Phonon Laser Action in a Tunable Two-Level System
... will produce damping of the mechanical mode and optomechanical cooling through absorption of mechanical quanta. Despite power limitations imposed by the thermal nonlinearity, evidence of cooling was observed as a decrease in the absolute power level of mechanical spectral peaks with increasing optic ...
... will produce damping of the mechanical mode and optomechanical cooling through absorption of mechanical quanta. Despite power limitations imposed by the thermal nonlinearity, evidence of cooling was observed as a decrease in the absolute power level of mechanical spectral peaks with increasing optic ...
Photonic crystal cavities in silicon dioxide
... volume for different design parameters are also considered. © 2010 American Institute of Physics. 关doi:10.1063/1.3297877兴 Silicon complementary metal-oxide-semiconductor compatible materials can be integrated with electronics, and thus can have a large impact in computation, communication, and senso ...
... volume for different design parameters are also considered. © 2010 American Institute of Physics. 关doi:10.1063/1.3297877兴 Silicon complementary metal-oxide-semiconductor compatible materials can be integrated with electronics, and thus can have a large impact in computation, communication, and senso ...
On the path to Bose-Einstein condensate
... the ground state atoms emit another photon of same wavelength and changing it’s velocity for vr2 , but this time in a random direction. Considering a large number of emissions the average emitting recoil velocity < vr2 >= 0. However the first kick always has the same direction, since all the photons ...
... the ground state atoms emit another photon of same wavelength and changing it’s velocity for vr2 , but this time in a random direction. Considering a large number of emissions the average emitting recoil velocity < vr2 >= 0. However the first kick always has the same direction, since all the photons ...
Laser oscillation in proton implanted Nd:YAG waveguides
... µm. In fact, Nd:YAG was the first material that demonstrated the suitability of the ion implantation technique to fabricate waveguide lasers [3]. The ion implantation process produces at the end of the ion track an amorphization of the crystal, giving rise to a decrease of the refractive index in ma ...
... µm. In fact, Nd:YAG was the first material that demonstrated the suitability of the ion implantation technique to fabricate waveguide lasers [3]. The ion implantation process produces at the end of the ion track an amorphization of the crystal, giving rise to a decrease of the refractive index in ma ...
Micro Systems Design GmbH presents - LAS-CAD
... can be studied interactively. Laser power output and beam quality can be computed for cw and Q-switch operation ...
... can be studied interactively. Laser power output and beam quality can be computed for cw and Q-switch operation ...
22-Test Talk
... process of beam-size measurements along the beam path— a process that is not always intuitive. M2 determination requires mapping the beam propagation in space and taking beamwidth parameters along this path to determine the deviation from the theoretical. Some standards call for 10 or more measureme ...
... process of beam-size measurements along the beam path— a process that is not always intuitive. M2 determination requires mapping the beam propagation in space and taking beamwidth parameters along this path to determine the deviation from the theoretical. Some standards call for 10 or more measureme ...
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.