DFB Quantum Cascade Laser Arrays The Harvard community has
... operation at room temperature [3], [4]. QCLs can be grown by metal–organic vapor phase epitaxy (MOVPE) [5] with quality comparable to the best devices grown by molecular beam epitaxy (MBE). Moreover, they can be designed with broadband gain, with full-width at half-maximum (FWHM) of more than 300 cm ...
... operation at room temperature [3], [4]. QCLs can be grown by metal–organic vapor phase epitaxy (MOVPE) [5] with quality comparable to the best devices grown by molecular beam epitaxy (MBE). Moreover, they can be designed with broadband gain, with full-width at half-maximum (FWHM) of more than 300 cm ...
M22I (7x50) - Insight Technology
... US Military specified filters or reticle. You get the same workmanship and quality that goes into each and every M22 delivered to the US Army. Available in black or tan colors and provided with a carry case. FEATURES: • Porro prisms and high efficiency anti-reflection (HEA) coated optics • Rubber ...
... US Military specified filters or reticle. You get the same workmanship and quality that goes into each and every M22 delivered to the US Army. Available in black or tan colors and provided with a carry case. FEATURES: • Porro prisms and high efficiency anti-reflection (HEA) coated optics • Rubber ...
ERBIUM DOPED FIBER AMPLIFIERS (EDFA)
... this purpose though amplifiers using Praseodymium are also in use. EDFAs are used to provide amplification in long distance optical communication with fiber loss less than0.2 dB/km by providing amplification in the long wavelength window near 1550 nm. The principle of rare earth doped fiber amplifie ...
... this purpose though amplifiers using Praseodymium are also in use. EDFAs are used to provide amplification in long distance optical communication with fiber loss less than0.2 dB/km by providing amplification in the long wavelength window near 1550 nm. The principle of rare earth doped fiber amplifie ...
- vjs.ac.vn
... For simplicity, we assume that the radius (a) of the particle is much smaller than the wavelength of the laser (i.e., a ), in this case we can treat the dielectric particle as a point dipole. We also assume that the refractive index of the dielectric particle is n1 and n1 n2 . This is the ne ...
... For simplicity, we assume that the radius (a) of the particle is much smaller than the wavelength of the laser (i.e., a ), in this case we can treat the dielectric particle as a point dipole. We also assume that the refractive index of the dielectric particle is n1 and n1 n2 . This is the ne ...
Get
... advantages over pulsed CRDS, including high repetition rate, high spectral resolution and high signal-to-noise ratio (SNR). Consequently, many applications of CW-CRDS were developed based on the CW laser sources [14–18]. In order to improve the scan frequency precision of laser and detection sensit ...
... advantages over pulsed CRDS, including high repetition rate, high spectral resolution and high signal-to-noise ratio (SNR). Consequently, many applications of CW-CRDS were developed based on the CW laser sources [14–18]. In order to improve the scan frequency precision of laser and detection sensit ...
L-3 Warrior Systems: Insight I EOTech I ETO I IRP I AOC I MV M24I
... specified filters or reticle. You get the same workmanship and quality that goes into each and every M24 delivered to the US Army. Available in black or tan colors and provided with a carry case. FEATURES: • Porro prisms and high efficiency anti-reflection (HEA) coated optics • Rubber “armor” provid ...
... specified filters or reticle. You get the same workmanship and quality that goes into each and every M24 delivered to the US Army. Available in black or tan colors and provided with a carry case. FEATURES: • Porro prisms and high efficiency anti-reflection (HEA) coated optics • Rubber “armor” provid ...
Title Magnetic Light-Matter Interactions in a Photonic Crystal
... degree of control over the propagation of light at the nanoscale [1]. The most striking examples are photonic crystal nanocavities that can trap light in volumes comparable to the cubed wavelength for many optical cycles [2]. Such nanocavities currently have a broader linewidth compared to their mac ...
... degree of control over the propagation of light at the nanoscale [1]. The most striking examples are photonic crystal nanocavities that can trap light in volumes comparable to the cubed wavelength for many optical cycles [2]. Such nanocavities currently have a broader linewidth compared to their mac ...
IOSR Journal of Applied Physics (IOSR-JAP)
... For the preparation of CuxO thin film, the cationic precursor was 0.1M copper sulphate pentahydrate (CuSO4.5H2O) complex, this was obtained by dissolving 1.25g CuSO4.5H2O in 50cm3 of distilled water, while the anionic precursor was 1M sodium hydroxide (NaOH).2.0g of NaOH was dissolved in 50cm3 of di ...
... For the preparation of CuxO thin film, the cationic precursor was 0.1M copper sulphate pentahydrate (CuSO4.5H2O) complex, this was obtained by dissolving 1.25g CuSO4.5H2O in 50cm3 of distilled water, while the anionic precursor was 1M sodium hydroxide (NaOH).2.0g of NaOH was dissolved in 50cm3 of di ...
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.