Cheng - The University of Akron
... Photonics, Photonic Crystal and Photonic Band Gap • Photonics: “The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon.”1 • Photonic Crystals: (photonic band gap materials), are materials with periodic variation of refractive index. A ph ...
... Photonics, Photonic Crystal and Photonic Band Gap • Photonics: “The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon.”1 • Photonic Crystals: (photonic band gap materials), are materials with periodic variation of refractive index. A ph ...
chapter 8
... and exhaust gases can be propelled at speeds much faster than chemical rockets. NASA’s Arc Jet project is an example of such a technology. In addition to the complexity of generating the plasma, these systems are not capable of generating high thrust, so their use at present is limited to station-ke ...
... and exhaust gases can be propelled at speeds much faster than chemical rockets. NASA’s Arc Jet project is an example of such a technology. In addition to the complexity of generating the plasma, these systems are not capable of generating high thrust, so their use at present is limited to station-ke ...
Laser Cutting
... were all exact copies of each other. This meant that together they formed a single electro-magnetic wave. This is known as coherent light. One of the special properties of this coherent light is that it is all at a single frequency. In terms of light, its frequency is its colour. So it is mono-chrom ...
... were all exact copies of each other. This meant that together they formed a single electro-magnetic wave. This is known as coherent light. One of the special properties of this coherent light is that it is all at a single frequency. In terms of light, its frequency is its colour. So it is mono-chrom ...
Experiment 1: Law of Geometrical Optics
... b. Note that there are two reflections to line up as you aim the beam back onto itself. Explain these. (Why isn't there just one?) 5. Scan the angle of the mirror by turning (R) such that the laser beam is reflected onto the piece of paper on the wall. a. Record the new angle in Table 1 (column A) ...
... b. Note that there are two reflections to line up as you aim the beam back onto itself. Explain these. (Why isn't there just one?) 5. Scan the angle of the mirror by turning (R) such that the laser beam is reflected onto the piece of paper on the wall. a. Record the new angle in Table 1 (column A) ...
CALCULATION OF THE FOCAL LENGTH OF A THERMAL LENS
... We have explicitly used an intracavity cell with progressive and regressive waves. On the other hand, in ref. [l], only progressive waves are considered and in refs. [ 121 and [ 171, the situation is treated with cells outside the cavity. The results obtained do not depend on the integration of the ...
... We have explicitly used an intracavity cell with progressive and regressive waves. On the other hand, in ref. [l], only progressive waves are considered and in refs. [ 121 and [ 171, the situation is treated with cells outside the cavity. The results obtained do not depend on the integration of the ...
10 fs ultrafast all-optical switching in polystyrene nonlinear photonic
... All-optical switching has received much attention for a long time due to its potential applications in integrated optics and ultrahigh-speed information processing. Photonic crystal all-optical switching is a promising scheme to realize switching with ultrafast response time.1–6 The refractive index ...
... All-optical switching has received much attention for a long time due to its potential applications in integrated optics and ultrahigh-speed information processing. Photonic crystal all-optical switching is a promising scheme to realize switching with ultrafast response time.1–6 The refractive index ...
The Spectrum Analyzer and The Mode Structure
... laser resonator cavity expands the longer mode cavity may be the cause of the schematic shift in the observed resonance curves.6 Therefore, the data was not collected until the pattern was symmetric. Thereafter, the voltage values and the time values were collected (as shown in Table 1). Since the t ...
... laser resonator cavity expands the longer mode cavity may be the cause of the schematic shift in the observed resonance curves.6 Therefore, the data was not collected until the pattern was symmetric. Thereafter, the voltage values and the time values were collected (as shown in Table 1). Since the t ...
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.