Interference experiments with the fluorescence light of Ba ions
... been reported [34] that the optical dipole forces act on the trajectories of the falling atom, and, recently, that atoms can be trapped inside the cavity by these optical dipole forces for a short time [35]. However, it has not been possible yet to store an atom inside a cavity for an extended perio ...
... been reported [34] that the optical dipole forces act on the trajectories of the falling atom, and, recently, that atoms can be trapped inside the cavity by these optical dipole forces for a short time [35]. However, it has not been possible yet to store an atom inside a cavity for an extended perio ...
Quantum manipulation on the Barium quadrupolar transition
... For all these purposes it is important to have a well controlled quantum system, which means that one needs to be able to prepare a well defined quantum state, realize the desired manipulations and then perform reliable state readout. In the case of trapped ions the internal and external degrees of ...
... For all these purposes it is important to have a well controlled quantum system, which means that one needs to be able to prepare a well defined quantum state, realize the desired manipulations and then perform reliable state readout. In the case of trapped ions the internal and external degrees of ...
Specific rate constants k(E,J) for the dissociation of NO 2 . I. Time
... prior to ps-excitation and subsequent decomposition of the molecules. With this technique the rotational quantum number of dissociating molecules was well-defined without, however, being able to have full energy resolution of the excited molecules. In addition, the range of accessible J- and K-value ...
... prior to ps-excitation and subsequent decomposition of the molecules. With this technique the rotational quantum number of dissociating molecules was well-defined without, however, being able to have full energy resolution of the excited molecules. In addition, the range of accessible J- and K-value ...
ATOMIC, MOLECULAR AND OPTICAL PHYSICS J. Phys. B
... negative ions dates back to the work of Berson [26] and Manakov and Rapoport [27] for circular polarization and of Manakov and Fainshtein [28] for linear polarization, who concentrated on the quasi-energy of the ground state; see also [29–32]. Above-threshold detachment spectra for a finite pulse we ...
... negative ions dates back to the work of Berson [26] and Manakov and Rapoport [27] for circular polarization and of Manakov and Fainshtein [28] for linear polarization, who concentrated on the quasi-energy of the ground state; see also [29–32]. Above-threshold detachment spectra for a finite pulse we ...
IEEE J. Quantum Electron. 33, 970 (1997)
... the injected carrier density is much larger than its thermal equilibrium value. Fig. 1 shows the physics of the electron-hole recombinationenhanced defect generation mechanism. The band diagram shows that an electron in the conduction band is captured at a defect level with a subsequent capture of a ...
... the injected carrier density is much larger than its thermal equilibrium value. Fig. 1 shows the physics of the electron-hole recombinationenhanced defect generation mechanism. The band diagram shows that an electron in the conduction band is captured at a defect level with a subsequent capture of a ...
New concept of laser fusion driver using Stimulated Brillouin
... 1. A cross type amplifier using SBS-PCM has many advantages such as the alignment insensitiveness, the stable beam pointing, and the perfect optical isolation. 2. Pre-pulse technique is expected to suppress the deformation of the SBS wave 3. Phase controlling of the SBS wave has been successfully ac ...
... 1. A cross type amplifier using SBS-PCM has many advantages such as the alignment insensitiveness, the stable beam pointing, and the perfect optical isolation. 2. Pre-pulse technique is expected to suppress the deformation of the SBS wave 3. Phase controlling of the SBS wave has been successfully ac ...
High-temperature ultrafast polariton parametric amplification in
... the excitation angle (Fig. 1). A small number of states can be excited at a given angle, and quantum degeneracy (more than one polariton per state) is achieved with relatively low excitation densities. The bosonic statistics strongly enhances some particular scattering processes, provided that the d ...
... the excitation angle (Fig. 1). A small number of states can be excited at a given angle, and quantum degeneracy (more than one polariton per state) is achieved with relatively low excitation densities. The bosonic statistics strongly enhances some particular scattering processes, provided that the d ...
New Approaches to Gyroscopic Lasers
... phosphate glass lasers were constructed. Initially linear cavity designs were constructed to test the suitability of the gain media. Both laser systems employed longitudinal laser diode pumping. Thirty six perimeter ring lasers were then developed using both gain media. In both cases successful rota ...
... phosphate glass lasers were constructed. Initially linear cavity designs were constructed to test the suitability of the gain media. Both laser systems employed longitudinal laser diode pumping. Thirty six perimeter ring lasers were then developed using both gain media. In both cases successful rota ...
Laser Sources for Confocal Microscopy
... the laser medium. This can be another laser, arc lamp or flash lamp, electron beam, proton beam, electrical current, electrical discharge or radio frequency (RF) excitation, etc. The choice of pump source is determined by the optical, thermal, and mechanical properties of the active medium and the w ...
