... Modelocking is a technique in optics by which a laser can be made to produce pulses of light of extremely short duration, on the order of picoseconds (10-12s) or femtoseconds (10-15s).The basis of the technique is to induce a fixed phase relationship between the modes of the laser's resonant cavity. ...
MLSystems Lab 1 - Fourier v4 - RIT
... represented as terms in the harmonic decomposition of m(x) correspond to the discrete orders seen in above. The zeroth order (centered at u = 0) corresponds to the constant DC term A/2. At either side are the +/- first orders, where u1 = 1/p. The +/-second orders correspond to u2 = +/-2/p, and so on ...
... represented as terms in the harmonic decomposition of m(x) correspond to the discrete orders seen in above. The zeroth order (centered at u = 0) corresponds to the constant DC term A/2. At either side are the +/- first orders, where u1 = 1/p. The +/-second orders correspond to u2 = +/-2/p, and so on ...
Optical gratings: Nano-engineered lenses - MiNa
... these gratings has been their use as highly efficient and compact replacements for distributed Bragg reflectors in vertical-cavity surface-emitting lasers (VCSELs). Because SWGs are thin (~150 nm, for example) and lightweight they can be moved quickly, allowing rapid wavelength tuning, which is usef ...
... these gratings has been their use as highly efficient and compact replacements for distributed Bragg reflectors in vertical-cavity surface-emitting lasers (VCSELs). Because SWGs are thin (~150 nm, for example) and lightweight they can be moved quickly, allowing rapid wavelength tuning, which is usef ...
Optics and Quantum Electronics E. P. Ippen
... The carrier-envelope phase of pulses emerging from a laser is not known a priori, and it generally slips from pulse to pulse because the roundtrip phase delay in a laser is usually not the same as the roundtrip group delay. Nonlinear optical measurements that are sensitive to this carrierenvelope ph ...
... The carrier-envelope phase of pulses emerging from a laser is not known a priori, and it generally slips from pulse to pulse because the roundtrip phase delay in a laser is usually not the same as the roundtrip group delay. Nonlinear optical measurements that are sensitive to this carrierenvelope ph ...
Luminescence properties of a Fibonacci photonic
... lamp as the white light excitation source. Light from the excitation source was focused to spot size of approximately 1mm in diameter, thus averaging out spatial inhomogeneities arising from spin coating. The reflected light was collected by a fiber coupled spectrometer. Continuous wave PL measureme ...
... lamp as the white light excitation source. Light from the excitation source was focused to spot size of approximately 1mm in diameter, thus averaging out spatial inhomogeneities arising from spin coating. The reflected light was collected by a fiber coupled spectrometer. Continuous wave PL measureme ...
Time of flight-photoemission electron microscope for ultrahigh
... 20 eV and the laser signal was used as a time marker for DLD. The slices are extracted from the full 3D (x, y, t) data stack by setting a condition for the arrival time of the photoelectrons in the TOF operation mode. Photoelectron generation with a 400 nm laser is a 2PPE process. This can be seen i ...
... 20 eV and the laser signal was used as a time marker for DLD. The slices are extracted from the full 3D (x, y, t) data stack by setting a condition for the arrival time of the photoelectrons in the TOF operation mode. Photoelectron generation with a 400 nm laser is a 2PPE process. This can be seen i ...
Intersatellite laser ranging instrument for the GRACE
... variable ionospheric delays. It is important to note that the two satellites effectively comprise a single measurement system. Estimates of the gravity field are derived from observations obtained from a range of on-board instruments. In addition to the microwave ranging system each satellite includ ...
... variable ionospheric delays. It is important to note that the two satellites effectively comprise a single measurement system. Estimates of the gravity field are derived from observations obtained from a range of on-board instruments. In addition to the microwave ranging system each satellite includ ...
Optical Micrometer
... Optical Micrometer The light source for this experiment is a low-power helium-neon laser with a wavelength of 632.8 nm. Never look directly at a laser beam nor permit anyone else to do so! Exposure to the direct or reflected beam for more than a few seconds will cause serious eye damage. Do not pick ...
... Optical Micrometer The light source for this experiment is a low-power helium-neon laser with a wavelength of 632.8 nm. Never look directly at a laser beam nor permit anyone else to do so! Exposure to the direct or reflected beam for more than a few seconds will cause serious eye damage. Do not pick ...
Experimental Competition
... Use only the front side of the paper. Begin each part of the problem on a separate sheet. For each question, in addition to the blank sheets where you may write, there is an answer form where you must summarize the results you have obtained. Numerical results should be written with as many digits as ...
... Use only the front side of the paper. Begin each part of the problem on a separate sheet. For each question, in addition to the blank sheets where you may write, there is an answer form where you must summarize the results you have obtained. Numerical results should be written with as many digits as ...
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.