of those individuals who have contributed to ...
... experience, and a test of one’s resolve and limitations. However, it would be a pursuit doomed to failure without a great deal of assistance; an individual achievement made possible only through the contributions of many. I gratefully acknowledge the help of those individuals who have contributed to ...
Thomson scattering
... used optics. Laser beam diameters should be kept large enough such that for 15-ns pulses the energy density is below the damage threshold of ~5-10 J/cm2. Transmitting surfaces need to be coated and tilted with respect to the beam propagation to Prevent losses and back-reflected light entering the la ...
... used optics. Laser beam diameters should be kept large enough such that for 15-ns pulses the energy density is below the damage threshold of ~5-10 J/cm2. Transmitting surfaces need to be coated and tilted with respect to the beam propagation to Prevent losses and back-reflected light entering the la ...
Wavelength Conversion Using Reconfigurable Photonic
... Nanophotonics (optics in nanoscale) is another domain which is a direct beneficiary of nanotechnology. Being able to manipulate light at the chip level can lead to very revolutionary results and applications. Consequently, one can find very interesting nanophotonics research topics in the literature ...
... Nanophotonics (optics in nanoscale) is another domain which is a direct beneficiary of nanotechnology. Being able to manipulate light at the chip level can lead to very revolutionary results and applications. Consequently, one can find very interesting nanophotonics research topics in the literature ...
Ans: Optical Fiber Communication System
... amplitude, frequency and phases must remain stable and free from fluctuation in order to have efficient transmission. The light beam from the source is carried by a fiber optic cable to the destination circuitry wherein the information is transmitted back to the electrical signal by a receiver circu ...
... amplitude, frequency and phases must remain stable and free from fluctuation in order to have efficient transmission. The light beam from the source is carried by a fiber optic cable to the destination circuitry wherein the information is transmitted back to the electrical signal by a receiver circu ...
Holographic Optical Beam-Steering (HOBS)
... In an ideal system, all of the signal sent into the holographic diffraction grating would be diffracted at the desired angle. In reality, some of the signal passes through the grating without being diffracted and some energy is diffracted at other angles. This error can be caused by imperfections in ...
... In an ideal system, all of the signal sent into the holographic diffraction grating would be diffracted at the desired angle. In reality, some of the signal passes through the grating without being diffracted and some energy is diffracted at other angles. This error can be caused by imperfections in ...
Nonlinear Beam Shaping with Plasmonic Metasurfaces
... plasmonic metasurfaces were shown to introduce new ways to enable and enhance the quadratic nonlinearity. The enhanced quadratic nonlinearities occur due to the combination of a microscopic symmetry break at the surfaces of the metallic inclusions, coupling of generated plasmonic currents to bright ...
... plasmonic metasurfaces were shown to introduce new ways to enable and enhance the quadratic nonlinearity. The enhanced quadratic nonlinearities occur due to the combination of a microscopic symmetry break at the surfaces of the metallic inclusions, coupling of generated plasmonic currents to bright ...
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.