MEMORANDUM
... vibrations in the 1.6 micron HR. To verify that this was the case we moved to the 1.06 micron mirror set and lased quite strongly. The mirror heater was not working so we had to use a very large Rayleigh range but we still got 700 W/mA and obtained more than 800 W at 1.06 microns. We saw pressure ri ...
... vibrations in the 1.6 micron HR. To verify that this was the case we moved to the 1.06 micron mirror set and lased quite strongly. The mirror heater was not working so we had to use a very large Rayleigh range but we still got 700 W/mA and obtained more than 800 W at 1.06 microns. We saw pressure ri ...
Optically Pumped Solid-State Lasers
... 8.6 The Nd:YAG Laser YAG has a combination of desirable properties as a host medium for Nd3+ ions: it has relatively high thermal conductivity, which allows it to disperse the waste heat from the optical pumping process; it has high mechanical strength, and can be grown as crystals of large size wit ...
... 8.6 The Nd:YAG Laser YAG has a combination of desirable properties as a host medium for Nd3+ ions: it has relatively high thermal conductivity, which allows it to disperse the waste heat from the optical pumping process; it has high mechanical strength, and can be grown as crystals of large size wit ...
Imaging Spatial-Helical Mode Interference of Single Photons
... pairs and any other light coming from the laser. The latter polarizer transmitted the down-converted photons, which were vertically polarized. A non-polarizing 50-50 beam splitter separated the photon pairs half the time, with a heralding photon going directly to be detected while the other one (i. ...
... pairs and any other light coming from the laser. The latter polarizer transmitted the down-converted photons, which were vertically polarized. A non-polarizing 50-50 beam splitter separated the photon pairs half the time, with a heralding photon going directly to be detected while the other one (i. ...
basic laser safety - University of South Carolina
... Class 3R-Radiation in this class is considered low risk, but potentially hazardous. The class limit for 3R is 5x the applicable class limit for Class 1 (for invisible radiation) or class 2 (for visible radiation). Hence CW visible lasers emitting between 1 and 5 mW are normally Class 3R. Visible cla ...
... Class 3R-Radiation in this class is considered low risk, but potentially hazardous. The class limit for 3R is 5x the applicable class limit for Class 1 (for invisible radiation) or class 2 (for visible radiation). Hence CW visible lasers emitting between 1 and 5 mW are normally Class 3R. Visible cla ...
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.