Raman Scattering in Solids
... sample holder. Typical values for this laser heating effect are between 1 and 10 K/mW. The backscattered light is collected with an objective lens (fig. 8) with large aperture and focused on the entrance slit of a highly dispersive and selective grating spectrometer. In spite of the good selectivity ...
... sample holder. Typical values for this laser heating effect are between 1 and 10 K/mW. The backscattered light is collected with an objective lens (fig. 8) with large aperture and focused on the entrance slit of a highly dispersive and selective grating spectrometer. In spite of the good selectivity ...
Optical Components and Devices for Next-Generation
... electric/transverse magnetic (TE/TM) mode conversion resulting from acousto-optic effects between surface acoustic waves (SAWs) and light. The wavelength is selected by changing the RF frequency used to generate the SAW. AOTFs are very attractive devices for WDM systems because they can be switched ...
... electric/transverse magnetic (TE/TM) mode conversion resulting from acousto-optic effects between surface acoustic waves (SAWs) and light. The wavelength is selected by changing the RF frequency used to generate the SAW. AOTFs are very attractive devices for WDM systems because they can be switched ...
Pulsed Quasi-monochromatic x-ray source for radiography
... between x-ray source to target and target to detector (which is required to record an event (laser shocked target) of size approximately 150 to 200 µm). The x-ray radiograph of S. S. wire, S. S. mesh and 20 µm Al foil have been recorded. Figure 4a shows the optical microscope image of the 400 µm thi ...
... between x-ray source to target and target to detector (which is required to record an event (laser shocked target) of size approximately 150 to 200 µm). The x-ray radiograph of S. S. wire, S. S. mesh and 20 µm Al foil have been recorded. Figure 4a shows the optical microscope image of the 400 µm thi ...
The Optical Cavity
... to different cavity modes (longitudinal and transverse) at different points in time. Remember that resonant coupling will only occur when at least one of the frequency components of the laser light matches at least one of the mode frequencies of the external cavity (which are changing in time due to ...
... to different cavity modes (longitudinal and transverse) at different points in time. Remember that resonant coupling will only occur when at least one of the frequency components of the laser light matches at least one of the mode frequencies of the external cavity (which are changing in time due to ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
... The forces exerted on the object result from the interaction between the laser and the refractive index mismatch of the object with its environment and are of the order of pico-newtons. [1] 1.1 Principles of Optical Tweezers An optical trap is formed by tightly focusing a laser beam with an objectiv ...
... The forces exerted on the object result from the interaction between the laser and the refractive index mismatch of the object with its environment and are of the order of pico-newtons. [1] 1.1 Principles of Optical Tweezers An optical trap is formed by tightly focusing a laser beam with an objectiv ...
Collimation Tester - Newport Corporation
... Tester offers the researcher a simpler approach. The Newport Collimation Tester 20QS20 makes use of a technique called “Shearing Interferometry.” This is a null method used to test the collimation of laser light whose coherence length is long compared to the thickness of the collimation tester. The ...
... Tester offers the researcher a simpler approach. The Newport Collimation Tester 20QS20 makes use of a technique called “Shearing Interferometry.” This is a null method used to test the collimation of laser light whose coherence length is long compared to the thickness of the collimation tester. The ...
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... cannot exist but light can be localized by defects that support evanescent defect states or DMs [1,2]. In waveguide lattices, often the analysis of how a monochromatic light field distributes itself focuses on the band-gap diagrams of spatial frequency modes (propagation constant vs transverse wave ...
... cannot exist but light can be localized by defects that support evanescent defect states or DMs [1,2]. In waveguide lattices, often the analysis of how a monochromatic light field distributes itself focuses on the band-gap diagrams of spatial frequency modes (propagation constant vs transverse wave ...
Designing Fiber Optic Systems
... Electrical to optical video converters generally have a BNC coaxial cable connector at the input and a fiber optic connector on the output. In order to get the digital bits down the fiber optic cable, a light emitting device is used, onto which the digital signal is modulated. Either a laser or an L ...
... Electrical to optical video converters generally have a BNC coaxial cable connector at the input and a fiber optic connector on the output. In order to get the digital bits down the fiber optic cable, a light emitting device is used, onto which the digital signal is modulated. Either a laser or an L ...
Frequency domain optical parametric amplification - few
... focused to a 200 mm spot size in the FP. This spot size in combination with grating dispersion and focal length of M1 define the seed pulse duration in the FP, which is about 1.4ps as explained in the Methods section and supplementary Fig. 2. The FP contains four identical type I BBO crystals. Each c ...
... focused to a 200 mm spot size in the FP. This spot size in combination with grating dispersion and focal length of M1 define the seed pulse duration in the FP, which is about 1.4ps as explained in the Methods section and supplementary Fig. 2. The FP contains four identical type I BBO crystals. Each c ...
Performance evaluation of the free space optical (FSO)
... generally takes place in three different ways: amplitude modulation (AM), frequency modulation (FM), or phase modulation (PM), each of which can be theoretically implemented at any frequency. For an optical wave, another modulation scheme is also often used, namely intensity modulation (IM). Intensi ...
... generally takes place in three different ways: amplitude modulation (AM), frequency modulation (FM), or phase modulation (PM), each of which can be theoretically implemented at any frequency. For an optical wave, another modulation scheme is also often used, namely intensity modulation (IM). Intensi ...
Accurate calculation of the local density of optical states in inverse
... fields En,k共r兲 are not invariant under the lattice pointgroup operations ␣, as first reported in [33]. Explicitly, this means that the projection of the field of a mode at wave vector k on the dipole orientation ed, [i.e., 兩ed · En,k共r兲兩], is not identical to 兩ed · En,␣关k兴共r兲兩, i.e., the projection ...
... fields En,k共r兲 are not invariant under the lattice pointgroup operations ␣, as first reported in [33]. Explicitly, this means that the projection of the field of a mode at wave vector k on the dipole orientation ed, [i.e., 兩ed · En,k共r兲兩], is not identical to 兩ed · En,␣关k兴共r兲兩, i.e., the projection ...
Post-print of: J. Mater. Chem. , 2010, 20, 6408
... materials with multiple functionalities. Their potential interest as sensing materials, since they combine the presence of accessible porosity with high optical quality, have been demonstrated by analyzing their response when exposed to different relative humidity environments.23 To date, no multila ...
... materials with multiple functionalities. Their potential interest as sensing materials, since they combine the presence of accessible porosity with high optical quality, have been demonstrated by analyzing their response when exposed to different relative humidity environments.23 To date, no multila ...
1 Introduction - Stony Brook Laser Teaching Center
... mode is a beam with its two halves mutually π out of phase and destructively interfering in the center. This can be simulated by introducing a phase element to dissect the beam into two halves [9]. The phase element is adjusted, using an interferometer, to create an exact π phase shift, as shown in ...
... mode is a beam with its two halves mutually π out of phase and destructively interfering in the center. This can be simulated by introducing a phase element to dissect the beam into two halves [9]. The phase element is adjusted, using an interferometer, to create an exact π phase shift, as shown in ...
PASSION FOR PRECISION
... frequency differences rather than the frequencies themselves so that one could stay in a convenient region of the electromagnetic spectrum such as the near infrared where compact diode laser sources are available [27]. The basic building block is an interval divider stage with a laser that is servo ...
... frequency differences rather than the frequencies themselves so that one could stay in a convenient region of the electromagnetic spectrum such as the near infrared where compact diode laser sources are available [27]. The basic building block is an interval divider stage with a laser that is servo ...
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.