Total internal reflection photonic crystal prism
... interface, as shown in Fig. 2(A). Small regions around each 30˚ vertex have been removed because they do not substantially effect light propagation. Three input waveguides each of which is 3 μm wide and separated from each other by 5 μm, terminate 68 μm from the PC prism, as shown in the lower right ...
... interface, as shown in Fig. 2(A). Small regions around each 30˚ vertex have been removed because they do not substantially effect light propagation. Three input waveguides each of which is 3 μm wide and separated from each other by 5 μm, terminate 68 μm from the PC prism, as shown in the lower right ...
Barnett
... • Photons have played a central role in the development of quantum theory and the quantum theory of light continues to ...
... • Photons have played a central role in the development of quantum theory and the quantum theory of light continues to ...
Coherent Optical Information Systems
... bate at ⫽ 514 nm (19). The maximum reflecoccurs as different portions of this broad specavailability of coherent light sources has been tivity is at the Bragg wavelength ⫽ 1550 nm trum reach the destination with different delays. the key innovation enabling the rapid rise of (Fig. 4). Notice tha ...
... bate at ⫽ 514 nm (19). The maximum reflecoccurs as different portions of this broad specavailability of coherent light sources has been tivity is at the Bragg wavelength ⫽ 1550 nm trum reach the destination with different delays. the key innovation enabling the rapid rise of (Fig. 4). Notice tha ...
Laser spectroscopy and quantum optics
... laser frequency is tuned to the center of a Dopplerbroadened line, the two beams can interact with the same atoms, which can only be those at rest or moving sideways. V. Chebotaev in Novosibirsk was the first to realize that Doppler broadening in two-photon spectroscopy can be eliminated without any ...
... laser frequency is tuned to the center of a Dopplerbroadened line, the two beams can interact with the same atoms, which can only be those at rest or moving sideways. V. Chebotaev in Novosibirsk was the first to realize that Doppler broadening in two-photon spectroscopy can be eliminated without any ...
Efficient output coupling of intracavity high harmonic generation
... power scalability. It also introduces substantially smaller losses than coupling the harmonic radiation out of the cavity through a small hole in a curved mirror. We add an optic directly after the intracavity focus. The element acts as a diffraction grating for all harmonic orders and yet, is a nea ...
... power scalability. It also introduces substantially smaller losses than coupling the harmonic radiation out of the cavity through a small hole in a curved mirror. We add an optic directly after the intracavity focus. The element acts as a diffraction grating for all harmonic orders and yet, is a nea ...
Double-pass acousto-optic modulator system
... time scales shorter than 1 ms, and it may be that laser beams with several different frequencies must be produced from a single laser source. Acousto-optic modulators 共AOMs兲 are widely used to accomplish the frequency control in laser cooling experiments. When the laser frequency is scanned with an ...
... time scales shorter than 1 ms, and it may be that laser beams with several different frequencies must be produced from a single laser source. Acousto-optic modulators 共AOMs兲 are widely used to accomplish the frequency control in laser cooling experiments. When the laser frequency is scanned with an ...
Laser Bleaching of Carbon Nanotubes Suspension in
... ethylene thermal catalytic decomposition on the Fe/Co catalysts were used in experiments. The MWNTs average diameter and length were 7-9 nm and 10-20 µm respectively (Figure 1a and 1b). The suspension of tubes in DMF with the MWNTs concentration of 0.015 g/l was dispersed ultrasonically (22 kHz, 30 ...
... ethylene thermal catalytic decomposition on the Fe/Co catalysts were used in experiments. The MWNTs average diameter and length were 7-9 nm and 10-20 µm respectively (Figure 1a and 1b). The suspension of tubes in DMF with the MWNTs concentration of 0.015 g/l was dispersed ultrasonically (22 kHz, 30 ...
Laser Frequency and Time 1 Introduction
... including J.L. Hall from JILA who remained skeptical at that time, but later became a main driving force for a series of beautiful experiments in Boulder. My confidence was based on more than just the Florence experiment. At Stanford University in the late 1970s, we had shown that a mode-locked pico ...
... including J.L. Hall from JILA who remained skeptical at that time, but later became a main driving force for a series of beautiful experiments in Boulder. My confidence was based on more than just the Florence experiment. At Stanford University in the late 1970s, we had shown that a mode-locked pico ...
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.