Orbital Dynamics of the Laser Interferometer Space Antenna
... (6) and sent through a λ/2 wave plate (7) and onto the SLM (8). The λ/2 wave plate has two purposes. The first purpose is to allow the user to control the orientation of the plane polarized light that is incident on the SLM, and second, to ensure that a clean plane polarized Gaussian beam reaches th ...
... (6) and sent through a λ/2 wave plate (7) and onto the SLM (8). The λ/2 wave plate has two purposes. The first purpose is to allow the user to control the orientation of the plane polarized light that is incident on the SLM, and second, to ensure that a clean plane polarized Gaussian beam reaches th ...
G070254-00 - DCC
... • High frequency (~ 10 Hz - 3 kHz) • Wide bandwidth • Taking data now • No detections, interesting upper limits ...
... • High frequency (~ 10 Hz - 3 kHz) • Wide bandwidth • Taking data now • No detections, interesting upper limits ...
Single Longitudinal Mode Blue-Violet Laser Diode for Data Storage
... longitudinal modes and have thus a sub-millimeter coherence length. Optical data storage technologies requiring coherent interference, such as holographic e.g., will benefit from having a compact blue-violet laser diode source with a long coherence length and some level of wavelength tuning. Prior a ...
... longitudinal modes and have thus a sub-millimeter coherence length. Optical data storage technologies requiring coherent interference, such as holographic e.g., will benefit from having a compact blue-violet laser diode source with a long coherence length and some level of wavelength tuning. Prior a ...
Generating Single Photons on Demand I Vladan Vuletic
... (see Figure 2), the grating will wash out and collective emission will not occur. Thus the entangled many-body state has a finite lifetime that depends on the temperature of the atoms and the chosen beam geometry. The single photon must be generated within a certain time after the source has been arm ...
... (see Figure 2), the grating will wash out and collective emission will not occur. Thus the entangled many-body state has a finite lifetime that depends on the temperature of the atoms and the chosen beam geometry. The single photon must be generated within a certain time after the source has been arm ...
Recent experimental work on Mach effect thrusters
... A Digression on Mach Effect Thrusters • A Mach Effect Thruster [MET] is a solid state device that produces thrust without the irreversible ejection of propellant. • METs are not “free energy” devices. They require a power source to operate. • Power can be supplied, for orbital spacecraft, by solar ...
... A Digression on Mach Effect Thrusters • A Mach Effect Thruster [MET] is a solid state device that produces thrust without the irreversible ejection of propellant. • METs are not “free energy” devices. They require a power source to operate. • Power can be supplied, for orbital spacecraft, by solar ...
ELECTRICAL & COMPUTER ENGINEERING SEMINAR “Ultrafast Lasers and Devices”
... semiconductor laser. Semiconductor lasers are valued for their compactness, efficiency and wavelength tunability. However, it has been difficult to generate large pulse energies and average powers from electrically-pumped semiconductor lasers. A 1550-nm monolithic passively modelocked slab-coupled o ...
... semiconductor laser. Semiconductor lasers are valued for their compactness, efficiency and wavelength tunability. However, it has been difficult to generate large pulse energies and average powers from electrically-pumped semiconductor lasers. A 1550-nm monolithic passively modelocked slab-coupled o ...
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.