Propulsion systems
... science constraints etc. affect mission design. How a spacecraft’s environment changes from ground level, near earth orbit and deep space. How these environments (radiation, thermal, dust etc.) feedback into the final mission design. ...
... science constraints etc. affect mission design. How a spacecraft’s environment changes from ground level, near earth orbit and deep space. How these environments (radiation, thermal, dust etc.) feedback into the final mission design. ...
Electro-optical photonic circuits for classical and
... and use one photon of the correlated pair as a trigger for its companion (commonly called heralded single photons generation). Being able to electro-activate a funnel waveguide allows us to generate a very effective intensity modulation in conjunction with very short response time. These properties ...
... and use one photon of the correlated pair as a trigger for its companion (commonly called heralded single photons generation). Being able to electro-activate a funnel waveguide allows us to generate a very effective intensity modulation in conjunction with very short response time. These properties ...
quant-ph/0406002 PDF
... adjusting the distance L. Parameters such as the sensitivity of photon detection and the distance L can be modified linearly. In this experiment, longitudinal rather than transverse momentum is discussed. In other words, the correlation between the detection of the photon trajectory and interference ...
... adjusting the distance L. Parameters such as the sensitivity of photon detection and the distance L can be modified linearly. In this experiment, longitudinal rather than transverse momentum is discussed. In other words, the correlation between the detection of the photon trajectory and interference ...
High Power Operation of a 17 GHz Photocathode RF Gun
... 14, an extremely narrow, about 4 ns long, negative Faraday cup signal follows the positive photodiode signal by about 6 ns. This delay is consistent with the physical location of the photodiode detector relative to the RF gun and Faraday cup. UV pulses were measured to be about 20 µ J. The integrate ...
... 14, an extremely narrow, about 4 ns long, negative Faraday cup signal follows the positive photodiode signal by about 6 ns. This delay is consistent with the physical location of the photodiode detector relative to the RF gun and Faraday cup. UV pulses were measured to be about 20 µ J. The integrate ...
Laser Collimation of a Chromium Beam Using Doppler Force Wen
... typically uses a series of cylindrical atomic lenses formed by an optical standing wave (SW) to focus or manipulate atoms and deposit an atomic beam onto a substrate [1]. The collimation of the atomic beams plays an important role in atom lithography technology for two main reasons: the structure wi ...
... typically uses a series of cylindrical atomic lenses formed by an optical standing wave (SW) to focus or manipulate atoms and deposit an atomic beam onto a substrate [1]. The collimation of the atomic beams plays an important role in atom lithography technology for two main reasons: the structure wi ...
Lecture 11: Semiconductor lasers and light
... => Pint = int i/e • (1240 eV-nm / 870 nm) = 36 mW! (However, this power level is not readily out-coupled from the device! )21 ...
... => Pint = int i/e • (1240 eV-nm / 870 nm) = 36 mW! (However, this power level is not readily out-coupled from the device! )21 ...
Proposal for a Magneto-optical Beam Splitter for Atoms.
... therefore limited by microfabrication techniques. The momentum distribution produced by coherent diffraction from a standing light wave has an envelope given by a Bessel function distribution. For this reason, standing-wave diffraction is not an efficient technique for producing a coherent splitting ...
... therefore limited by microfabrication techniques. The momentum distribution produced by coherent diffraction from a standing light wave has an envelope given by a Bessel function distribution. For this reason, standing-wave diffraction is not an efficient technique for producing a coherent splitting ...
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Precision High Numerical Aperture Scanning System for
... occurs in the focal region of the laser and is dependent on the speed the focal region is travelling through the material and power in the laser. In order to write efficiently, it is crucial to be able to reach scan speeds of up to 200 mm/s with reliable and consistent knowledge of the speed and pos ...
... occurs in the focal region of the laser and is dependent on the speed the focal region is travelling through the material and power in the laser. In order to write efficiently, it is crucial to be able to reach scan speeds of up to 200 mm/s with reliable and consistent knowledge of the speed and pos ...
De la Rue, R. et al. (2006) Photonic crystal and photonic wire nano
... Single-crystal silicon continues to play a dominant role in electronics—and the silicon chip is nearly universal in a wide range of applications. The possibilities for using single-crystal silicon in optoelectronics and photonics have also been recognized for some time. Silicon provides the basis fo ...
... Single-crystal silicon continues to play a dominant role in electronics—and the silicon chip is nearly universal in a wide range of applications. The possibilities for using single-crystal silicon in optoelectronics and photonics have also been recognized for some time. Silicon provides the basis fo ...
Beam Splitters A beam splitter is a device that`s used to divide an
... In some applications that involve multiple reflections—such as a laser cavity—even the high reflectance of the metals may not be enough. Surfaces ...
... In some applications that involve multiple reflections—such as a laser cavity—even the high reflectance of the metals may not be enough. Surfaces ...
Metal surface structuring with spatiotemporally focused femtosecond
... The results given above show that the STF scheme can help improve the quality for metal surface structuring particularly under high peak laser intensities, a condition frequently required for highthroughput surface structuring. One of the physical reasons behind this is shown in Fig. 2. One can real ...
... The results given above show that the STF scheme can help improve the quality for metal surface structuring particularly under high peak laser intensities, a condition frequently required for highthroughput surface structuring. One of the physical reasons behind this is shown in Fig. 2. One can real ...
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.