Picosecond-pulse amplification with an external passive optical cavity
... require pulse energies as high as several millijoules and would benefit from higher repetition rates. Ti:sapphire regenerative amplifiers are capable of generating high-repetition-rate pulse trains (250 kHz) with microjoule pulse energies.2 Alternatively, pulses with moderate energies have been obta ...
... require pulse energies as high as several millijoules and would benefit from higher repetition rates. Ti:sapphire regenerative amplifiers are capable of generating high-repetition-rate pulse trains (250 kHz) with microjoule pulse energies.2 Alternatively, pulses with moderate energies have been obta ...
CW mode-locked dye lasers for ultra fast spectroscopic studies
... traces of the pulses recorded using a zero-background second harmonic generation technique which will be described in detail in the next section. Assuming the pulses to be exponential /sech2 l2 I3 the shortest pulse in Fig. 5 has a fwhm of 6.4 ps which is close to transform limited for the laser ban ...
... traces of the pulses recorded using a zero-background second harmonic generation technique which will be described in detail in the next section. Assuming the pulses to be exponential /sech2 l2 I3 the shortest pulse in Fig. 5 has a fwhm of 6.4 ps which is close to transform limited for the laser ban ...
NPM-O22 Influences of different low level laser power at
... scattering coefficient, absorption coefficient, anisotropy factor, and the separation between the source and the observation point. Laser-tissue interaction mechanisms are a function of wavelength, power, and pulse duration. The penetration depth of the laser light depends upon the optical propertie ...
... scattering coefficient, absorption coefficient, anisotropy factor, and the separation between the source and the observation point. Laser-tissue interaction mechanisms are a function of wavelength, power, and pulse duration. The penetration depth of the laser light depends upon the optical propertie ...
c =λ* f λ = wavelength
... Later was the achievement of population inversion by pumping (optical pumping) in 1955 then was the design of solid state masers (Ruby) in 1957. There was a great hope to extend the application of the stimulated emission to the visible part of the electro-magnetic spectrum (later called the Optical ...
... Later was the achievement of population inversion by pumping (optical pumping) in 1955 then was the design of solid state masers (Ruby) in 1957. There was a great hope to extend the application of the stimulated emission to the visible part of the electro-magnetic spectrum (later called the Optical ...
Ph 76 ADVANCED PHYSICS LABORATORY — ATOMIC
... If the atoms in the vapor cell had a single excited state but two hyperfine ground states (we call them both “ground” states because neither can decay via an allowed transition), and the separation of the ground states was less than the Doppler width, then one might see a spectrum like in Figure 4. ...
... If the atoms in the vapor cell had a single excited state but two hyperfine ground states (we call them both “ground” states because neither can decay via an allowed transition), and the separation of the ground states was less than the Doppler width, then one might see a spectrum like in Figure 4. ...
IEEE J. Quant. Electron. 24, 431 - Department of Physics
... quent modifications [2], was the only available source of the extracted ultraviolet beam. Intracavity frequency douoptical pulses less than 100 fs in duration. Recently sev- bling has been applied previously to synchronously modeeral investigators [3]-[8] have developed new femtosec- locked picoseco ...
... quent modifications [2], was the only available source of the extracted ultraviolet beam. Intracavity frequency douoptical pulses less than 100 fs in duration. Recently sev- bling has been applied previously to synchronously modeeral investigators [3]-[8] have developed new femtosec- locked picoseco ...
Tutorial for Chapter 8
... A Gaussian beam of Rayleigh range z0 = 50 cm and wavelength = 488 nm is converted into another Gaussian beam with using a lens of focal length f = 5 cm at a distance z = 75 cm. Find the beam waist and location (from the lens) for the new Gaussian beam. ...
... A Gaussian beam of Rayleigh range z0 = 50 cm and wavelength = 488 nm is converted into another Gaussian beam with using a lens of focal length f = 5 cm at a distance z = 75 cm. Find the beam waist and location (from the lens) for the new Gaussian beam. ...
The Fresnel Biprism
... tightly packed interference pattern and as a result, there are more fringes spaced closer together. There was some potential error in setting up the system in that the rib of the prism was meant to be at the centre of the illuminated area, this is fairly subjective as the area surrounding the rib wa ...
... tightly packed interference pattern and as a result, there are more fringes spaced closer together. There was some potential error in setting up the system in that the rib of the prism was meant to be at the centre of the illuminated area, this is fairly subjective as the area surrounding the rib wa ...
Optical Cavity and laser Modes
... • The cavity mirrors are not exactly aligned perpendicular to the laser axis, and parallel to each other (symmetric), the radiation inside the cavity will not be confined during its path between the mirrors. • Absorption, scattering and losses in optical elements Since optical elements are not ideal ...
... • The cavity mirrors are not exactly aligned perpendicular to the laser axis, and parallel to each other (symmetric), the radiation inside the cavity will not be confined during its path between the mirrors. • Absorption, scattering and losses in optical elements Since optical elements are not ideal ...
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.