... the laser medium. This can be another laser, arc lamp or flash lamp, electron beam, proton beam, electrical current, electrical discharge or radio frequency (RF) excitation, etc. The choice of pump source is determined by the optical, thermal, and mechanical properties of the active medium and the w ...
Laser Sources for Confocal Microscopy
... photons absorbed = ( flux per pixel) ¥ (OD) = 2 ¥ 105 ( s * pixel * mW ) at 500 nm. Assuming a quantum yield of 0.8 and a collection efficiency of 10%, the detector receives photons at the detector = 1.6 ¥ 10 4 (s * pixel * mW of incident light). Given the quantum efficiency for a good detector (10% ...
... photons absorbed = ( flux per pixel) ¥ (OD) = 2 ¥ 105 ( s * pixel * mW ) at 500 nm. Assuming a quantum yield of 0.8 and a collection efficiency of 10%, the detector receives photons at the detector = 1.6 ¥ 10 4 (s * pixel * mW of incident light). Given the quantum efficiency for a good detector (10% ...
Local-Field Effects and Nanostructuring for Controlling Optical
... Ph. D. research. The first project is on composite laser gain media. It involves both nanostructuring and using local-field effects to control the basic laser parameters, such as the radiative lifetime, small-signal gain and absorption, and the saturation intensity. While being involved in this proj ...
... Ph. D. research. The first project is on composite laser gain media. It involves both nanostructuring and using local-field effects to control the basic laser parameters, such as the radiative lifetime, small-signal gain and absorption, and the saturation intensity. While being involved in this proj ...
Optical Breakdown in Liquid Suspensions and Its Analytical
... that reveals nonuniformities in transparent media such as air, water, or glass [33–42]. Regular vision and optical inspection methods are not sensitive to temperature differences, to variations in gas composition, or to shockwaves in air. However, these disturbances refract light, so they can cast s ...
... that reveals nonuniformities in transparent media such as air, water, or glass [33–42]. Regular vision and optical inspection methods are not sensitive to temperature differences, to variations in gas composition, or to shockwaves in air. However, these disturbances refract light, so they can cast s ...
Soliton collision and Raman gain regimes in continuous
... the same output power at the Raman Stokes wavelength (downshifted from the pump by 13.2 THz) as Raman amplification of spontaneous emission along the fiber length [22]. However, as we show in Fig. 1(right) this approach suffers mainly from two drawbacks: (1) There is no inherent spectral linewidth, ...
... the same output power at the Raman Stokes wavelength (downshifted from the pump by 13.2 THz) as Raman amplification of spontaneous emission along the fiber length [22]. However, as we show in Fig. 1(right) this approach suffers mainly from two drawbacks: (1) There is no inherent spectral linewidth, ...
Rubidium resonant squeezed light from a diode-pumped
... The underlying mechanism which results in quadrature squeezing was investigated theoretically in a number of publications. Walls and Millburn were the rst to estimate the achievable amount of squeezing in an OPO [45]. They predicted perfect squeezing to be found at the threshold of the optical para ...
... The underlying mechanism which results in quadrature squeezing was investigated theoretically in a number of publications. Walls and Millburn were the rst to estimate the achievable amount of squeezing in an OPO [45]. They predicted perfect squeezing to be found at the threshold of the optical para ...
Erbium-implanted high-Q silica toroidal microcavity laser
... to the advantages in fabrication, these devices provide improved spectral performance as compared to microspheres owing to their reduced modal spectra [16,18]. In particular, single-mode operation was possible in these devices. As a complementary method of gain functionalization that is more compati ...
... to the advantages in fabrication, these devices provide improved spectral performance as compared to microspheres owing to their reduced modal spectra [16,18]. In particular, single-mode operation was possible in these devices. As a complementary method of gain functionalization that is more compati ...
Optics and Quantum Electronics
... spectroscopy, ultrashort pulse laser sources at these high repetition rates are desired. In this project, pulses as short as 5 fs have been obtained directly from a Kerr-Lens modelocked Ti:sapphire laser9 at 100 MHz repetition rate with an average output power of up to 200 mW. This has been made pos ...
... spectroscopy, ultrashort pulse laser sources at these high repetition rates are desired. In this project, pulses as short as 5 fs have been obtained directly from a Kerr-Lens modelocked Ti:sapphire laser9 at 100 MHz repetition rate with an average output power of up to 200 mW. This has been made pos ...
The Graduate School Eberly College of Science
... L1 drive the atom from the ground state to a virtually excited intermediate state i. Laser L2 then drives the atom from state i back to the desired excited state. It is important to note that the population in state i is virtual, and losses due to spontaneous emission are not allowed. By employing t ...
... L1 drive the atom from the ground state to a virtually excited intermediate state i. Laser L2 then drives the atom from state i back to the desired excited state. It is important to note that the population in state i is virtual, and losses due to spontaneous emission are not allowed. By employing t ...
