Laser ranging: a critical review of usual techniques
... pling along the third dimension 共Z axis兲 often requires image pattern centroid location and interpolation. This is where coherence shows its limitation. Indeed, because of the coherent nature of the laser projection, the imaged laser spot on the photodetector共s兲 is corrupted with speckle noise. Here ...
... pling along the third dimension 共Z axis兲 often requires image pattern centroid location and interpolation. This is where coherence shows its limitation. Indeed, because of the coherent nature of the laser projection, the imaged laser spot on the photodetector共s兲 is corrupted with speckle noise. Here ...
Immersion microscopy based on photonic crystal materials
... nanoholes are clearly recognizable). The images of the elements of the array are somewhat distorted due to their position with respect to the mirror (the same as in a conventional parabolic or elliptical mirror) and the degree of distortion is different for different elements depending on their pos ...
... nanoholes are clearly recognizable). The images of the elements of the array are somewhat distorted due to their position with respect to the mirror (the same as in a conventional parabolic or elliptical mirror) and the degree of distortion is different for different elements depending on their pos ...
A tunable low-energy photon source for high
... laser sources: one such source supplies 7 eV photons by using the nonlinear optical crystal KBe2 BO3 F2 to generate the second harmonic of a frequency-tripled Nd:YVO4 laser,4 and a similar 6 eV light source based on the crystal β-BaB2 O4 generates the fourth harmonic of a titanium-sapphire laser.5 A ...
... laser sources: one such source supplies 7 eV photons by using the nonlinear optical crystal KBe2 BO3 F2 to generate the second harmonic of a frequency-tripled Nd:YVO4 laser,4 and a similar 6 eV light source based on the crystal β-BaB2 O4 generates the fourth harmonic of a titanium-sapphire laser.5 A ...
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... a relative dielectric constant, and 0 a dielectric constant of the vacuum. The carrier transport model of photogenerated carriers in the colored DAE film is attributed to a hopping model with potential barriers between the closed-ring molecules. In Fig. 6, the higher efficiency obtained with the 41 ...
... a relative dielectric constant, and 0 a dielectric constant of the vacuum. The carrier transport model of photogenerated carriers in the colored DAE film is attributed to a hopping model with potential barriers between the closed-ring molecules. In Fig. 6, the higher efficiency obtained with the 41 ...
Physics 476LW Advanced Physics Laboratory Polarization
... or elliptically polarized. Additionally, unpolarized light may become polarized due to interactions with matter, via scattering and reflection. There are many phenomena that may rotate linearly polarized light. In this lab we will study one phenomenon, optical activity. When light is reflected at an ...
... or elliptically polarized. Additionally, unpolarized light may become polarized due to interactions with matter, via scattering and reflection. There are many phenomena that may rotate linearly polarized light. In this lab we will study one phenomenon, optical activity. When light is reflected at an ...
Extinction Coefficient Measurements of Turbid Media
... A 1 mW He–Ne laser source emitting at 632.8 nm operating in continuous wave (cw) [which has proved suitable for low-power laser interaction with matter], was directed horizontally to a cell (glass box) of thickness 25 mm containing the sample . The collimated transmitted (unscattered ) light was det ...
... A 1 mW He–Ne laser source emitting at 632.8 nm operating in continuous wave (cw) [which has proved suitable for low-power laser interaction with matter], was directed horizontally to a cell (glass box) of thickness 25 mm containing the sample . The collimated transmitted (unscattered ) light was det ...
Lab 7: Fabry-Perot Interferometer
... which is also called the FWHM (Full Width Half Max- number of nodes in the standing waves in the cavity imum). This is a measure of the resolving power of can change. If the wavelength of light changes, a difthe instrument, which is clearly related to the co- ferent number of nodes will be accommoda ...
... which is also called the FWHM (Full Width Half Max- number of nodes in the standing waves in the cavity imum). This is a measure of the resolving power of can change. If the wavelength of light changes, a difthe instrument, which is clearly related to the co- ferent number of nodes will be accommoda ...
Sodium vapor cell laser guide star experiments for continuous wave
... vapor pressure of sodium and its atomic density. The absorption cross-section of the sodium D2 line (32 S1/2 → 32 P3/2 ) is shown in Figure 1 for temperatures of 170 K (mesosphere) and 383 K (laboratory). The highest cross-section peak is centered at the v0 frequency which corresponds to the 32 S1/2 ...
... vapor pressure of sodium and its atomic density. The absorption cross-section of the sodium D2 line (32 S1/2 → 32 P3/2 ) is shown in Figure 1 for temperatures of 170 K (mesosphere) and 383 K (laboratory). The highest cross-section peak is centered at the v0 frequency which corresponds to the 32 S1/2 ...
AR26272276
... telecommunications are able to transfer voice and computer images and data with a speed that is one hundred times more than telecommunications networks with copper cables [1]. The process and alteration of optical signals into electric current is troublesome in high speeds, so if the width of optica ...
... telecommunications are able to transfer voice and computer images and data with a speed that is one hundred times more than telecommunications networks with copper cables [1]. The process and alteration of optical signals into electric current is troublesome in high speeds, so if the width of optica ...
Photonic mm-Wave Local Oscillator - Harvard
... operational current) and measured the photodiode current as a function of laser temperature (wavelength) at several modulation frequencies. As seen in Figure 4, we find a sinusoidal behavior of photodiode current with respect to laser temperature. Although the amplitude of the sinusoid depends on mo ...
... operational current) and measured the photodiode current as a function of laser temperature (wavelength) at several modulation frequencies. As seen in Figure 4, we find a sinusoidal behavior of photodiode current with respect to laser temperature. Although the amplitude of the sinusoid depends on mo ...
PDF
... and they did not use entanglement resources. Recently, however, several groups have proposed the use of deterministic logic gates in conjunction with sources of entangled or hyperentangled (i.e., entangled in more than one degree of freedom) photons to execute simple quantum protocols. The combinati ...
... and they did not use entanglement resources. Recently, however, several groups have proposed the use of deterministic logic gates in conjunction with sources of entangled or hyperentangled (i.e., entangled in more than one degree of freedom) photons to execute simple quantum protocols. The combinati ...
PRELIMINARY STUDY ON PHOTONIC CRYSTAL
... Biodiversities and animals in Indonesia have been recognized internationally. However their use is very limited, especially in the world of science and technology. Nowadays, the development of world science and technology begin to shift in the direction of research and utilization of the natural str ...
... Biodiversities and animals in Indonesia have been recognized internationally. However their use is very limited, especially in the world of science and technology. Nowadays, the development of world science and technology begin to shift in the direction of research and utilization of the natural str ...
PRELIMINARY STUDY ON PHOTONIC CRYSTAL
... index different then the reflected wavelength will be different. Photonic crystal can be made with hollow material structure is perfect. In a photonic crystal cavity can be filled with air (n = 1), water (n = 1,333), or other solutions. Perfect hollow photonic crystal structure like this is very use ...
... index different then the reflected wavelength will be different. Photonic crystal can be made with hollow material structure is perfect. In a photonic crystal cavity can be filled with air (n = 1), water (n = 1,333), or other solutions. Perfect hollow photonic crystal structure like this is very use ...
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.