Ultrafast Internal Conversion of Aromatic Molecules Studied
... crossing between multi-dimensional potential energy surfaces [2–5]. The conical intersection facilitates efficient draining of a nuclear wave packet from an upper to a lower potential energy surface. Photoelectron spectroscopy, initiated in the late 1950s to early 1960s, [6–8] induces emission of an ...
... crossing between multi-dimensional potential energy surfaces [2–5]. The conical intersection facilitates efficient draining of a nuclear wave packet from an upper to a lower potential energy surface. Photoelectron spectroscopy, initiated in the late 1950s to early 1960s, [6–8] induces emission of an ...
Optics and Quantum Electronics - Research Laboratory of Electronics
... mirrors developed in our group, provide high reflectivity and well controlled dispersion over 400 nm in the case of single mirrors or even over one octave using specially matched mirror pairs. These components are a prerequisite for miniaturized ultrabroadband femtosecond lasers necessary for biomed ...
... mirrors developed in our group, provide high reflectivity and well controlled dispersion over 400 nm in the case of single mirrors or even over one octave using specially matched mirror pairs. These components are a prerequisite for miniaturized ultrabroadband femtosecond lasers necessary for biomed ...
Metal-optic and Plasmonic Semiconductor
... Over the past few decades, semiconductor lasers have relentlessly followed the path towards miniaturization. Smaller lasers are more energy efficient, are cheaper to make, and open up new applications in sensing and displays, among many other things. Yet, up until recently, there was a fundamental p ...
... Over the past few decades, semiconductor lasers have relentlessly followed the path towards miniaturization. Smaller lasers are more energy efficient, are cheaper to make, and open up new applications in sensing and displays, among many other things. Yet, up until recently, there was a fundamental p ...
Coherent population trapping resonances at lower atomic
... resonant transition |1ñ ® |3ñ. This transmission is defined by the difference between populations of levels |1ñ and |3ñ. However, the detected CPT peak is determined mainly by the trapped atomic population at the lower level |1ñ in the nonclosed L-system (Fig. 1) because of negligible population of ...
... resonant transition |1ñ ® |3ñ. This transmission is defined by the difference between populations of levels |1ñ and |3ñ. However, the detected CPT peak is determined mainly by the trapped atomic population at the lower level |1ñ in the nonclosed L-system (Fig. 1) because of negligible population of ...
- sfo
... In DFB lasers, the position of the grating relative to the output facets strongly influences the laser threshold and the optical spectrum. ϕ is the phase of the modulator output facet relative to the grating. The resolution of the complex oscillation condition (Eq. 4) gives the DFB modes (optical fr ...
... In DFB lasers, the position of the grating relative to the output facets strongly influences the laser threshold and the optical spectrum. ϕ is the phase of the modulator output facet relative to the grating. The resolution of the complex oscillation condition (Eq. 4) gives the DFB modes (optical fr ...
Huge density-dependent blueshift of indirect excitons in biased
... optical switching require fast extinction. This is because we have used above-gap excitation in these experiments. It is therefore important in the future to perform a standard optical Stark shift experiment on this type of structure in which the pump laser is tuned to a photon energy below the indi ...
... optical switching require fast extinction. This is because we have used above-gap excitation in these experiments. It is therefore important in the future to perform a standard optical Stark shift experiment on this type of structure in which the pump laser is tuned to a photon energy below the indi ...
The Temperature Dependence Of The Gain In
... of the drive current, I, in many quantum well lasers. This relationship was expressedby McIlroy as G= Go in011/0 ...
... of the drive current, I, in many quantum well lasers. This relationship was expressedby McIlroy as G= Go in011/0 ...
Preprint
... for explorations of basic aspects of quantum mechanics. The second area could be labeled as “BEC as a new quantum fluid” or “BEC as a many-body system”. The focus here is on the interactions between the atoms which are most pronounced at high densities. Atom lasers and coherence In an ideal gas, Bos ...
... for explorations of basic aspects of quantum mechanics. The second area could be labeled as “BEC as a new quantum fluid” or “BEC as a many-body system”. The focus here is on the interactions between the atoms which are most pronounced at high densities. Atom lasers and coherence In an ideal gas, Bos ...
Laser pumping
Laser pumping is the act of energy transfer from an external source into the gain medium of a laser. The energy is absorbed in the medium, producing excited states in its atoms. When the number of particles in one excited state exceeds the number of particles in the ground state or a less-excited state, population inversion is achieved. In this condition, the mechanism of stimulated emission can take place and the medium can act as a laser or an optical amplifier. The pump power must be higher than the lasing threshold of the laser.The pump energy is usually provided in the form of light or electric current, but more exotic sources have been used, such as chemical or nuclear reactions.